Merge 8.7. Go back to lowercase for POSIX err-messages

20 files changed, 186 insertions, 186 deletions

diff --git a/tests/chanio.test b/tests/chanio.test
index 69a694e..d6a969a 100644
--- a/tests/chanio.test
+++ b/tests/chanio.test
@@ -2676,8 +2676,8 @@ test chan-io-29.27 {Tcl_Flush on chan closed pipeline} -setup {
     } else {
 	set x {this was supposed to fail and did not}
     }
-    set x
-} -match glob -result {1 {error flushing "*": Broken pipe} {POSIX EPIPE {Broken pipe}}}
+    string tolower $x
+} -match glob -result {1 {error flushing "*": broken pipe} {posix epipe {broken pipe}}}
 test chan-io-29.28 {Tcl_WriteChars, lf mode} -setup {
     file delete $path(test1)
 } -body {
@@ -4363,7 +4363,7 @@ test chan-io-34.8 {Tcl_Seek on pipes: not supported} -setup {
     chan seek $pipe 0 current
 } -returnCodes error -cleanup {
     chan close $pipe
-} -match glob -result {error during seek on "*": Invalid argument}
+} -match glob -result {error during seek on "*": invalid argument}
 test chan-io-34.9 {Tcl_Seek, testing buffered input flushing} -setup {
     file delete $path(test3)
 } -body {
@@ -5462,11 +5462,11 @@ test chan-io-40.10 {POSIX open access modes: RDONLY} -body {
 test chan-io-40.11 {POSIX open access modes: RDONLY} -match regexp -body {
     file delete $path(test3)
     open $path(test3) RDONLY
-} -returnCodes error -result {(?i)couldn't open ".*test3": No such file or directory}
+} -returnCodes error -result {(?i)couldn't open ".*test3": no such file or directory}
 test chan-io-40.12 {POSIX open access modes: WRONLY} -match regexp -body {
     file delete $path(test3)
     open $path(test3) WRONLY
-} -returnCodes error -result {(?i)couldn't open ".*test3": No such file or directory}
+} -returnCodes error -result {(?i)couldn't open ".*test3": no such file or directory}
 test chan-io-40.13 {POSIX open access modes: WRONLY} -body {
     makeFile xyzzy test3
     set f [open $path(test3) WRONLY]
@@ -5480,7 +5480,7 @@ test chan-io-40.13 {POSIX open access modes: WRONLY} -body {
 test chan-io-40.14 {POSIX open access modes: RDWR} -match regexp -body {
     file delete $path(test3)
     open $path(test3) RDWR
-} -returnCodes error -result {(?i)couldn't open ".*test3": No such file or directory}
+} -returnCodes error -result {(?i)couldn't open ".*test3": no such file or directory}
 test chan-io-40.15 {POSIX open access modes: RDWR} {
     makeFile xyzzy test3
     set f [open $path(test3) RDWR]
@@ -7585,7 +7585,7 @@ test chan-io-60.1 {writing illegal utf sequences} {fileevent testbytestring} {
     # cut of the remainder of the error stack, especially the filename
     set result [lreplace $result 3 3 [lindex [split [lindex $result 3] \n] 0]]
     list $x $result
-} {1 {gets {} catch {error writing "stdout": Invalid or incomplete multibyte or wide character}}}
+} {1 {gets {} catch {error writing "stdout": invalid or incomplete multibyte or wide character}}}
 
 test chan-io-61.1 {Reset eof state after changing the eof char} -setup {
     set datafile [makeFile {} eofchar]
diff --git a/tests/cmdAH.test b/tests/cmdAH.test
index a417e34..01a4a36 100644
--- a/tests/cmdAH.test
+++ b/tests/cmdAH.test
@@ -137,10 +137,10 @@ test cmdAH-2.5 {Tcl_CdObjCmd} -returnCodes error -body {
 } -result {user "~" doesn't exist}
 test cmdAH-2.6 {Tcl_CdObjCmd} -returnCodes error -body {
     cd _foobar
-} -result {couldn't change working directory to "_foobar": No such file or directory}
+} -result {couldn't change working directory to "_foobar": no such file or directory}
 test cmdAH-2.6.1 {Tcl_CdObjCmd} -returnCodes error -body {
     cd ""
-} -result {couldn't change working directory to "": No such file or directory}
+} -result {couldn't change working directory to "": no such file or directory}
 test cmdAH-2.6.2 {cd} -constraints {unix nonPortable} -setup {
     set dir [pwd]
 } -body {
@@ -1459,8 +1459,8 @@ test cmdAH-20.2 {Tcl_FileObjCmd: atime} -setup {
 	    [expr {[file atime $gorpfile] == $stat(atime)}]
 } -result {1 1}
 test cmdAH-20.3 {Tcl_FileObjCmd: atime} {
-    list [catch {file atime _bogus_} msg] $msg $errorCode
-} {1 {could not read "_bogus_": No such file or directory} {POSIX ENOENT {No such file or directory}}}
+    list [catch {file atime _bogus_} msg] [string tolower $msg] $errorCode
+} {1 {could not read "_bogus_": no such file or directory} {POSIX ENOENT {no such file or directory}}}
 test cmdAH-20.4 {Tcl_FileObjCmd: atime} -returnCodes error -body {
     file atime $file notint
 } -result {expected integer but got "notint"}
@@ -1525,7 +1525,7 @@ test cmdAH-22.3 {Tcl_FileObjCmd: isfile} {file isfile $dirfile} 0
 catch {file link -symbolic $linkfile $gorpfile}
 test cmdAH-23.1 {Tcl_FileObjCmd: lstat} -returnCodes error -body {
     file lstat a
-} -result {could not read "a": No such file or directory}
+} -result {could not read "a": no such file or directory}
 test cmdAH-23.2 {Tcl_FileObjCmd: lstat} -returnCodes error -body {
     file lstat a b c
 } -result {wrong # args: should be "file lstat name ?varName?"}
@@ -1542,9 +1542,9 @@ test cmdAH-23.4 {Tcl_FileObjCmd: lstat} -setup {
     list $stat(nlink) [expr {$stat(mode) & 0o777}] $stat(type)
 } -result {1 511 link}
 test cmdAH-23.5 {Tcl_FileObjCmd: lstat errors} {nonPortable} {
-    list [catch {file lstat _bogus_ stat} msg] $msg \
+    list [catch {file lstat _bogus_ stat} msg] [string tolower $msg] \
 	$errorCode
-} {1 {could not read "_bogus_": No such file or directory} {POSIX ENOENT {No such file or directory}}}
+} {1 {could not read "_bogus_": no such file or directory} {POSIX ENOENT {no such file or directory}}}
 test cmdAH-23.6 {Tcl_FileObjCmd: lstat errors} -setup {
     unset -nocomplain x
 } -body {
@@ -1634,8 +1634,8 @@ test cmdAH-24.3 {Tcl_FileObjCmd: mtime} -setup {
 	    [expr {[file atime $gorpfile] == $stat(atime)}]
 } -result {1 1}
 test cmdAH-24.4 {Tcl_FileObjCmd: mtime} {
-    list [catch {file mtime _bogus_} msg] $msg $errorCode
-} {1 {could not read "_bogus_": No such file or directory} {POSIX ENOENT {No such file or directory}}}
+    list [catch {file mtime _bogus_} msg] [string tolower $msg] $errorCode
+} {1 {could not read "_bogus_": no such file or directory} {POSIX ENOENT {no such file or directory}}}
 test cmdAH-24.5 {Tcl_FileObjCmd: mtime} -setup {
     # Under Unix, use a file in /tmp to avoid clock skew due to NFS. On other
     # platforms, just use a file in the local directory.
@@ -1814,11 +1814,11 @@ test cmdAH-26.2 {Tcl_FileObjCmd: readlink} {unix nonPortable} {
     file readlink $linkfile
 } $gorpfile
 test cmdAH-26.3 {Tcl_FileObjCmd: readlink errors} {unix nonPortable} {
-    list [catch {file readlink _bogus_} msg] $msg $errorCode
-} {1 {could not readlink "_bogus_": No such file or directory} {POSIX ENOENT {No such file or directory}}}
+    list [catch {file readlink _bogus_} msg] [string tolower $msg] $errorCode
+} {1 {could not readlink "_bogus_": no such file or directory} {POSIX ENOENT {no such file or directory}}}
 test cmdAH-26.5 {Tcl_FileObjCmd: readlink errors} {win nonPortable} {
-    list [catch {file readlink _bogus_} msg] $msg $errorCode
-} {1 {could not readlink "_bogus_": Invalid argument} {POSIX EINVAL {Invalid argument}}}
+    list [catch {file readlink _bogus_} msg] [string tolower $msg] $errorCode
+} {1 {could not readlink "_bogus_": invalid argument} {POSIX EINVAL {invalid argument}}}
 
 # size
 test cmdAH-27.1 {Tcl_FileObjCmd: size} -returnCodes error -body {
@@ -1833,8 +1833,8 @@ test cmdAH-27.2 {Tcl_FileObjCmd: size} {
     expr {[file size $gorpfile] - $oldsize}
 } {10}
 test cmdAH-27.3 {Tcl_FileObjCmd: size} {
-    list [catch {file size _bogus_} msg] $msg $errorCode
-} {1 {could not read "_bogus_": No such file or directory} {POSIX ENOENT {No such file or directory}}}
+    list [catch {file size _bogus_} msg] [string tolower $msg] $errorCode
+} {1 {could not read "_bogus_": no such file or directory} {POSIX ENOENT {no such file or directory}}}
 test cmdAH-27.4 {
     Tcl_FileObjCmd: size (built-in Windows names)
 } -constraints {win} -body {
@@ -1884,8 +1884,8 @@ test cmdAH-28.5 {Tcl_FileObjCmd: stat} -constraints {unix notWsl} -setup {
     format 0o%03o [expr {$stat(mode) & 0o777}]
 } -result 0o765
 test cmdAH-28.6 {Tcl_FileObjCmd: stat} {
-    list [catch {file stat _bogus_ stat} msg] $msg $errorCode
-} {1 {could not read "_bogus_": No such file or directory} {POSIX ENOENT {No such file or directory}}}
+    list [catch {file stat _bogus_ stat} msg] [string tolower $msg] $errorCode
+} {1 {could not read "_bogus_": no such file or directory} {POSIX ENOENT {no such file or directory}}}
 test cmdAH-28.7 {Tcl_FileObjCmd: stat} -setup {
     unset -nocomplain x
 } -returnCodes error -body {
@@ -2006,8 +2006,8 @@ test cmdAH-29.4.1 {Tcl_FileObjCmd: type} -constraints {linkDirectory notWine} -s
     removeDirectory $tempdir
 } -result link
 test cmdAH-29.5 {Tcl_FileObjCmd: type} {
-    list [catch {file type _bogus_} msg] $msg $errorCode
-} {1 {could not read "_bogus_": No such file or directory} {POSIX ENOENT {No such file or directory}}}
+    list [catch {file type _bogus_} msg] [string tolower $msg] $errorCode
+} {1 {could not read "_bogus_": no such file or directory} {POSIX ENOENT {no such file or directory}}}
 test cmdAH-29.6 {
     Tcl_FileObjCmd: type (built-in Windows names)
 } -constraints {win} -body {
@@ -2206,7 +2206,7 @@ test cmdAH-33.6 {file tempdir: missing parent dir} -setup {
     file tempdir $base/quux/
 } -cleanup {
     catch {file delete -force $base}
-} -result {can't create temporary directory: No such file or directory}
+} -result {can't create temporary directory: no such file or directory}
 test cmdAH-33.7 {file tempdir: missing parent dir} -setup {
     set base [file join [temporaryDirectory] gorp]
     file mkdir $base
@@ -2214,7 +2214,7 @@ test cmdAH-33.7 {file tempdir: missing parent dir} -setup {
     file tempdir $base/quux/foobar
 } -cleanup {
     catch {file delete -force $base}
-} -result {can't create temporary directory: No such file or directory}
+} -result {can't create temporary directory: no such file or directory}
 
 # This shouldn't work, but just in case a test above failed...
 catch {close $newFileId}
diff --git a/tests/cmdMZ.test b/tests/cmdMZ.test
index 27ec3bf..a7aa36c 100644
--- a/tests/cmdMZ.test
+++ b/tests/cmdMZ.test
@@ -64,7 +64,7 @@ test cmdMZ-1.4 {Tcl_PwdObjCmd: failure} -setup {
 } -returnCodes error -cleanup {
     cd $cwd
     file delete -force $foodir
-} -result {error getting working directory name: Permission denied}
+} -result {error getting working directory name: permission denied}
 
 # The tests for Tcl_RegexpObjCmd, Tcl_RegsubObjCmd are in regexp.test
 
diff --git a/tests/event.test b/tests/event.test
index 163a6f9..16cbc24 100644
--- a/tests/event.test
+++ b/tests/event.test
@@ -184,10 +184,10 @@ test event-5.1 {Tcl_BackgroundError, HandleBgErrors procedures} -setup {
 } -result {{{a simple error} {a simple error
     while executing
 "error "a simple error""
-    ("after" script)} NONE} {{couldn't open "non_existent": No such file or directory} {couldn't open "non_existent": No such file or directory
+    ("after" script)} NONE} {{couldn't open "non_existent": no such file or directory} {couldn't open "non_existent": no such file or directory
     while executing
 "open non_existent"
-    ("after" script)} {POSIX ENOENT {No such file or directory}}}}
+    ("after" script)} {POSIX ENOENT {no such file or directory}}}}
 test event-5.2 {Tcl_BackgroundError, HandleBgErrors procedures} -setup {
     catch {rename bgerror {}}
 } -body {
diff --git a/tests/exec.test b/tests/exec.test
index 888042e..d1ef418 100644
--- a/tests/exec.test
+++ b/tests/exec.test
@@ -333,11 +333,11 @@ test exec-8.2 {long input and output} {exec} {
 
 test exec-9.1 {commands returning errors} {exec notValgrind} {
     set x [catch {exec gorp456} msg]
-    list $x $msg $errorCode
-} {1 {couldn't execute "gorp456": No such file or directory} {POSIX ENOENT {No such file or directory}}}
+    list $x [string tolower $msg] [string tolower $errorCode]
+} {1 {couldn't execute "gorp456": no such file or directory} {posix enoent {no such file or directory}}}
 test exec-9.2 {commands returning errors} {exec notValgrind} {
-    list [catch {exec [interpreter] echo foo | foo123} msg] $msg $errorCode
-} {1 {couldn't execute "foo123": No such file or directory} {POSIX ENOENT {No such file or directory}}}
+    string tolower [list [catch {exec [interpreter] echo foo | foo123} msg] $msg $errorCode]
+} {1 {couldn't execute "foo123": no such file or directory} {posix enoent {no such file or directory}}}
 test exec-9.3 {commands returning errors} -constraints {exec stdio} -body {
     exec [interpreter] $path(sleep) 1 | [interpreter] $path(exit) 43 | [interpreter] $path(sleep) 1
 } -returnCodes error -result {child process exited abnormally}
@@ -347,7 +347,7 @@ test exec-9.4 {commands returning errors} -constraints {exec stdio} -body {
 child process exited abnormally}
 test exec-9.5 {commands returning errors} -constraints {exec stdio notValgrind} -body {
     exec gorp456 | [interpreter] echo a b c
-} -returnCodes error -result {couldn't execute "gorp456": No such file or directory}
+} -returnCodes error -result {couldn't execute "gorp456": no such file or directory}
 test exec-9.6 {commands returning errors} -constraints {exec} -body {
     exec [interpreter] $path(sh) -c "\"$path(echo)\" error msg 1>&2"
 } -returnCodes error -result {error msg}
@@ -417,13 +417,13 @@ test exec-10.14 {errors in exec invocation} -constraints {exec} -body {
 } -returnCodes error -result {can't specify "<@" as last word in command}
 test exec-10.15 {errors in exec invocation} -constraints {exec} -body {
     exec cat < a/b/c
-} -returnCodes error -result {couldn't read file "a/b/c": No such file or directory}
+} -returnCodes error -result {couldn't read file "a/b/c": no such file or directory}
 test exec-10.16 {errors in exec invocation} -constraints {exec} -body {
     exec cat << foo > a/b/c
-} -returnCodes error -result {couldn't write file "a/b/c": No such file or directory}
+} -returnCodes error -result {couldn't write file "a/b/c": no such file or directory}
 test exec-10.17 {errors in exec invocation} -constraints {exec} -body {
     exec cat << foo > a/b/c
-} -returnCodes error -result {couldn't write file "a/b/c": No such file or directory}
+} -returnCodes error -result {couldn't write file "a/b/c": no such file or directory}
 set f [open $path(gorp.file) w]
 test exec-10.18 {errors in exec invocation} -constraints {exec} -body {
     exec cat <@ $f
@@ -511,16 +511,16 @@ test exec-12.3 {reaping background processes} {exec unix nonPortable} {
 # Make sure "errorCode" is set correctly.
 
 test exec-13.1 {setting errorCode variable} {exec} {
-    list [catch {exec [interpreter] $path(cat) < a/b/c} msg] $errorCode
-} {1 {POSIX ENOENT {No such file or directory}}}
+    list [catch {exec [interpreter] $path(cat) < a/b/c} msg] [string tolower $errorCode]
+} {1 {posix enoent {no such file or directory}}}
 test exec-13.2 {setting errorCode variable} {exec} {
-    list [catch {exec [interpreter] $path(cat) > a/b/c} msg] $errorCode
-} {1 {POSIX ENOENT {No such file or directory}}}
+    list [catch {exec [interpreter] $path(cat) > a/b/c} msg] [string tolower $errorCode]
+} {1 {posix enoent {no such file or directory}}}
 test exec-13.3 {setting errorCode variable} {exec notValgrind} {
     set x [catch {exec _weird_cmd_} msg]
-    list $x $msg [lindex $errorCode 0] \
-	    [lrange $errorCode 2 end]
-} {1 {couldn't execute "_weird_cmd_": No such file or directory} POSIX {{No such file or directory}}}
+    list $x [string tolower $msg] [lindex $errorCode 0] \
+	    [string tolower [lrange $errorCode 2 end]]
+} {1 {couldn't execute "_weird_cmd_": no such file or directory} POSIX {{no such file or directory}}}
 test exec-13.4 {extended exit result codes} -setup {
     set tmp [makeFile {exit 0x00000101} tmpfile.exec-13.4]
 } -constraints {win} -body {
@@ -556,7 +556,7 @@ test exec-14.3 {unknown switch} -constraints {exec} -body {
 } -returnCodes error -result {bad option "-gorp": must be -ignorestderr, -keepnewline, or --}
 test exec-14.4 {-- switch} -constraints {exec notValgrind} -body {
     exec -- -gorp
-} -returnCodes error -result {couldn't execute "-gorp": No such file or directory}
+} -returnCodes error -result {couldn't execute "-gorp": no such file or directory}
 test exec-14.5 {-ignorestderr switch} {exec} {
     # Alas, the use of -ignorestderr is buried here :-(
     exec [interpreter] $path(sh2) -c [list $path(echo2) foo bar] 2>@1
diff --git a/tests/fCmd.test b/tests/fCmd.test
index 9c4ba21..3476895 100644
--- a/tests/fCmd.test
+++ b/tests/fCmd.test
@@ -246,7 +246,7 @@ test fCmd-3.4 {FileCopyRename: Tcl_TranslateFileName passes} -setup {
     cleanup
 } -constraints {notRoot} -returnCodes error -body {
     file copy tf1 ~
-} -result {error copying "tf1": No such file or directory}
+} -result {error copying "tf1": no such file or directory}
 test fCmd-3.5 {FileCopyRename: target doesn't exist: stat(target) != 0} -setup {
     cleanup
 } -constraints {notRoot} -returnCodes error -body {
@@ -321,7 +321,7 @@ test fCmd-3.15 {FileCopyRename: source[0] == '\x00'} -setup {
 } -constraints {notRoot unixOrWin} -returnCodes error -body {
     file mkdir td1
     file rename / td1
-} -result {error renaming "/" to "td1": File exists}
+} -result {error renaming "/" to "td1": file exists}
 test fCmd-3.16 {FileCopyRename: break on first error} -setup {
     cleanup
 } -constraints {notRoot} -returnCodes error -body {
@@ -332,7 +332,7 @@ test fCmd-3.16 {FileCopyRename: break on first error} -setup {
     file mkdir td1
     createfile [file join td1 tf3]
     file rename tf1 tf2 tf3 tf4 td1
-} -result [subst {error renaming "tf3" to "[file join td1 tf3]": File exists}]
+} -result [subst {error renaming "tf3" to "[file join td1 tf3]": file exists}]
 
 test fCmd-4.1 {TclFileMakeDirsCmd: make each dir: 1 dir} -setup {
     cleanup
@@ -362,7 +362,7 @@ test fCmd-4.5 {TclFileMakeDirsCmd: Tcl_SplitPath returns 0: *name == '\x00'} -se
     cleanup
 } -constraints {notRoot} -returnCodes error -body {
     file mkdir ""
-} -result {can't create directory "": No such file or directory}
+} -result {can't create directory "": no such file or directory}
 test fCmd-4.6 {TclFileMakeDirsCmd: one level deep} -setup {
     cleanup
 } -constraints {notRoot} -body {
@@ -388,7 +388,7 @@ test fCmd-4.9 {TclFileMakeDirsCmd: exists, not dir} -setup {
 } -constraints {notRoot} -returnCodes error -body {
     createfile tf1
     file mkdir tf1
-} -result [subst {can't create directory "[file join tf1]": File exists}]
+} -result [subst {can't create directory "[file join tf1]": file exists}]
 test fCmd-4.10 {TclFileMakeDirsCmd: exists, is dir} -setup {
     cleanup
 } -constraints {notRoot} -body {
@@ -406,7 +406,7 @@ test fCmd-4.11 {TclFileMakeDirsCmd: doesn't exist: errno != ENOENT} -setup {
 } -cleanup {
     testchmod 0o755 td1/td2
     cleanup
-} -result {can't create directory "td1/td2/td3": Permission denied}
+} -result {can't create directory "td1/td2/td3": permission denied}
 test fCmd-4.13 {TclFileMakeDirsCmd: doesn't exist: errno == ENOENT} -setup {
     cleanup
 } -constraints {notRoot} -body {
@@ -423,7 +423,7 @@ test fCmd-4.14 {TclFileMakeDirsCmd: TclpCreateDirectory fails} -setup {
     file mkdir foo/tf1
 } -returnCodes error -cleanup {
     file delete -force foo
-} -result {can't create directory "foo/tf1": Permission denied}
+} -result {can't create directory "foo/tf1": permission denied}
 test fCmd-4.16 {TclFileMakeDirsCmd: TclpCreateDirectory succeeds} -setup {
     cleanup
 } -constraints {notRoot} -body {
@@ -525,7 +525,7 @@ test fCmd-6.3 {CopyRenameOneFile: lstat(source) != 0} -setup {
     cleanup
 } -constraints {notRoot} -returnCodes error -body {
     file rename tf1 tf2
-} -result {error renaming "tf1": No such file or directory}
+} -result {error renaming "tf1": no such file or directory}
 test fCmd-6.4 {CopyRenameOneFile: lstat(source) == 0} -setup {
     cleanup
 } -constraints {notRoot} -body {
@@ -549,7 +549,7 @@ test fCmd-6.6 {CopyRenameOneFile: errno != ENOENT} -setup {
     file rename tf1 td1
 } -returnCodes error -cleanup {
     testchmod 0o755 td1
-} -result {error renaming "tf1" to "td1/tf1": Permission denied}
+} -result {error renaming "tf1" to "td1/tf1": permission denied}
 test fCmd-6.9 {CopyRenameOneFile: errno == ENOENT} -setup {
     cleanup
 } -constraints {unix notRoot} -body {
@@ -563,14 +563,14 @@ test fCmd-6.10 {CopyRenameOneFile: lstat(target) == 0} -setup {
     createfile tf1
     createfile tf2
     file rename tf1 tf2
-} -result {error renaming "tf1" to "tf2": File exists}
+} -result {error renaming "tf1" to "tf2": file exists}
 test fCmd-6.11 {CopyRenameOneFile: force == 0} -setup {
     cleanup
 } -constraints {notRoot} -returnCodes error -body {
     createfile tf1
     createfile tf2
     file rename tf1 tf2
-} -result {error renaming "tf1" to "tf2": File exists}
+} -result {error renaming "tf1" to "tf2": file exists}
 test fCmd-6.12 {CopyRenameOneFile: force != 0} -setup {
     cleanup
 } -constraints {notRoot} -body {
@@ -668,7 +668,7 @@ test fCmd-6.23 {CopyRenameOneFile: TclpCopyDirectory failed} -setup {
 } -returnCodes error -cleanup {
     file attributes td1 -permissions 0o755
     cleanup
-} -match regexp -result {^error renaming "td1"( to "/tmp/tcl\d+/td1")?: Permission denied$}
+} -match regexp -result {^error renaming "td1"( to "/tmp/tcl\d+/td1")?: permission denied$}
 test fCmd-6.24 {CopyRenameOneFile: error uses original name} -setup {
     cleanup
 } -constraints {unix notRoot} -body {
@@ -679,7 +679,7 @@ test fCmd-6.24 {CopyRenameOneFile: error uses original name} -setup {
 } -returnCodes error -cleanup {
     file attributes $td1name -permissions 0o755
     file delete -force ~/td1
-} -result {error copying "~/td1": Permission denied}
+} -result {error copying "~/td1": permission denied}
 test fCmd-6.25 {CopyRenameOneFile: error uses original name} -setup {
     cleanup
 } -constraints {unix notRoot} -body {
@@ -691,7 +691,7 @@ test fCmd-6.25 {CopyRenameOneFile: error uses original name} -setup {
 } -returnCodes error -cleanup {
     file attributes $td1name -permissions 0o755
     file delete -force ~/td1
-} -result {error copying "td2" to "~/td1/td2": Permission denied}
+} -result {error copying "td2" to "~/td1/td2": permission denied}
 test fCmd-6.26 {CopyRenameOneFile: doesn't use original name} -setup {
     cleanup
 } -constraints {unix notRoot} -body {
@@ -702,7 +702,7 @@ test fCmd-6.26 {CopyRenameOneFile: doesn't use original name} -setup {
 } -returnCodes error -cleanup {
     file attributes $td2name -permissions 0o755
     file delete -force ~/td1
-} -result "error copying \"~/td1\" to \"td1\": \"[file join $::env(HOME) td1 td2]\": Permission denied"
+} -result "error copying \"~/td1\" to \"td1\": \"[file join $::env(HOME) td1 td2]\": permission denied"
 test fCmd-6.27 {CopyRenameOneFile: TclpCopyDirectory failed} -setup {
     cleanup $tmpspace
 } -constraints {notRoot xdev} -returnCodes error -body {
@@ -710,7 +710,7 @@ test fCmd-6.27 {CopyRenameOneFile: TclpCopyDirectory failed} -setup {
     file mkdir [file join $tmpspace td1]
     createfile [file join $tmpspace td1 tf1]
     file rename -force td1 $tmpspace
-} -match glob -result {error renaming "td1" to "/tmp/tcl*/td1": File exists}
+} -match glob -result {error renaming "td1" to "/tmp/tcl*/td1": file exists}
 test fCmd-6.28 {CopyRenameOneFile: TclpCopyDirectory failed} -setup {
     cleanup $tmpspace
 } -constraints {notRoot xdev notWsl} -body {
@@ -720,7 +720,7 @@ test fCmd-6.28 {CopyRenameOneFile: TclpCopyDirectory failed} -setup {
 } -returnCodes error -cleanup {
     file attributes td1/td2/td3 -permissions 0o755
     cleanup $tmpspace
-} -match glob -result {error renaming "td1" to "/tmp/tcl*/td1": "td1/td2/td3": Permission denied}
+} -match glob -result {error renaming "td1" to "/tmp/tcl*/td1": "td1/td2/td3": permission denied}
 test fCmd-6.29 {CopyRenameOneFile: TclpCopyDirectory passed} -setup {
     cleanup $tmpspace
 } -constraints {notRoot xdev} -body {
@@ -738,7 +738,7 @@ test fCmd-6.30 {CopyRenameOneFile: TclpRemoveDirectory failed} -setup {
     catch {file delete [file join $tmpspace bar]}
     catch {file attr foo -perm 0o40777}
     catch {file delete -force foo}
-} -match glob -result {*: Permission denied}
+} -match glob -result {*: permission denied}
 test fCmd-6.31 {CopyRenameOneFile: TclpDeleteFile passed} -setup {
     cleanup $tmpspace
 } -constraints {notRoot xdev} -body {
@@ -751,7 +751,7 @@ test fCmd-6.32 {CopyRenameOneFile: copy} -constraints {notRoot} -setup {
     cleanup
 } -returnCodes error -body {
     file copy tf1 tf2
-} -result {error copying "tf1": No such file or directory}
+} -result {error copying "tf1": no such file or directory}
 
 test fCmd-7.1 {FileForceOption: none} -constraints {notRoot} -setup {
     cleanup
@@ -793,7 +793,7 @@ test fCmd-8.1 {FileBasename: basename of ~user: argc == 1 && *path == ~} \
     file rename ~$user td1
 } -returnCodes error -cleanup {
     file delete -force td1
-} -result "error renaming \"~$user\" to \"td1/[file tail ~$user]\": Permission denied"
+} -result "error renaming \"~$user\" to \"td1/[file tail ~$user]\": permission denied"
 test fCmd-8.2 {FileBasename: basename of ~user: argc == 1 && *path == ~} \
 	-constraints {unix notRoot} -body {
     string equal [file tail ~$user] ~$user
@@ -801,7 +801,7 @@ test fCmd-8.2 {FileBasename: basename of ~user: argc == 1 && *path == ~} \
 test fCmd-8.3 {file copy and path translation: ensure correct error} -body {
     file copy ~ [file join this file doesnt exist]
 } -returnCodes error -result [subst \
-	{error copying "~" to "[file join this file doesnt exist]": No such file or directory}]
+	{error copying "~" to "[file join this file doesnt exist]": no such file or directory}]
 
 test fCmd-9.1 {file rename: comprehensive: EACCES} -setup {
     cleanup
@@ -813,12 +813,12 @@ test fCmd-9.1 {file rename: comprehensive: EACCES} -setup {
 } -returnCodes error -cleanup {
     file delete -force td2
     file delete -force td1
-} -result {error renaming "td1" to "td2/td1": Permission denied}
+} -result {error renaming "td1" to "td2/td1": permission denied}
 test fCmd-9.2 {file rename: comprehensive: source doesn't exist} -setup {
     cleanup
 } -constraints {notRoot} -returnCodes error -body {
     file rename tf1 tf2
-} -result {error renaming "tf1": No such file or directory}
+} -result {error renaming "tf1": no such file or directory}
 test fCmd-9.3 {file rename: comprehensive: file to new name} -setup {
     cleanup
 } -constraints {notRoot testchmod} -body {
@@ -883,7 +883,7 @@ test fCmd-9.7 {file rename: comprehensive: file to existing file} -setup {
     file rename -force tfs3 tfd3
     file rename -force tfs4 tfd4
     list [lsort [glob tf*]] $msg [file writable tfd1] [file writable tfd2] [file writable tfd3] [file writable tfd4]
-} -result {{tf1 tf2 tfd1 tfd2 tfd3 tfd4} {1 {error renaming "tf1" to "tf2": File exists}} 1 1 0 0}
+} -result {{tf1 tf2 tfd1 tfd2 tfd3 tfd4} {1 {error renaming "tf1" to "tf2": file exists}} 1 1 0 0}
 test fCmd-9.8 {file rename: comprehensive: dir to empty dir} -setup {
     cleanup
 } -constraints {notRoot testchmod notNetworkFilesystem} -body {
@@ -919,7 +919,7 @@ test fCmd-9.8 {file rename: comprehensive: dir to empty dir} -setup {
     }
     list [lsort [glob td*]] $msg [file writable [file join tdd1 tds1]] \
     [file writable [file join tdd2 tds2]] $w3 $w4
-} -result [subst {{td1 td2 tdd1 tdd2 tdd3 tdd4} {1 {error renaming "td1" to "[file join td2 td1]": File exists}} 1 1 0 0}]
+} -result [subst {{td1 td2 tdd1 tdd2 tdd3 tdd4} {1 {error renaming "td1" to "[file join td2 td1]": file exists}} 1 1 0 0}]
 # Test can hit EEXIST or EBUSY, depending on underlying filesystem
 test fCmd-9.9 {file rename: comprehensive: dir to non-empty dir} -setup {
     cleanup
@@ -969,7 +969,7 @@ test fCmd-9.12 {file rename: comprehensive: target exists} -setup {
 	[catch {file rename td1 td2} msg] $msg
 } -cleanup {
     testchmod 0o755 [file join td2 td1]
-} -result [subst {0 1 1 {error renaming "td1" to "[file join td2 td1]": File exists}}]
+} -result [subst {0 1 1 {error renaming "td1" to "[file join td2 td1]": file exists}}]
 # Test can hit EEXIST or EBUSY, depending on underlying filesystem
 test fCmd-9.13 {file rename: comprehensive: can't overwrite target} -setup {
     cleanup
@@ -1001,7 +1001,7 @@ test fCmd-9.14.2 {file rename: comprehensive: dir into self} -setup {
     file rename [file join .. td1] [file join .. td1x]
 } -returnCodes error -cleanup {
     cd $dir
-} -result [subst {error renaming "[file join .. td1]" to "[file join .. td1x]": Permission denied}]
+} -result [subst {error renaming "[file join .. td1]" to "[file join .. td1x]": permission denied}]
 test fCmd-9.14.3 {file rename: comprehensive: dir into self} -setup {
     cleanup
     set dir [pwd]
@@ -1033,7 +1033,7 @@ test fCmd-10.1 {file copy: comprehensive: source doesn't exist} -setup {
     cleanup
 } -constraints {notRoot} -returnCodes error -body {
     file copy tf1 tf2
-} -result {error copying "tf1": No such file or directory}
+} -result {error copying "tf1": no such file or directory}
 test fCmd-10.2 {file copy: comprehensive: file to new name} -setup {
     cleanup
 } -constraints {notRoot testchmod} -body {
@@ -1106,7 +1106,7 @@ test fCmd-10.4 {file copy: comprehensive: file to existing file} -setup {
     file copy -force tfs3 tfd3
     file copy -force tfs4 tfd4
     list [lsort [glob tf*]] $msg [file writable tfd1] [file writable tfd2] [file writable tfd3] [file writable tfd4]
-} -result {{tf1 tf2 tfd1 tfd2 tfd3 tfd4 tfs1 tfs2 tfs3 tfs4} {1 {error copying "tf1" to "tf2": File exists}} 1 1 0 0}
+} -result {{tf1 tf2 tfd1 tfd2 tfd3 tfd4 tfs1 tfs2 tfs3 tfs4} {1 {error copying "tf1" to "tf2": file exists}} 1 1 0 0}
 test fCmd-10.5 {file copy: comprehensive: dir to empty dir} -setup {
     cleanup
 } -constraints {notRoot testchmod} -body {
@@ -1130,7 +1130,7 @@ test fCmd-10.5 {file copy: comprehensive: dir to empty dir} -setup {
     set a4 [catch {file copy -force tds3 tdd3}]
     set a5 [catch {file copy -force tds4 tdd4}]
     list [lsort [glob td*]] $a1 $a2 $a3 $a4 $a5
-} -result [subst {{td1 td2 tdd1 tdd2 tdd3 tdd4 tds1 tds2 tds3 tds4} {1 {error copying "td1" to "[file join td2 td1]": File exists}} {1 {error copying "tds1" to "[file join tdd1 tds1]": File exists}} 1 1 1}]
+} -result [subst {{td1 td2 tdd1 tdd2 tdd3 tdd4 tds1 tds2 tds3 tds4} {1 {error copying "td1" to "[file join td2 td1]": file exists}} {1 {error copying "tds1" to "[file join tdd1 tds1]": file exists}} 1 1 1}]
 test fCmd-10.6 {file copy: comprehensive: dir to non-empty dir} -setup {
     cleanup
 } -constraints {notRoot unixOrWin testchmod notWsl} -body {
@@ -1142,7 +1142,7 @@ test fCmd-10.6 {file copy: comprehensive: dir to non-empty dir} -setup {
     set a1 [list [catch {file copy -force tds1 tdd1} msg] $msg]
     set a2 [list [catch {file copy -force tds2 tdd2} msg] $msg]
     list [lsort [glob td*]] $a1 $a2 [file writable tds1] [file writable tds2]
-} -result [subst {{tdd1 tdd2 tds1 tds2} {1 {error copying "tds1" to "[file join tdd1 tds1]": File exists}} {1 {error copying "tds2" to "[file join tdd2 tds2]": File exists}} 1 0}]
+} -result [subst {{tdd1 tdd2 tds1 tds2} {1 {error copying "tds1" to "[file join tdd1 tds1]": file exists}} {1 {error copying "tds2" to "[file join tdd2 tds2]": file exists}} 1 0}]
 test fCmd-10.7 {file rename: comprehensive: file to new name and dir} -setup {
     cleanup
 } -constraints {notRoot testchmod} -body {
@@ -1199,13 +1199,13 @@ test fCmd-10.11 {file copy: copy to empty file name} -setup {
 } -returnCodes error -body {
     createfile tf1
     file copy tf1 ""
-} -result {error copying "tf1" to "": No such file or directory}
+} -result {error copying "tf1" to "": no such file or directory}
 test fCmd-10.12 {file rename: rename to empty file name} -setup {
     cleanup
 } -returnCodes error -body {
     createfile tf1
     file rename tf1 ""
-} -result {error renaming "tf1" to "": No such file or directory}
+} -result {error renaming "tf1" to "": no such file or directory}
 cleanup
 
 # old tests
@@ -2354,21 +2354,21 @@ test fCmd-28.5 {file link: source already exists} -setup {
     file link abc.dir abc2.dir
 } -returnCodes error -cleanup {
     cd [workingDirectory]
-} -result {could not create new link "abc.dir": File exists}
+} -result {could not create new link "abc.dir": that path already exists}
 test fCmd-28.6 {file link: unsupported operation} -setup {
     cd [temporaryDirectory]
 } -constraints {linkDirectory win} -body {
     file link -hard abc.link abc.dir
 } -returnCodes error -cleanup {
     cd [workingDirectory]
-} -result {could not create new link "abc.link" pointing to "abc.dir": Is a directory}
+} -result {could not create new link "abc.link" pointing to "abc.dir": is a directory}
 test fCmd-28.7 {file link: source already exists} -setup {
     cd [temporaryDirectory]
 } -constraints {linkFile} -body {
     file link abc.file abc2.file
 } -returnCodes error -cleanup {
     cd [workingDirectory]
-} -result {could not create new link "abc.file": File exists}
+} -result {could not create new link "abc.file": that path already exists}
 # In Windows 10 developer mode, we _can_ create symbolic links to files!
 test fCmd-28.8 {file link} -constraints {linkFile winLessThan10} -setup {
     cd [temporaryDirectory]
@@ -2377,7 +2377,7 @@ test fCmd-28.8 {file link} -constraints {linkFile winLessThan10} -setup {
 } -cleanup {
     file delete -force abc.link
     cd [workingDirectory]
-} -returnCodes error -result {could not create new link "abc.link" pointing to "abc.file": Invalid argument}
+} -returnCodes error -result {could not create new link "abc.link" pointing to "abc.file": invalid argument}
 test fCmd-28.9 {file link: success with file} -constraints {linkFile} -setup {
     cd [temporaryDirectory]
     file delete -force abc.link
@@ -2416,7 +2416,7 @@ test fCmd-28.10.1 {file link: linking to nonexistent path} -setup {
     file link doesnt/abc.link abc.dir
 } -returnCodes error -cleanup {
     cd [workingDirectory]
-} -result {could not create new link "doesnt/abc.link": No such file or directory}
+} -result {could not create new link "doesnt/abc.link": no such file or directory}
 test fCmd-28.11 {file link: success with directory} -setup {
     cd [temporaryDirectory]
     file delete -force abc.link
@@ -2463,7 +2463,7 @@ test fCmd-28.13 {file link} -constraints {linkDirectory notWine} -setup {
 } -returnCodes error -cleanup {
     file delete -force abc.link
     cd [workingDirectory]
-} -result {could not create new link "abc.link": File exists}
+} -result {could not create new link "abc.link": that path already exists}
 test fCmd-28.14 {file link: deletes link not dir} -setup {
     cd [temporaryDirectory]
 } -constraints {linkDirectory} -body {
diff --git a/tests/fileName.test b/tests/fileName.test
index d16f86e..09662ff 100644
--- a/tests/fileName.test
+++ b/tests/fileName.test
@@ -1332,8 +1332,8 @@ unset globname
 
 catch {file attributes globTest/a1 -permissions 0}
 test filename-15.1 {unix specific globbing} {unix nonPortable} {
-    list [catch {glob globTest/a1/*} msg] $msg $errorCode
-} {1 {couldn't read directory "globtest/a1": Permission denied} {POSIX EACCES {Permission denied}}}
+    string tolower [list [catch {glob globTest/a1/*} msg] $msg $errorCode]
+} {1 {couldn't read directory "globtest/a1": permission denied} {posix eacces {permission denied}}}
 test filename-15.2 {unix specific no complain: no errors} {unix nonPortable} {
     glob -nocomplain globTest/a1/*
 } {}
diff --git a/tests/fileSystem.test b/tests/fileSystem.test
index 40746be..003bf40 100644
--- a/tests/fileSystem.test
+++ b/tests/fileSystem.test
@@ -498,19 +498,19 @@ test filesystem-5.1 {cache and ~} -constraints testfilesystem -setup {
 
 test filesystem-6.1 {empty file name} -returnCodes error -body {
     open ""
-} -result {couldn't open "": No such file or directory}
+} -result {couldn't open "": no such file or directory}
 test filesystem-6.2 {empty file name} -returnCodes error -body {
     file stat "" arr
-} -result {could not read "": No such file or directory}
+} -result {could not read "": no such file or directory}
 test filesystem-6.3 {empty file name} -returnCodes error -body {
     file atime ""
-} -result {could not read "": No such file or directory}
+} -result {could not read "": no such file or directory}
 test filesystem-6.4 {empty file name} -returnCodes error -body {
     file attributes ""
-} -result {could not read "": No such file or directory}
+} -result {could not read "": no such file or directory}
 test filesystem-6.5 {empty file name} -returnCodes error -body {
     file copy "" ""
-} -result {error copying "": No such file or directory}
+} -result {error copying "": no such file or directory}
 test filesystem-6.6 {empty file name} {file delete ""} {}
 test filesystem-6.7 {empty file name} {file dirname ""} .
 test filesystem-6.8 {empty file name} {file executable ""} 0
@@ -521,19 +521,19 @@ test filesystem-6.12 {empty file name} {file isfile ""} 0
 test filesystem-6.13 {empty file name} {file join ""} {}
 test filesystem-6.14 {empty file name} -returnCodes error -body {
     file link ""
-} -result {could not read link "": No such file or directory}
+} -result {could not read link "": no such file or directory}
 test filesystem-6.15 {empty file name} -returnCodes error -body {
     file lstat "" arr
-} -result {could not read "": No such file or directory}
+} -result {could not read "": no such file or directory}
 test filesystem-6.16 {empty file name} -returnCodes error -body {
     file mtime ""
-} -result {could not read "": No such file or directory}
+} -result {could not read "": no such file or directory}
 test filesystem-6.17 {empty file name} -returnCodes error -body {
     file mtime "" 0
-} -result {could not read "": No such file or directory}
+} -result {could not read "": no such file or directory}
 test filesystem-6.18 {empty file name} -returnCodes error -body {
     file mkdir ""
-} -result {can't create directory "": No such file or directory}
+} -result {can't create directory "": no such file or directory}
 test filesystem-6.19 {empty file name} {file nativename ""} {}
 test filesystem-6.20 {empty file name} {file normalize ""} {}
 test filesystem-6.21 {empty file name} {file owned ""} 0
@@ -541,17 +541,17 @@ test filesystem-6.22 {empty file name} {file pathtype ""} relative
 test filesystem-6.23 {empty file name} {file readable ""} 0
 test filesystem-6.24 {empty file name} -returnCodes error -body {
     file readlink ""
-} -result {could not read link "": No such file or directory}
+} -result {could not read link "": no such file or directory}
 test filesystem-6.25 {empty file name} -returnCodes error -body {
     file rename "" ""
-} -result {error renaming "": No such file or directory}
+} -result {error renaming "": no such file or directory}
 test filesystem-6.26 {empty file name} {file rootname ""} {}
 test filesystem-6.27 {empty file name} -returnCodes error -body {
     file separator ""
 } -result {unrecognised path}
 test filesystem-6.28 {empty file name} -returnCodes error -body {
     file size ""
-} -result {could not read "": No such file or directory}
+} -result {could not read "": no such file or directory}
 test filesystem-6.29 {empty file name} {file split ""} {}
 test filesystem-6.30 {empty file name} -returnCodes error -body {
     file system ""
@@ -559,7 +559,7 @@ test filesystem-6.30 {empty file name} -returnCodes error -body {
 test filesystem-6.31 {empty file name} {file tail ""} {}
 test filesystem-6.32 {empty file name} -returnCodes error -body {
     file type ""
-} -result {could not read "": No such file or directory}
+} -result {could not read "": no such file or directory}
 test filesystem-6.33 {empty file name} {file writable ""} 0
 test filesystem-6.34 {file name with (invalid) nul character} {
     list [catch "open foo\x00" msg] $msg
@@ -692,7 +692,7 @@ test filesystem-7.4 {cross-filesystem file copy with -force} -setup {
     file delete -force simplefile
     file delete -force file2
     cd $dir
-} -result {0 {} 1 {error copying "simplefs:/simplefile" to "file2": File exists} 0 {} 1}
+} -result {0 {} 1 {error copying "simplefs:/simplefile" to "file2": file exists} 0 {} 1}
 test filesystem-7.5 {cross-filesystem file copy with -force} -setup {
     set dir [pwd]
     cd [tcltest::temporaryDirectory]
@@ -717,7 +717,7 @@ test filesystem-7.5 {cross-filesystem file copy with -force} -setup {
     file delete -force simplefile
     file delete -force file2
     cd $dir
-} -result {0 {} 1 {error copying "simplefs:/simplefile" to "file2": File exists} 0 {} 1}
+} -result {0 {} 1 {error copying "simplefs:/simplefile" to "file2": file exists} 0 {} 1}
 test filesystem-7.6 {cross-filesystem dir copy with -force} -setup {
     set dir [pwd]
     cd [tcltest::temporaryDirectory]
@@ -745,7 +745,7 @@ test filesystem-7.6 {cross-filesystem dir copy with -force} -setup {
     file delete -force simpledir
     file delete -force dir2
     cd $dir
-} -result {0 {} 1 {error copying "simplefs:/simpledir" to "dir2/simpledir": File exists} 0 {} 1 1}
+} -result {0 {} 1 {error copying "simplefs:/simpledir" to "dir2/simpledir": file exists} 0 {} 1 1}
 test filesystem-7.7 {cross-filesystem dir copy with -force} -setup {
     set dir [pwd]
     cd [tcltest::temporaryDirectory]
@@ -775,7 +775,7 @@ test filesystem-7.7 {cross-filesystem dir copy with -force} -setup {
     file delete -force simpledir
     file delete -force dir2
     cd $dir
-} -result {0 {} 1 {error copying "simplefs:/simpledir" to "dir2/simpledir": File exists} 0 {} 1 1}
+} -result {0 {} 1 {error copying "simplefs:/simpledir" to "dir2/simpledir": file exists} 0 {} 1 1}
 removeFile gorp.file
 test filesystem-7.8 {vfs cd} -setup {
     set dir [pwd]
diff --git a/tests/http.test b/tests/http.test
index 6e973d0..e9a0b31 100644
--- a/tests/http.test
+++ b/tests/http.test
@@ -630,7 +630,7 @@ test http-4.14.$ThreadLevel {http::Event} -body {
     lindex [http::error $token] 0
 } -cleanup {
     catch {http::cleanup $token}
-} -result {Connect failed: Connection refused}
+} -result {connect failed: connection refused}
 
 # Bogus host
 test http-4.15.$ThreadLevel {http::Event} -body {
diff --git a/tests/io.test b/tests/io.test
index ea0f7a2..7c80f9b 100644
--- a/tests/io.test
+++ b/tests/io.test
@@ -2855,8 +2855,8 @@ test io-29.27 {Tcl_Flush on closed pipeline} stdio {
 	}
     }
     regsub {".*":} $x {"":} x
-    set x
-} {1 {error flushing "": Broken pipe} {POSIX EPIPE {Broken pipe}}}
+    string tolower $x
+} {1 {error flushing "": broken pipe} {posix epipe {broken pipe}}}
 test io-29.28 {Tcl_WriteChars, lf mode} {
     file delete $path(test1)
     set f [open $path(test1) w]
@@ -4753,8 +4753,8 @@ test io-34.8 {Tcl_Seek on pipes: not supported} stdio {
     set x [list [catch {seek $f1 0 current} msg] $msg]
     close $f1
     regsub {".*":} $x {"":} x
-    set x
-} {1 {error during seek on "": Invalid argument}}
+    string tolower $x
+} {1 {error during seek on "": invalid argument}}
 test io-34.9 {Tcl_Seek, testing buffered input flushing} {
     file delete $path(test3)
     set f [open $path(test3) w]
@@ -5931,11 +5931,11 @@ test io-40.10 {POSIX open access modes: RDONLY} {
 test io-40.11 {POSIX open access modes: RDONLY} -match regexp -body {
     file delete $path(test3)
     open $path(test3) RDONLY
-} -returnCodes error -result {(?i)couldn't open ".*test3": No such file or directory}
+} -returnCodes error -result {(?i)couldn't open ".*test3": no such file or directory}
 test io-40.12 {POSIX open access modes: WRONLY} -match regexp -body {
     file delete $path(test3)
     open $path(test3) WRONLY
-} -returnCodes error -result {(?i)couldn't open ".*test3": No such file or directory}
+} -returnCodes error -result {(?i)couldn't open ".*test3": no such file or directory}
 test io-40.13 {POSIX open access modes: WRONLY} {
     makeFile xyzzy test3
     set f [open $path(test3) WRONLY]
@@ -5951,7 +5951,7 @@ test io-40.13 {POSIX open access modes: WRONLY} {
 test io-40.14 {POSIX open access modes: RDWR} -match regexp -body {
     file delete $path(test3)
     open $path(test3) RDWR
-} -returnCodes error -result {(?i)couldn't open ".*test3": No such file or directory}
+} -returnCodes error -result {(?i)couldn't open ".*test3": no such file or directory}
 test io-40.15 {POSIX open access modes: RDWR} {
     makeFile xyzzy test3
     set f [open $path(test3) RDWR]
@@ -7638,7 +7638,7 @@ test io-52.20 {TclCopyChannel & encodings} -setup {
 } -cleanup {
     close $in
     close $out
-} -returnCodes 1 -match glob -result {error reading "file*": Invalid or incomplete multibyte or wide character}
+} -returnCodes 1 -match glob -result {error reading "file*": invalid or incomplete multibyte or wide character}
 test io-52.21 {TclCopyChannel & encodings} -setup {
     set out [open $path(utf8-fcopy.txt) w]
     fconfigure $out -encoding utf-8 -translation lf
@@ -7659,7 +7659,7 @@ test io-52.21 {TclCopyChannel & encodings} -setup {
 } -cleanup {
     close $in
     close $out
-} -returnCodes 1 -match glob -result {error writing "file*": Invalid or incomplete multibyte or wide character}
+} -returnCodes 1 -match glob -result {error writing "file*": invalid or incomplete multibyte or wide character}
 test io-52.22 {TclCopyChannel & encodings} -setup {
     set out [open $path(utf8-fcopy.txt) w]
     fconfigure $out -encoding utf-8 -translation lf
@@ -7686,7 +7686,7 @@ test io-52.22 {TclCopyChannel & encodings} -setup {
     close $in
     close $out
     unset ::s0
-} -match glob -result {0 {error reading "file*": Invalid or incomplete multibyte or wide character}}
+} -match glob -result {0 {error reading "file*": invalid or incomplete multibyte or wide character}}
 test io-52.23 {TclCopyChannel & encodings} -setup {
     set out [open $path(utf8-fcopy.txt) w]
     fconfigure $out -encoding utf-8 -translation lf
@@ -7713,7 +7713,7 @@ test io-52.23 {TclCopyChannel & encodings} -setup {
     close $in
     close $out
     unset ::s0
-} -match glob -result {0 {error writing "file*": Invalid or incomplete multibyte or wide character}}
+} -match glob -result {0 {error writing "file*": invalid or incomplete multibyte or wide character}}
 
 
 test io-53.1 {CopyData} {fcopy} {
@@ -8696,7 +8696,7 @@ test io-60.1 {writing illegal utf sequences} {fileevent testbytestring} {
     # cut of the remainder of the error stack, especially the filename
     set result [lreplace $result 3 3 [lindex [split [lindex $result 3] \n] 0]]
     list $x $result
-} {1 {gets ABC catch {error writing "stdout": Invalid or incomplete multibyte or wide character}}}
+} {1 {gets ABC catch {error writing "stdout": invalid or incomplete multibyte or wide character}}}
 
 test io-61.1 {Reset eof state after changing the eof char} -setup {
     set datafile [makeFile {} eofchar]
@@ -9166,7 +9166,7 @@ test io-75.6 {invalid utf-8 encoding gets is not ignored (-profile strict)} -set
 } -cleanup {
     close $f
     removeFile io-75.6
-} -match glob -returnCodes 1 -result {error reading "*": Invalid or incomplete multibyte or wide character}
+} -match glob -returnCodes 1 -result {error reading "*": invalid or incomplete multibyte or wide character}
 
 test io-75.7 {invalid utf-8 encoding gets is not ignored (-profile strict)} -setup {
     set fn [makeFile {} io-75.7]
@@ -9182,7 +9182,7 @@ test io-75.7 {invalid utf-8 encoding gets is not ignored (-profile strict)} -set
 } -cleanup {
     close $f
     removeFile io-75.7
-} -match glob -returnCodes 1 -result {error reading "*": Invalid or incomplete multibyte or wide character}
+} -match glob -returnCodes 1 -result {error reading "*": invalid or incomplete multibyte or wide character}
 
 test io-75.8 {invalid utf-8 encoding eof handling (-profile strict)} -setup {
     set fn [makeFile {} io-75.8]
@@ -9216,7 +9216,7 @@ test io-75.9 {unrepresentable character write passes and is replaced by ?} -setu
 } -cleanup {
     close $f
     removeFile io-75.9
-} -match glob -result [list {A} {error writing "*": Invalid or incomplete multibyte or wide character}]
+} -match glob -result [list {A} {error writing "*": invalid or incomplete multibyte or wide character}]
 
 # Incomplete sequence test.
 # This error may IMHO only be detected with the close.
@@ -9260,7 +9260,7 @@ test io-75.11 {shiftjis encoding error read results in raw bytes} -setup {
 } -cleanup {
     close $f
     removeFile io-75.11
-} -match glob -result {41 1 {error reading "*": Invalid or incomplete multibyte or wide character}}
+} -match glob -result {41 1 {error reading "*": invalid or incomplete multibyte or wide character}}
 
 test io-75.12 {invalid utf-8 encoding read is ignored} -setup {
     set fn [makeFile {} io-75.12]
@@ -9295,7 +9295,7 @@ test io-75.13 {invalid utf-8 encoding read is not ignored (-profile strict)} -se
 } -cleanup {
     close $f
     removeFile io-75.13
-} -match glob -result {41 1 {error reading "*": Invalid or incomplete multibyte or wide character}}
+} -match glob -result {41 1 {error reading "*": invalid or incomplete multibyte or wide character}}
 
 # ### ### ### ######### ######### #########
 
diff --git a/tests/ioCmd.test b/tests/ioCmd.test
index 483781e..61b3bdd 100644
--- a/tests/ioCmd.test
+++ b/tests/ioCmd.test
@@ -439,7 +439,7 @@ test iocmd-11.3 {I/O to command pipelines} {unixOrWin unixExecs} {
 } {1 {can't read output from command: standard output was redirected} {TCL OPERATION EXEC BADREDIRECT}}
 test iocmd-11.4 {I/O to command pipelines} {notValgrind unixOrWin} {
     list [catch {open "| no_such_command_exists" rb} msg] $msg $::errorCode
-} {1 {couldn't execute "no_such_command_exists": No such file or directory} {POSIX ENOENT {No such file or directory}}}
+} {1 {couldn't execute "no_such_command_exists": no such file or directory} {POSIX ENOENT {no such file or directory}}}
 
 test iocmd-12.1 {POSIX open access modes: RDONLY} {
     file delete $path(test1)
@@ -456,11 +456,11 @@ test iocmd-12.1 {POSIX open access modes: RDONLY} {
 test iocmd-12.2 {POSIX open access modes: RDONLY} -match regexp -body {
     file delete $path(test3)
     open $path(test3) RDONLY
-} -returnCodes error -result {(?i)couldn't open ".*test3": No such file or directory}
+} -returnCodes error -result {(?i)couldn't open ".*test3": no such file or directory}
 test iocmd-12.3 {POSIX open access modes: WRONLY} -match regexp -body {
     file delete $path(test3)
     open $path(test3) WRONLY
-} -returnCodes error -result {(?i)couldn't open ".*test3": No such file or directory}
+} -returnCodes error -result {(?i)couldn't open ".*test3": no such file or directory}
 #
 # Test 13.4 relies on assigning the same channel name twice.
 #
@@ -486,7 +486,7 @@ test iocmd-12.4 {POSIX open access modes: WRONLY} {unix} {
 test iocmd-12.5 {POSIX open access modes: RDWR} -match regexp -body {
     file delete $path(test3)
     open $path(test3) RDWR
-} -returnCodes error -result {(?i)couldn't open ".*test3": No such file or directory}
+} -returnCodes error -result {(?i)couldn't open ".*test3": no such file or directory}
 test iocmd-12.6 {POSIX open access modes: errors} {
     concat [catch {open $path(test3) "FOO \{BAR BAZ"} msg] $msg\n$::errorInfo
 } "1 unmatched open brace in list
@@ -545,8 +545,8 @@ test iocmd-13.5 {errors in open command} {
 test iocmd-13.6 {errors in open command} {
     set msg [list [catch {open _non_existent_} msg] $msg $::errorCode]
     regsub [file join {} _non_existent_] $msg "_non_existent_" msg
-    set msg
-} {1 {couldn't open "_non_existent_": No such file or directory} {POSIX ENOENT {No such file or directory}}}
+    string tolower $msg
+} {1 {couldn't open "_non_existent_": no such file or directory} {posix enoent {no such file or directory}}}
 test iocmd-13.7 {errors in open command} {
     list [catch {open $path(test1) b} msg] $msg
 } {1 {illegal access mode "b"}}
@@ -884,7 +884,7 @@ test iocmd-21.22 {[close] in [read] segfaults} -setup {
 } -returnCodes error -cleanup {
     catch {close $ch}
     rename foo {}
-} -match glob -result {*Invalid argument*}
+} -match glob -result {*invalid argument*}
 test iocmd-21.23 {[close] in [gets] segfaults} -setup {
     proc foo {method chan args} {
 	switch -- $method initialize {
@@ -1743,7 +1743,7 @@ test iocmd-28.10 {chan seek, not supported by handler} -match glob -body {
     close $c
     rename foo {}
     set res
-} -result {1 {error during seek on "rc*": Invalid argument}}
+} -result {1 {error during seek on "rc*": invalid argument}}
 test iocmd-28.11 {chan seek, error return} -match glob -body {
     set res {}
     proc foo {args} {oninit seek; onfinal; track; return -code error BOOM!}
@@ -3433,7 +3433,7 @@ test iocmd.tf-28.10 {chan seek, not supported by handler} -match glob -body {
     } c]
     rename foo {}
     set res
-} -result {1 {error during seek on "rc*": Invalid argument}} \
+} -result {1 {error during seek on "rc*": invalid argument}} \
     -constraints {testchannel thread}
 test iocmd.tf-28.11 {chan seek, error return} -match glob -body {
     set res {}
diff --git a/tests/load.test b/tests/load.test
index 32b1c3b..005c451 100644
--- a/tests/load.test
+++ b/tests/load.test
@@ -96,13 +96,13 @@ test load-3.1 {error in _Init procedure, same interpreter} \
 	[list $dll $loaded] {
     list [catch {load [file join $testDir pkge$ext] pkge} msg] \
 	    $msg $::errorInfo $::errorCode
-} {1 {couldn't open "non_existent": No such file or directory} {couldn't open "non_existent": No such file or directory
+} {1 {couldn't open "non_existent": no such file or directory} {couldn't open "non_existent": no such file or directory
     while executing
 "open non_existent"
     invoked from within
 "if 44 {open non_existent}"
     invoked from within
-"load [file join $testDir pkge$ext] pkge"} {POSIX ENOENT {No such file or directory}}}
+"load [file join $testDir pkge$ext] pkge"} {POSIX ENOENT {no such file or directory}}}
 test load-3.2 {error in _Init procedure, child interpreter} \
 	[list $dll $loaded] {
     catch {interp delete x}
@@ -113,13 +113,13 @@ test load-3.2 {error in _Init procedure, child interpreter} \
 	    $msg $::errorInfo $::errorCode]
     interp delete x
     set result
-} {1 {couldn't open "non_existent": No such file or directory} {couldn't open "non_existent": No such file or directory
+} {1 {couldn't open "non_existent": no such file or directory} {couldn't open "non_existent": no such file or directory
     while executing
 "open non_existent"
     invoked from within
 "if 44 {open non_existent}"
     invoked from within
-"load [file join $testDir pkge$ext] pkge x"} {POSIX ENOENT {No such file or directory}}}
+"load [file join $testDir pkge$ext] pkge x"} {POSIX ENOENT {no such file or directory}}}
 
 test load-4.1 {reloading package into same interpreter} [list $dll $loaded] {
     list [catch {load [file join $testDir pkga$ext] pkga} msg] $msg
diff --git a/tests/macOSXFCmd.test b/tests/macOSXFCmd.test
index dc0eca0..5a62a2a 100644
--- a/tests/macOSXFCmd.test
+++ b/tests/macOSXFCmd.test
@@ -34,7 +34,7 @@ if {[testConstraint unix] && $tcl_platform(os) eq "Darwin"} {
 test macOSXFCmd-1.1 {MacOSXGetFileAttribute - file not found} {macosxFileAttr notRoot} {
     catch {file delete -force -- foo.test}
     list [catch {file attributes foo.test -creator} msg] $msg
-} {1 {could not read "foo.test": No such file or directory}}
+} {1 {could not read "foo.test": no such file or directory}}
 test macOSXFCmd-1.2 {MacOSXGetFileAttribute - creator} {macosxFileAttr notRoot} {
     catch {file delete -force -- foo.test}
     close [open foo.test w]
@@ -63,7 +63,7 @@ test macOSXFCmd-1.5 {MacOSXGetFileAttribute - rsrclength} {macosxFileAttr notRoo
 test macOSXFCmd-2.1 {MacOSXSetFileAttribute - file not found} {macosxFileAttr notRoot} {
     catch {file delete -force -- foo.test}
     list [catch {file attributes foo.test -creator FOOC} msg] $msg
-} {1 {could not read "foo.test": No such file or directory}}
+} {1 {could not read "foo.test": no such file or directory}}
 test macOSXFCmd-2.2 {MacOSXSetFileAttribute - creator} {macosxFileAttr notRoot} {
     catch {file delete -force -- foo.test}
     close [open foo.test w]
diff --git a/tests/result.test b/tests/result.test
index 3a86930..5ae29b2 100644
--- a/tests/result.test
+++ b/tests/result.test
@@ -62,7 +62,7 @@ test result-2.1 {Tcl_RestoreInterpResult} {testsaveresult} {
 
 test result-3.1 {Tcl_DiscardInterpResult} -constraints testsaveresult -body {
     testsaveresult append {cd _foobar} 1
-} -returnCodes error -result {couldn't change working directory to "_foobar": No such file or directory}
+} -returnCodes error -result {couldn't change working directory to "_foobar": no such file or directory}
 test result-3.2 {Tcl_DiscardInterpResult} {testsaveresult} {
     testsaveresult free {set x 42} 1
 } {42}
diff --git a/tests/safe-stock.test b/tests/safe-stock.test
index f79db4f..d23d86e 100644
--- a/tests/safe-stock.test
+++ b/tests/safe-stock.test
@@ -45,7 +45,7 @@ foreach i [interp children] {
 if {[string match *zipfs:/* [info library]]} {
     # pkgIndex.tcl is in [info library]
     # file to be sourced is in [info library]/opt*
-    set pkgOptErrMsg {Permission denied}
+    set pkgOptErrMsg {permission denied}
 } else {
     # pkgIndex.tcl and file to be sourced are
     # both in [info library]/opt*
diff --git a/tests/safe.test b/tests/safe.test
index 8efed54..f3890b7 100644
--- a/tests/safe.test
+++ b/tests/safe.test
@@ -549,7 +549,7 @@ test safe-8.3 {safe source control on file} -setup {
     safe::interpDelete $i
     rename safe-test-log {}
     unset i log
-} -result {1 {Permission denied} {{ERROR for child a : ".": is a directory}}}
+} -result {1 {permission denied} {{ERROR for child a : ".": is a directory}}}
 test safe-8.4 {safe source control on file} -setup {
     set i "a"
     catch {safe::interpDelete $i}
@@ -565,7 +565,7 @@ test safe-8.4 {safe source control on file} -setup {
     safe::interpDelete $i
     rename safe-test-log {}
     unset i log
-} -result {1 {Permission denied} {{ERROR for child a : "/abc/def": not in access_path}}}
+} -result {1 {permission denied} {{ERROR for child a : "/abc/def": not in access_path}}}
 test safe-8.5 {safe source control on file} -setup {
     set i "a"
     catch {safe::interpDelete $i}
@@ -585,7 +585,7 @@ test safe-8.5 {safe source control on file} -setup {
     safe::interpDelete $i
     rename safe-test-log {}
     unset i log
-} -result [list 1 {No such file or directory} [list "ERROR for child a : [file join [info library] blah]:No such file or directory"]]
+} -result [list 1 {no such file or directory} [list "ERROR for child a : [file join [info library] blah]:no such file or directory"]]
 test safe-8.6 {safe source control on file} -setup {
     set i "a"
     catch {safe::interpDelete $i}
@@ -603,7 +603,7 @@ test safe-8.6 {safe source control on file} -setup {
     safe::interpDelete $i
     rename safe-test-log {}
     unset i log
-} -result [list 1 {No such file or directory} [list "ERROR for child a : [file join [info library] blah.tcl]:No such file or directory"]]
+} -result [list 1 {no such file or directory} [list "ERROR for child a : [file join [info library] blah.tcl]:no such file or directory"]]
 test safe-8.7 {safe source control on file} -setup {
     set i "a"
     catch {safe::interpDelete $i}
@@ -623,7 +623,7 @@ test safe-8.7 {safe source control on file} -setup {
     safe::interpDelete $i
     rename safe-test-log {}
     unset i log
-} -result [list 1 {No such file or directory} [list "ERROR for child a : [file join [info library] xxxxxxxxxxx.tcl]:No such file or directory"]]
+} -result [list 1 {no such file or directory} [list "ERROR for child a : [file join [info library] xxxxxxxxxxx.tcl]:no such file or directory"]]
 test safe-8.8 {safe source forbids -rsrc} emptyTest {
     # Disabled this test.  It was only useful for long unsupported
     # Mac OS 9 systems. [Bug 860a9f1945]
@@ -1389,14 +1389,14 @@ test safe-10.2 {testing statics loading / -nostatics} -constraints tcl::test -bo
     interp eval $i {load {} Safepfx1}
 } -returnCodes error -cleanup {
     safe::interpDelete $i
-} -result {Permission denied (static library)}
+} -result {permission denied (static library)}
 test safe-10.3 {testing nested statics loading / no nested by default} -setup {
     set i [safe::interpCreate]
 } -constraints tcl::test -body {
     interp eval $i {interp create x; load {} Safepfx1 x}
 } -returnCodes error -cleanup {
     safe::interpDelete $i
-} -result {Permission denied (nested load)}
+} -result {permission denied (nested load)}
 test safe-10.4 {testing nested statics loading / -nestedloadok} -constraints tcl::test -body {
     set i [safe::interpCreate -nestedloadok]
     interp eval $i {interp create x; load {} Safepfx1 x}
@@ -1521,21 +1521,21 @@ test safe-12.1 {glob is restricted [Bug 2906841]} -setup {
     $i eval glob ../*
 } -returnCodes error -cleanup {
     safe::interpDelete $i
-} -result "Permission denied"
+} -result "permission denied"
 test safe-12.2 {glob is restricted [Bug 2906841]} -setup {
     set i [safe::interpCreate]
 } -body {
     $i eval glob -directory .. *
 } -returnCodes error -cleanup {
     safe::interpDelete $i
-} -result "Permission denied"
+} -result "permission denied"
 test safe-12.3 {glob is restricted [Bug 2906841]} -setup {
     set i [safe::interpCreate]
 } -body {
     $i eval glob -join .. *
 } -returnCodes error -cleanup {
     safe::interpDelete $i
-} -result "Permission denied"
+} -result "permission denied"
 test safe-12.4 {glob is restricted [Bug 2906841]} -setup {
     set i [safe::interpCreate]
 } -body {
@@ -1563,7 +1563,7 @@ test safe-12.7 {glob is restricted} -setup {
     $i eval glob *
 } -returnCodes error -cleanup {
     safe::interpDelete $i
-} -result {Permission denied}
+} -result {permission denied}
 
 ### 13. More tests for Safe base glob, with patches @ Bug 2964715
 ###     More tests of glob in sections 12, 16.
@@ -1590,7 +1590,7 @@ test safe-13.1 {glob is restricted [Bug 2964715]} -setup {
     $i eval glob *
 } -returnCodes error -cleanup {
     safe::interpDelete $i
-} -result {Permission denied}
+} -result {permission denied}
 test safe-13.2 {mimic the valid glob call by ::tcl::tm::UnknownHandler [Bug 2964715]} -setup {
     set i [safe::interpCreate]
     buildEnvironment deleteme.tm
@@ -1614,7 +1614,7 @@ test safe-13.3 {cf 13.2 but test glob failure when -directory is outside access
 } -returnCodes error -cleanup {
     safe::interpDelete $i
     removeDirectory $testdir
-} -result {Permission denied}
+} -result {permission denied}
 test safe-13.4 {another valid glob call [Bug 2964715]} -setup {
     set i [safe::interpCreate]
     buildEnvironment deleteme.tm
@@ -1642,7 +1642,7 @@ test safe-13.5 {as 13.4 but test glob failure when -directory is outside access
 } -returnCodes error -cleanup {
     safe::interpDelete $i
     removeDirectory $testdir
-} -result {Permission denied}
+} -result {permission denied}
 test safe-13.6 {as 13.4 but test silent failure when result is outside access_path [Bug 2964715]} -setup {
     set i [safe::interpCreate]
     buildEnvironment deleteme.tm
diff --git a/tests/socket.test b/tests/socket.test
index 2509bc0..052733f 100644
--- a/tests/socket.test
+++ b/tests/socket.test
@@ -645,7 +645,7 @@ test socket_$af-2.9 {socket conflict} -constraints [list socket supported_$af st
     close $f
 } -returnCodes error -cleanup {
     close $s
-} -match glob -result {couldn't open socket: Address already in use*}
+} -match glob -result {couldn't open socket: address already in use*}
 test socket_$af-2.10 {close on accept, accepted socket lives} -setup {
     set done 0
     set timer [after 20000 "set done timed_out"]
@@ -802,7 +802,7 @@ test socket_$af-3.1 {socket conflict} -constraints [list socket supported_$af st
 } -cleanup {
     puts $f bye
     close $f
-} -returnCodes error -result {couldn't open socket: Address already in use}
+} -returnCodes error -result {couldn't open socket: address already in use}
 test socket_$af-3.2 {server with several clients} -setup {
     file delete $path(script)
     set f [open $path(script) w]
@@ -1397,7 +1397,7 @@ test socket_$af-11.6 {socket conflict} -setup {
     list [getPort $s2] [close $s2]
 } -cleanup {
     close $s1
-} -returnCodes error -result {couldn't open socket: Address already in use}
+} -returnCodes error -result {couldn't open socket: address already in use}
 test socket_$af-11.7 {server with several clients} -setup {
     set port [sendCommand {
 	set server [socket -server accept 0]
@@ -2041,7 +2041,7 @@ test socket-14.1 {[socket -async] fileevent while still connecting} \
         close $client
         unset x
     } -result {{} ok}
-test socket-14.2 {[socket -async] fileevent Connection refused} \
+test socket-14.2 {[socket -async] fileevent connection refused} \
     -constraints {socket} \
     -body {
         set client [socket -async localhost [randport]]
@@ -2054,7 +2054,7 @@ test socket-14.2 {[socket -async] fileevent Connection refused} \
         after cancel $after
         close $client
         unset x after client
-    } -result {ok {Connection refused}}
+    } -result {ok {connection refused}}
 test socket-14.3 {[socket -async] when server only listens on IPv6} \
     -constraints {socket supported_inet6 localhost_v6} \
     -setup {
@@ -2113,7 +2113,7 @@ test socket-14.5 {[socket -async] which fails before any connect() can be made}
         socket -async -myaddr 192.0.2.42 127.0.0.1 [randport]
     } \
     -returnCodes 1 \
-    -result {couldn't open socket: Cannot assign requested address}
+    -result {couldn't open socket: cannot assign requested address}
 test socket-14.6.0 {[socket -async] with no event loop and server listening on IPv4} \
     -constraints {socket supported_inet localhost_v4} \
     -setup {
@@ -2226,7 +2226,7 @@ test socket-14.7.2 {pending [socket -async] and blocking [gets], no listener} \
         list $x [fconfigure $sock -error] [fconfigure $sock -error]
     } -cleanup {
         close $sock
-    } -match glob -result {{error reading "sock*": Transport endpoint is not connected} {Connection refused} {}}
+    } -match glob -result {{error reading "sock*": transport endpoint is not connected} {connection refused} {}}
 test socket-14.8.0 {pending [socket -async] and nonblocking [gets], server is IPv4} \
     -constraints {socket supported_inet localhost_v4} \
     -setup {
@@ -2291,7 +2291,7 @@ test socket-14.8.2 {pending [socket -async] and nonblocking [gets], no listener}
         list $x [fconfigure $sock -error] [fconfigure $sock -error]
     } -cleanup {
         close $sock
-    } -match glob -result {{error reading "sock*": Transport endpoint is not connected} {Connection refused} {}}
+    } -match glob -result {{error reading "sock*": transport endpoint is not connected} {connection refused} {}}
 test socket-14.9.0 {pending [socket -async] and blocking [puts], server is IPv4} \
     -constraints {socket supported_inet localhost_v4} \
     -setup {
@@ -2406,7 +2406,7 @@ test socket-14.11.0 {pending [socket -async] and nonblocking [puts], no listener
     } -cleanup {
         catch {close $sock}
         unset x
-    } -result {Transport endpoint is not connected} -returnCodes 1
+    } -result {transport endpoint is not connected} -returnCodes 1
 test socket-14.11.1 {pending [socket -async] and nonblocking [puts], no listener, flush} \
     -constraints {socket testsocket_testflags} \
     -body {
@@ -2425,7 +2425,7 @@ test socket-14.11.1 {pending [socket -async] and nonblocking [puts], no listener
     } -cleanup {
         catch {close $sock}
         catch {unset x}
-    } -result {Transport endpoint is not connected} -returnCodes 1
+    } -result {transport endpoint is not connected} -returnCodes 1
 test socket-14.12 {[socket -async] background progress triggered by [fconfigure -error]} \
     -constraints {socket} \
     -body {
@@ -2439,7 +2439,7 @@ test socket-14.12 {[socket -async] background progress triggered by [fconfigure
     } -cleanup {
         close $s
         unset x s
-    } -result {Connection refused}
+    } -result {connection refused}
 
 test socket-14.13 {testing writable event when quick failure} \
     -constraints {socket win supported_inet notWine} \
@@ -2543,7 +2543,7 @@ set num 0
 set x {localhost {socket} 127.0.0.1 {supported_inet} ::1 {supported_inet6}}
 set resultok {-result "sock*" -match glob}
 set resulterr {
-    -result {couldn't open socket: Connection refused}
+    -result {couldn't open socket: connection refused}
     -returnCodes 1
 }
 foreach {servip sc} $x {
diff --git a/tests/source.test b/tests/source.test
index 59a9d1a..f5f9f0f 100644
--- a/tests/source.test
+++ b/tests/source.test
@@ -104,8 +104,8 @@ test source-2.6 {source error conditions} -setup {
     removeFile _non_existent_
 } -body {
     source $sourcefile
-} -match glob -result {couldn't read file "*_non_existent_": No such file or directory} \
-	-errorCode {POSIX ENOENT {No such file or directory}}
+} -match glob -result {couldn't read file "*_non_existent_": no such file or directory} \
+	-errorCode {POSIX ENOENT {no such file or directory}}
 test source-2.7 {utf-8 with BOM} -setup {
     set sourcefile [makeFile {} source.file]
 } -body {
diff --git a/tests/unixFCmd.test b/tests/unixFCmd.test
index 4f5d8f4..1250c0b 100644
--- a/tests/unixFCmd.test
+++ b/tests/unixFCmd.test
@@ -103,7 +103,7 @@ test unixFCmd-1.1 {TclpRenameFile: EACCES} -setup {
 } -returnCodes error -cleanup {
     file attributes td1/td2 -permissions 0o755
     cleanup
-} -result {error renaming "td1/td2/td3": Permission denied}
+} -result {error renaming "td1/td2/td3": permission denied}
 test unixFCmd-1.2 {TclpRenameFile: EEXIST} -setup {
     cleanup
 } -constraints {unix notRoot} -body {
@@ -112,7 +112,7 @@ test unixFCmd-1.2 {TclpRenameFile: EEXIST} -setup {
     file rename td2 td1
 } -returnCodes error -cleanup {
     cleanup
-} -result {error renaming "td2" to "td1/td2": File exists}
+} -result {error renaming "td2" to "td1/td2": file exists}
 test unixFCmd-1.3 {TclpRenameFile: EINVAL} -setup {
     cleanup
 } -constraints {unix notRoot} -body {
@@ -131,7 +131,7 @@ test unixFCmd-1.5 {TclpRenameFile: ENOENT} -setup {
     file rename td2 td1
 } -returnCodes error -cleanup {
     cleanup
-} -result {error renaming "td2": No such file or directory}
+} -result {error renaming "td2": no such file or directory}
 test unixFCmd-1.6 {TclpRenameFile: ENOTDIR} {emptyTest unix notRoot} {
     # can't make it happen
 } {}
@@ -145,7 +145,7 @@ test unixFCmd-1.7 {TclpRenameFile: EXDEV} -setup {
     catch {file delete /tmp/bar}
     catch {file attr foo -perm 0o40777}
     catch {file delete -force foo}
-} -match glob -result {*: Permission denied}
+} -match glob -result {*: permission denied}
 test unixFCmd-1.8 {Checking EINTR Bug} {unix notRoot nonPortable} {
     testalarm
     after 2000
@@ -261,7 +261,7 @@ test unixFCmd-12.1 {GetGroupAttribute - file not found} -setup {
     catch {file delete -force -- foo.test}
 } -constraints {unix notRoot} -returnCodes error -body {
     file attributes foo.test -group
-} -result {could not read "foo.test": No such file or directory}
+} -result {could not read "foo.test": no such file or directory}
 test unixFCmd-12.2 {GetGroupAttribute - file found} -setup {
     catch {file delete -force -- foo.test}
 } -constraints {unix notRoot} -body {
@@ -275,7 +275,7 @@ test unixFCmd-13.1 {GetOwnerAttribute - file not found} -setup {
     catch {file delete -force -- foo.test}
 } -constraints {unix notRoot} -returnCodes error -body {
     file attributes foo.test -group
-} -result {could not read "foo.test": No such file or directory}
+} -result {could not read "foo.test": no such file or directory}
 test unixFCmd-13.2 {GetOwnerAttribute} -setup {
     catch {file delete -force -- foo.test}
 } -constraints {unix notRoot} -body {
@@ -289,7 +289,7 @@ test unixFCmd-14.1 {GetPermissionsAttribute - file not found} -setup {
     catch {file delete -force -- foo.test}
 } -constraints {unix notRoot} -returnCodes error -body {
     file attributes foo.test -permissions
-} -result {could not read "foo.test": No such file or directory}
+} -result {could not read "foo.test": no such file or directory}
 test unixFCmd-14.2 {GetPermissionsAttribute} -setup {
     catch {file delete -force -- foo.test}
 } -constraints {unix notRoot} -body {
@@ -311,7 +311,7 @@ test unixFCmd-15.2 {SetGroupAttribute - invalid file} -setup {
     catch {file delete -force -- foo.test}
 } -constraints {unix notRoot foundGroup} -returnCodes error -body {
     file attributes foo.test -group $group
-} -result {could not set group for file "foo.test": No such file or directory}
+} -result {could not set group for file "foo.test": no such file or directory}
 
 #changing owners hard to do
 test unixFCmd-16.1 {SetOwnerAttribute - current owner} -setup {
@@ -327,7 +327,7 @@ test unixFCmd-16.2 {SetOwnerAttribute - invalid file} -setup {
     catch {file delete -force -- foo.test}
 } -constraints {unix notRoot} -returnCodes error -body {
     file attributes foo.test -owner $user
-} -result {could not set owner for file "foo.test": No such file or directory}
+} -result {could not set owner for file "foo.test": no such file or directory}
 test unixFCmd-16.3 {SetOwnerAttribute - invalid owner} -setup {
     catch {file delete -force -- foo.test}
 } -constraints {unix notRoot} -returnCodes error -body {
@@ -347,7 +347,7 @@ test unixFCmd-17.2 {SetPermissionsAttribute} -setup {
     catch {file delete -force -- foo.test}
 } -constraints {unix notRoot} -returnCodes error -body {
     file attributes foo.test -permissions 0
-} -result {could not set permissions for file "foo.test": No such file or directory}
+} -result {could not set permissions for file "foo.test": no such file or directory}
 test unixFCmd-17.3 {SetPermissionsAttribute} -setup {
     catch {file delete -force -- foo.test}
 } -constraints {unix notRoot} -body {
@@ -404,7 +404,7 @@ test unixFCmd-19.1 {GetReadOnlyAttribute - file not found} -setup {
     catch {file delete -force -- foo.test}
 } -constraints {unix notRoot readonlyAttr} -returnCodes error -body {
     file attributes foo.test -readonly
-} -result {could not read "foo.test": No such file or directory}
+} -result {could not read "foo.test": no such file or directory}
 test unixFCmd-19.2 {GetReadOnlyAttribute} -setup {
     catch {file delete -force -- foo.test}
 } -constraints {unix notRoot readonlyAttr} -body {
@@ -430,7 +430,7 @@ test unixFCmd-20.2 {SetReadOnlyAttribute} -setup {
     catch {file delete -force -- foo.test}
 } -constraints {unix notRoot readonlyAttr} -returnCodes error -body {
     file attributes foo.test -readonly 1
-} -result {could not read "foo.test": No such file or directory}
+} -result {could not read "foo.test": no such file or directory}
 
 # cleanup
 cleanup
diff --git a/tests/winFCmd.test b/tests/winFCmd.test
index 6848f21..3be1920 100644
--- a/tests/winFCmd.test
+++ b/tests/winFCmd.test
@@ -946,12 +946,12 @@ test winFCmd-10.1 {AttributesPosixError - get} -constraints {win} -setup {
     cleanup
 } -body {
     file attributes td1 -archive
-} -returnCodes error -result {could not read "td1": No such file or directory}
+} -returnCodes error -result {could not read "td1": no such file or directory}
 test winFCmd-10.2 {AttributesPosixError - set} -constraints {win} -setup {
     cleanup
 } -body {
     file attributes td1 -archive 0
-} -returnCodes error -result {could not read "td1": No such file or directory}
+} -returnCodes error -result {could not read "td1": no such file or directory}
 
 test winFCmd-11.1 {GetWinFileAttributes} -constraints {win} -setup {
     cleanup
@@ -1098,7 +1098,7 @@ test winFCmd-15.1 {SetWinFileAttributes} -constraints {win} -setup {
     cleanup
 } -body {
     file attributes td1 -archive 0
-} -returnCodes error -result {could not read "td1": No such file or directory}
+} -returnCodes error -result {could not read "td1": no such file or directory}
 test winFCmd-15.2 {SetWinFileAttributes - archive} -constraints {win} -setup {
     cleanup
 } -body {
@@ -1268,11 +1268,11 @@ test winFCmd-17.1 {Windows bad permissions cd} -constraints win -body {
 	regsub ".*: " $err "" err
 	set err
     } else {
-        set err "Permission denied"
+        set err "permission denied"
     }
 } -cleanup {
     cd $pwd
-} -result "Permission denied"
+} -result "permission denied"
 
 cd $pwd
 unset d dd pwd