1 files changed, 12 insertions, 12 deletions
diff --git a/tests/platform.test b/tests/platform.test
index 9c7dec5..19001ee 100644
--- a/tests/platform.test
+++ b/tests/platform.test
@@ -23,19 +23,19 @@ test platform-1.1 {TclpSetVariables: tcl_platform} {
     set result [i eval {lsort [array names tcl_platform]}]
     interp delete i
     set result
-} {byteOrder machine os osVersion platform user}
+} {byteOrder machine os osVersion platform user wordSize}
+
+# Test assumes twos-complement arithmetic, which is true of virtually
+# everything these days.  Note that this does *not* use wide(), and
+# this is intentional since that could make Tcl's numbers wider than
+# the machine-integer on some platforms...
+test platform-2.1 {tcl_platform(wordSize) indicates size of native word} {
+    set result [expr {1 << (8 * $tcl_platform(wordSize) - 1)}]
+    # Result must be the largest bit in a machine word, which this checks
+    # without assuming how wide the word really is
+    list [expr {$result < 0}] [expr {$result ^ ($result - 1)}]
+} {1 -1}
 
 # cleanup
 ::tcltest::cleanupTests
 return
-
-
-
-
-
-
-
-
-
-
-