Bug 1275043

1 files changed, 72 insertions, 1 deletions

diff --git a/tests/expr.test b/tests/expr.test
index b3707b8..af9b55c 100644
--- a/tests/expr.test
+++ b/tests/expr.test
@@ -10,7 +10,7 @@
 # See the file "license.terms" for information on usage and redistribution
 # of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 #
-# RCS: @(#) $Id: expr.test,v 1.17.2.5 2005/08/05 19:19:14 kennykb Exp $
+# RCS: @(#) $Id: expr.test,v 1.17.2.6 2005/08/29 16:37:45 kennykb Exp $
 
 if {[lsearch [namespace children] ::tcltest] == -1} {
     package require tcltest
@@ -827,6 +827,77 @@ test expr-38.1 {abs of smallest 32-bit integer [Bug 1241572]} {wideIs64bit} {
     expr {abs(int(-2147483648))}
 } 2147483648
 
+test expr-39.1 {round() rounds to +-infinity} {
+    expr round(0.5)
+} 1
+test expr-39.2 {round() rounds to +-infinity} {
+    expr round(1.5)
+} 2
+test expr-39.3 {round() rounds to +-infinity} {
+    expr round(-0.5)
+} -1
+test expr-39.4 {round() rounds to +-infinity} {
+    expr round(-1.5)
+} -2
+test expr-39.5 {round() overflow} {
+    list [catch {expr round(9.2233720368547758e+018)} result] $result
+} {1 {integer value too large to represent}}
+test expr-39.6 {round() overflow} {
+    list [catch {expr round(-9.2233720368547758e+018)} result] $result
+} {1 {integer value too large to represent}}
+test expr-39.7 {round() bad value} {
+    set x trash
+    list [catch {expr {round($x)}} result] $result
+} {1 {argument to math function didn't have numeric value}}
+test expr-39.8 {round() already an integer} {
+    set x 123456789012
+    incr x
+    expr round($x)
+} 123456789013
+test expr-39.9 {round() boundary case - 1/2 - 1 ulp} {
+    set x 0.25
+    set bit 0.125
+    while 1 {
+	set newx [expr {$x + $bit}]
+	if { $newx == $x || $newx == 0.5 } break
+	set x $newx
+	set bit [expr { $bit / 2.0 }]
+    }
+    expr {round($x)}
+} 0
+test expr-39.10 {round() boundary case - 1/2 + 1 ulp} {
+    set x 0.75
+    set bit 0.125
+    while 1 {
+	set newx [expr { $x - $bit }]
+	if { $newx == $x || $newx == 0.5 } break
+	set x $newx
+	set bit [expr { $bit / 2.0 }]
+    }
+    expr {round($x)}
+} 1
+test expr-39.11 {round() boundary case - -1/2 - 1 ulp} {
+    set x -0.75
+    set bit 0.125
+    while 1 {
+	set newx [expr { $x + $bit }]
+	if { $newx == $x || $newx == -0.5 } break
+	set x $newx
+	set bit [expr { $bit / 2.0 }]
+    }
+    expr {round($x)}
+} -1
+test expr-39.10 {round() boundary case - -1/2 + 1 ulp} {
+    set x -0.25
+    set bit 0.125
+    while 1 {
+	set newx [expr { $x - $bit }]
+	if { $newx == $x || $newx == -0.5 } break
+	set x $newx
+	set bit [expr { $bit / 2.0 }]
+    }
+    expr {round($x)}
+} 0
 
 # cleanup
 if {[info exists a]} {