1 files changed, 52 insertions, 0 deletions
diff --git a/t/op/inc.t b/t/op/inc.t
new file mode 100644
index 0000000000..aee91f798b
--- /dev/null
+++ b/t/op/inc.t
@@ -0,0 +1,52 @@
+#!./perl
+
+
+# $RCSfile$
+
+print "1..6\n";
+
+# Verify that addition/subtraction properly upgrade to doubles.
+# These tests are only useful on machines with 32 bit longs,
+# and one's complement negation, but shouldn't fail anywhere.
+
+$a = 2147483647;
+$a++;
+if ($a == 2147483648) 
+	{print "ok 1\n"}
+else
+	{print "not ok 1\n";}
+
+$a = 2147483647;
+$c=++$a;
+if ($a == 2147483648) 
+	{print "ok 2\n"}
+else
+	{print "not ok 2\n";}
+
+$a = 2147483647;
+$a=$a+1;
+if ($a == 2147483648) 
+	{print "ok 3\n"}
+else
+	{print "not ok 3\n";}
+
+$a = -2147483648;
+$c=$a--;
+if ($a == -2147483649) 
+	{print "ok 4\n"}
+else
+	{print "not ok 4\n";}
+
+$a = -2147483648;
+$c=--$a;
+if ($a == -2147483649) 
+	{print "ok 5\n"}
+else
+	{print "not ok 5\n";}
+
+$a = -2147483648;
+$a=$a-1;
+if ($a == -2147483649) 
+	{print "ok 6\n"}
+else
+	{print "not ok 6\n";}