2 files changed, 17 insertions, 3 deletions
diff --git a/testcases b/testcases
index ba4ed64..8797315 100644
--- a/testcases
+++ b/testcases
@@ -7,3 +7,8 @@ hello
 ./cppawk -M 'BEGIN { print 1000000000000000000000000 + 1 }'
 :
 1000000000000000000000001
+--
+3:
+./cppawk -f
+:
+ERR
diff --git a/testsuite.cwk b/testsuite.cwk
index ce495d0..fd8fa7d 100755
--- a/testsuite.cwk
+++ b/testsuite.cwk
@@ -5,15 +5,24 @@ BEGIN {
   FS = ":\n"
 }
 
-function runtest(id, code, output)
+function runtest(id, code, output,
+                 failed)
 {
   print code > "script.sh"
   print output > "output"
 
-  if (system("[ \"$(sh script.sh)\" = \"$(cat output)\" ]") != 0) {
-    printf("test %s failed\n", id)
+  failed = 0
+
+  if (output == "ERR\n") {
+    if (system("sh script.sh > /dev/null 2>&1") == 0)
+      failed = 1
+  } else if (system("[ \"$(sh script.sh)\" = \"$(cat output)\" ]") != 0) {
+    failed = 1
   }
 
+  if (failed)
+    printf("test %s failed\n", id)
+
   close("script.sh")
   close("output")
 }