1 files changed, 10 insertions, 0 deletions
diff --git a/js/src/tests/non262/class/shell.js b/js/src/tests/non262/class/shell.js
new file mode 100644
index 0000000000..1169b2c5f4
--- /dev/null
+++ b/js/src/tests/non262/class/shell.js
@@ -0,0 +1,10 @@
+function assertThrownErrorContains(thunk, substr) {
+    try {
+        thunk();
+    } catch (e) {
+        if (e.message.indexOf(substr) !== -1)
+            return;
+        throw new Error("Expected error containing " + substr + ", got " + e);
+    }
+    throw new Error("Expected error containing " + substr + ", no exception thrown");
+}