1 files changed, 33 insertions, 0 deletions
diff --git a/devtools/client/webconsole/test/browser/browser_jsterm_instance_of.js b/devtools/client/webconsole/test/browser/browser_jsterm_instance_of.js
new file mode 100644
index 0000000000..1ec14a421c
--- /dev/null
+++ b/devtools/client/webconsole/test/browser/browser_jsterm_instance_of.js
@@ -0,0 +1,33 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Check instanceof correctness. See Bug 599940.
+const TEST_URI =
+  "data:text/html,<!DOCTYPE html>Test <code>instanceof</code> evaluation";
+
+add_task(async function () {
+  const hud = await openNewTabAndConsole(TEST_URI);
+
+  let message = await executeAndWaitForResultMessage(
+    hud,
+    "[] instanceof Array",
+    "true"
+  );
+  ok(message, "`instanceof Array` is correct");
+
+  message = await executeAndWaitForResultMessage(
+    hud,
+    "({}) instanceof Object",
+    "true"
+  );
+  ok(message, "`instanceof Object` is correct");
+
+  message = await executeAndWaitForResultMessage(
+    hud,
+    "({}) instanceof Array",
+    "false"
+  );
+  ok(message, "`instanceof Array` has expected result");
+});