1 files changed, 53 insertions, 0 deletions
diff --git a/dom/base/test/unit/test_js_dev_error_interceptor.js b/dom/base/test/unit/test_js_dev_error_interceptor.js
new file mode 100644
index 0000000000..8ccc0dcaf8
--- /dev/null
+++ b/dom/base/test/unit/test_js_dev_error_interceptor.js
@@ -0,0 +1,53 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+function errors() {
+  return [
+    // The following two errors MUST NOT be captured.
+    new Error("This is an error: " + Math.random()),
+    new RangeError("This is a RangeError: " + Math.random()),
+    new TypeError("This is a TypeError: " + Math.random()),
+    "This is a string: " + Math.random(),
+    null,
+    undefined,
+    Math.random(),
+    {},
+
+    // The following errors MUST be captured.
+    new SyntaxError("This is a SyntaxError: " + Math.random()),
+    new ReferenceError("This is a ReferenceError: " + Math.random()),
+  ];
+}
+
+function isDeveloperError(e) {
+  if (e == null || typeof e != "object") {
+    return false;
+  }
+
+  return e.constructor == SyntaxError || e.constructor == ReferenceError;
+}
+
+function run_test() {
+  ChromeUtils.clearRecentJSDevError();
+  Assert.equal(ChromeUtils.recentJSDevError, undefined);
+
+  for (let exn of errors()) {
+    ChromeUtils.clearRecentJSDevError();
+    try {
+      throw exn;
+    } catch (e) {
+      // Discard error.
+    }
+    if (isDeveloperError(exn)) {
+      Assert.equal(ChromeUtils.recentJSDevError.message, "" + exn);
+    } else {
+      Assert.equal(ChromeUtils.recentJSDevError, undefined);
+    }
+    ChromeUtils.clearRecentJSDevError();
+    Assert.equal(ChromeUtils.recentJSDevError, undefined);
+  }
+}