1 files changed, 69 insertions, 0 deletions
diff --git a/devtools/client/inspector/test/browser_inspector_navigate_to_errors.js b/devtools/client/inspector/test/browser_inspector_navigate_to_errors.js
new file mode 100644
index 0000000000..7e43c68e17
--- /dev/null
+++ b/devtools/client/inspector/test/browser_inspector_navigate_to_errors.js
@@ -0,0 +1,69 @@
+/* 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";
+
+// Test that inspector works when navigating to error pages.
+
+const TEST_URL_1 =
+  'data:text/html,<html><body id="test-doc-1">page</body></html>';
+const TEST_URL_2 = "http://127.0.0.1:36325/";
+const TEST_URL_3 = "https://www.wronguri.wronguri/";
+const TEST_URL_4 = "data:text/html,<html><body>test-doc-4</body></html>";
+
+add_task(async function () {
+  // Open the inspector on a valid URL
+  const { inspector } = await openInspectorForURL(TEST_URL_1);
+
+  info("Navigate to closed port");
+  await navigateTo(TEST_URL_2, { isErrorPage: true });
+
+  const documentURI = await SpecialPowers.spawn(
+    gBrowser.selectedBrowser,
+    [],
+    () => {
+      return content.document.documentURI;
+    }
+  );
+  ok(documentURI.startsWith("about:neterror"), "content is correct.");
+
+  const hasPage = await getNodeFront("#test-doc-1", inspector);
+  ok(
+    !hasPage,
+    "Inspector actor is no longer able to reach previous page DOM node"
+  );
+
+  const hasNetErrorNode = await getNodeFront("#errorShortDesc", inspector);
+  ok(hasNetErrorNode, "Inspector actor is able to reach error page DOM node");
+
+  const bundle = Services.strings.createBundle(
+    "chrome://global/locale/appstrings.properties"
+  );
+  let domain = TEST_URL_2.match(/^http:\/\/(.*)\/$/)[1];
+  let errorMsg = bundle.formatStringFromName("connectionFailure", [domain]);
+  is(
+    await getDisplayedNodeTextContent("#errorShortDesc", inspector),
+    errorMsg,
+    "Inpector really inspects the error page"
+  );
+
+  info("Navigate to unknown domain");
+  await navigateTo(TEST_URL_3, { isErrorPage: true });
+
+  domain = TEST_URL_3.match(/^https:\/\/(.*)\/$/)[1];
+  errorMsg = bundle.formatStringFromName("dnsNotFound2", [domain]);
+  is(
+    await getDisplayedNodeTextContent("#errorShortDesc", inspector),
+    errorMsg,
+    "Inspector really inspects the new error page"
+  );
+
+  info("Navigate to a valid url");
+  await navigateTo(TEST_URL_4);
+
+  is(
+    await getDisplayedNodeTextContent("body", inspector),
+    "test-doc-4",
+    "Inspector really inspects the valid url"
+  );
+});