1 files changed, 41 insertions, 0 deletions
diff --git a/devtools/client/inspector/test/browser_inspector_open_on_neterror.js b/devtools/client/inspector/test/browser_inspector_open_on_neterror.js
new file mode 100644
index 0000000000..96354d3fab
--- /dev/null
+++ b/devtools/client/inspector/test/browser_inspector_open_on_neterror.js
@@ -0,0 +1,41 @@
+/* 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 correctly when opened against a net error page
+
+const TEST_URL_1 = "http://127.0.0.1:36325/";
+const TEST_URL_2 = "data:text/html,<html><body>test-doc-2</body></html>";
+
+add_task(async function () {
+  // We cannot directly use addTab here as waiting for error pages requires
+  // a specific code path.
+  gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser, TEST_URL_1);
+  await BrowserTestUtils.waitForErrorPage(gBrowser.selectedBrowser);
+
+  const { inspector } = await openInspector();
+  ok(true, "Inspector loaded on the already opened net error");
+
+  const documentURI = await SpecialPowers.spawn(
+    gBrowser.selectedBrowser,
+    [],
+    () => content.document.documentURI
+  );
+  ok(
+    documentURI.startsWith("about:neterror"),
+    "content is really a net error page."
+  );
+
+  const netErrorNode = await getNodeFront(".container", inspector);
+  ok(netErrorNode, "The inspector can get a node front from the neterror page");
+
+  info("Navigate to a valid url");
+  await navigateTo(TEST_URL_2);
+
+  is(
+    await getDisplayedNodeTextContent("body", inspector),
+    "test-doc-2",
+    "Inspector really inspects the valid url"
+  );
+});