1 files changed, 37 insertions, 0 deletions
diff --git a/devtools/client/aboutdebugging/test/browser_page_not_found.js b/devtools/client/aboutdebugging/test/browser_page_not_found.js
new file mode 100644
index 000000000..107bc8b91
--- /dev/null
+++ b/devtools/client/aboutdebugging/test/browser_page_not_found.js
@@ -0,0 +1,37 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+// Test that navigating to a about:debugging#invalid-hash should show up an
+// error page.
+// Every url navigating including #invalid-hash should be kept in history and
+// navigate back as expected.
+add_task(function* () {
+  let { tab, document } = yield openAboutDebugging("invalid-hash");
+  let element = document.querySelector(".header-name");
+  is(element.textContent, "Page not found", "Show error page");
+
+  yield openPanel(document, "addons-panel");
+  yield waitForInitialAddonList(document);
+  element = document.querySelector(".header-name");
+  is(element.textContent, "Add-ons", "Show Addons");
+
+  yield changeAboutDebuggingHash(document, "invalid-hash");
+  element = document.querySelector(".header-name");
+  is(element.textContent, "Page not found", "Show error page");
+
+  gBrowser.goBack();
+  yield waitForMutation(
+    document.querySelector(".main-content"), {childList: true});
+  yield waitForInitialAddonList(document);
+  element = document.querySelector(".header-name");
+  is(element.textContent, "Add-ons", "Show Addons");
+
+  gBrowser.goBack();
+  yield waitForMutation(
+    document.querySelector(".main-content"), {childList: true});
+  element = document.querySelector(".header-name");
+  is(element.textContent, "Page not found", "Show error page");
+
+  yield closeAboutDebugging(tab);
+});