1 files changed, 78 insertions, 0 deletions
diff --git a/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_addons_debug_nobg.js b/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_addons_debug_nobg.js
new file mode 100644
index 0000000000..4f8f35acd2
--- /dev/null
+++ b/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_addons_debug_nobg.js
@@ -0,0 +1,78 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+/* import-globals-from helper-addons.js */
+Services.scriptloader.loadSubScript(CHROME_URL_ROOT + "helper-addons.js", this);
+
+// There are shutdown issues for which multiple rejections are left uncaught.
+// See bug 1018184 for resolving these issues.
+const { PromiseTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/PromiseTestUtils.sys.mjs"
+);
+PromiseTestUtils.allowMatchingRejectionsGlobally(/File closed/);
+
+const ADDON_NOBG_ID = "test-devtools-webextension-nobg@mozilla.org";
+const ADDON_NOBG_NAME = "test-devtools-webextension-nobg";
+
+/**
+ * This test file ensures that the webextension addon developer toolbox:
+ * - the webextension developer toolbox is connected to a fallback page when the
+ *   background page is not available (and in the fallback page document body contains
+ *   the expected message, which warns the user that the current page is not a real
+ *   webextension context);
+ */
+add_task(async function testWebExtensionsToolboxNoBackgroundPage() {
+  await enableExtensionDebugging();
+  const { document, tab, window } = await openAboutDebugging();
+  await selectThisFirefoxPage(document, window.AboutDebugging.store);
+
+  await installTemporaryExtensionFromXPI(
+    {
+      // Do not pass any `background` script.
+      id: ADDON_NOBG_ID,
+      name: ADDON_NOBG_NAME,
+    },
+    document
+  );
+
+  info("Open a toolbox to debug the addon");
+  const { devtoolsWindow } = await openAboutDevtoolsToolbox(
+    document,
+    tab,
+    window,
+    ADDON_NOBG_NAME
+  );
+  const toolbox = getToolbox(devtoolsWindow);
+
+  ok(
+    toolbox.commands.descriptorFront.isWebExtensionDescriptor,
+    "Toolbox is debugging an addon"
+  );
+  const targetName = toolbox.target.name;
+  is(targetName, ADDON_NOBG_NAME, "Toolbox has the expected target");
+
+  const inspector = await toolbox.selectTool("inspector");
+
+  let nodeActor;
+  info(`Wait the fallback window to be fully loaded`);
+  await asyncWaitUntil(async () => {
+    nodeActor = await inspector.walker.querySelector(
+      inspector.walker.rootNode,
+      "h1"
+    );
+    return nodeActor && nodeActor.inlineTextChild;
+  });
+
+  info("Got a nodeActor with an inline text child");
+  const actualValue = nodeActor.inlineTextChild._form.nodeValue;
+  is(
+    actualValue,
+    "Your addon does not have any document opened yet.",
+    "nodeActor has the expected inlineTextChild value"
+  );
+
+  await closeWebExtAboutDevtoolsToolbox(devtoolsWindow, window);
+  await removeTemporaryExtension(ADDON_NOBG_NAME, document);
+  await removeTab(tab);
+});