1 files changed, 72 insertions, 0 deletions
diff --git a/devtools/client/framework/test/browser_toolbox_watchedByDevTools.js b/devtools/client/framework/test/browser_toolbox_watchedByDevTools.js
new file mode 100644
index 0000000000..a58b57885d
--- /dev/null
+++ b/devtools/client/framework/test/browser_toolbox_watchedByDevTools.js
@@ -0,0 +1,72 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Check that the "watchedByDevTools" flag is properly handled.
+ */
+const EXAMPLE_HTTP_URI =
+  "http://mochi.test:8888/document-builder.sjs?html=<div id=http>http";
+const EXAMPLE_COM_URI =
+  "https://example.com/document-builder.sjs?html=<div id=com>com";
+const EXAMPLE_ORG_URI =
+  "https://example.org/document-builder.sjs?headers=Cross-Origin-Opener-Policy:same-origin&html=<div id=org>org</div>";
+
+add_task(async function () {
+  const tab = await addTab(EXAMPLE_HTTP_URI);
+
+  is(
+    tab.linkedBrowser.browsingContext.watchedByDevTools,
+    false,
+    "watchedByDevTools isn't set when DevTools aren't opened"
+  );
+
+  info(
+    "Open a toolbox for the opened tab and check that watchedByDevTools is set"
+  );
+  await gDevTools.showToolboxForTab(tab, { toolId: "options" });
+
+  is(
+    tab.linkedBrowser.browsingContext.watchedByDevTools,
+    true,
+    "watchedByDevTools is set after opening a toolbox"
+  );
+
+  info(
+    "Check that watchedByDevTools persist when the tab navigates to a different origin"
+  );
+  await navigateTo(EXAMPLE_COM_URI);
+
+  is(
+    tab.linkedBrowser.browsingContext.watchedByDevTools,
+    true,
+    "watchedByDevTools is still set after navigating to a different origin"
+  );
+
+  info(
+    "Check that watchedByDevTools persist when navigating to a page that creates a new browsing context"
+  );
+  const previousBrowsingContextId = tab.linkedBrowser.browsingContext.id;
+  await navigateTo(EXAMPLE_ORG_URI);
+
+  isnot(
+    tab.linkedBrowser.browsingContext.id,
+    previousBrowsingContextId,
+    "A new browsing context was created"
+  );
+
+  is(
+    tab.linkedBrowser.browsingContext.watchedByDevTools,
+    true,
+    "watchedByDevTools is still set after navigating to a new browsing context"
+  );
+
+  info("Check that the flag is reset when the toolbox is closed");
+  await gDevTools.closeToolboxForTab(tab);
+  is(
+    tab.linkedBrowser.browsingContext.watchedByDevTools,
+    false,
+    "watchedByDevTools is reset after closing the toolbox"
+  );
+});