1 files changed, 45 insertions, 0 deletions
diff --git a/devtools/client/responsive/test/browser/browser_tab_remoteness_change.js b/devtools/client/responsive/test/browser/browser_tab_remoteness_change.js
new file mode 100644
index 0000000000..9a445b6fd6
--- /dev/null
+++ b/devtools/client/responsive/test/browser/browser_tab_remoteness_change.js
@@ -0,0 +1,45 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Verify Fission-enabled RDM remains open when tab changes remoteness.
+
+const { PromiseTestUtils } = ChromeUtils.importESModule(
+  "resource://testing-common/PromiseTestUtils.sys.mjs"
+);
+PromiseTestUtils.allowMatchingRejectionsGlobally(
+  /Permission denied to access property "document" on cross-origin object/
+);
+
+const Types = require("resource://devtools/client/responsive/types.js");
+
+const TEST_URL = "http://example.com/";
+
+addRDMTask(
+  null,
+  async function () {
+    const tab = await addTab(TEST_URL);
+
+    const { ui } = await openRDM(tab);
+    const { store } = ui.toolWindow;
+    await waitUntilState(
+      store,
+      state =>
+        state.viewports.length == 1 &&
+        state.devices.listState == Types.loadableState.LOADED
+    );
+
+    // Load URL that requires the main process, forcing a remoteness flip
+    await navigateTo("about:robots");
+
+    // Bug 1625501: RDM will remain open when the embedded browser UI is enabled.
+    is(ui.destroyed, false, "RDM is still open.");
+
+    info("Close RDM");
+    await closeRDM(tab);
+
+    await removeTab(tab);
+  },
+  { onlyPrefAndTask: true }
+);