1 files changed, 50 insertions, 0 deletions
diff --git a/devtools/client/responsive/test/browser/browser_toolbox_swap_inspector.js b/devtools/client/responsive/test/browser/browser_toolbox_swap_inspector.js
new file mode 100644
index 0000000000..a5262eeec5
--- /dev/null
+++ b/devtools/client/responsive/test/browser/browser_toolbox_swap_inspector.js
@@ -0,0 +1,50 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Verify that inspector does not reboot when opening and closing RDM.
+
+const TEST_URL = "http://example.com/";
+
+const checkToolbox = async function (tab, location) {
+  const toolbox = gDevTools.getToolboxForTab(tab);
+  ok(!!toolbox, `Toolbox exists ${location}`);
+};
+
+addRDMTask(
+  "",
+  async function () {
+    const tab = await addTab(TEST_URL);
+
+    info("Open toolbox outside RDM");
+    {
+      const { toolbox, inspector } = await openInspector();
+      inspector.walker.once("new-root", () => {
+        ok(false, "Inspector saw new root, would reboot!");
+      });
+      checkToolbox(tab, "outside RDM");
+      await openRDM(tab);
+      checkToolbox(tab, "after opening RDM");
+      await closeRDM(tab);
+      checkToolbox(tab, tab.linkedBrowser, "after closing RDM");
+      await toolbox.destroy();
+    }
+
+    info("Open toolbox inside RDM");
+    {
+      const { ui } = await openRDM(tab);
+      const { toolbox, inspector } = await openInspector();
+      inspector.walker.once("new-root", () => {
+        ok(false, "Inspector saw new root, would reboot!");
+      });
+      checkToolbox(tab, ui.getViewportBrowser(), "inside RDM");
+      await closeRDM(tab);
+      checkToolbox(tab, tab.linkedBrowser, "after closing RDM");
+      await toolbox.destroy();
+    }
+
+    await removeTab(tab);
+  },
+  { onlyPrefAndTask: true }
+);