import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

devtools/client/responsive.html/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 RDM closes synchronously when tabs change remoteness.
+
+const TEST_URL = "http://example.com/";
+
+add_task(function* () {
+  let tab = yield addTab(TEST_URL);
+
+  let { ui } = yield openRDM(tab);
+  let clientClosed = waitForClientClose(ui);
+
+  closeRDM(tab, {
+    reason: "BeforeTabRemotenessChange",
+  });
+
+  // This flag is set at the end of `ResponsiveUI.destroy`.  If it is true
+  // without yielding on `closeRDM` above, then we must have closed
+  // synchronously.
+  is(ui.destroyed, true, "RDM closed synchronously");
+
+  yield clientClosed;
+  yield removeTab(tab);
+});
+
+add_task(function* () {
+  let tab = yield addTab(TEST_URL);
+
+  let { ui } = yield openRDM(tab);
+  let clientClosed = waitForClientClose(ui);
+
+  // Load URL that requires the main process, forcing a remoteness flip
+  yield load(tab.linkedBrowser, "about:robots");
+
+  // This flag is set at the end of `ResponsiveUI.destroy`.  If it is true without
+  // yielding on `closeRDM` itself and only removing the tab, then we must have closed
+  // synchronously in response to tab closing.
+  is(ui.destroyed, true, "RDM closed synchronously");
+
+  yield clientClosed;
+  yield removeTab(tab);
+});