Bug 1764318 - Add more test for fullscreen; r=smaug

Differential Revision: https://phabricator.services.mozilla.com/D143489

browser/base/content/test/fullscreen/browser.ini

@@ -15,7 +15,9 @@ skip-if =
 [browser_fullscreen_enterInUrlbar.js]
 skip-if = (os == 'mac') || (os == 'linux') #Bug 1648649
 [browser_fullscreen_window_open.js]
-skip-if = debug && os == 'mac' # Bug 1568570
+skip-if =
+  debug && os == 'mac' # Bug 1568570
+  swgl
 [browser_fullscreen_window_focus.js]
 skip-if =
   os == 'mac' # Bug 1568570

browser/base/content/test/fullscreen/browser_fullscreen_window_open.js

@@ -28,6 +28,26 @@ async function testWindowOpen(iframeID) {
   BrowserTestUtils.removeTab(tab);
 }
 
+async function testWindowOpenExistingWindow() {
+  let tab = await BrowserTestUtils.openNewForegroundTab(gBrowser, TEST_URL);
+  let popup = await jsWindowOpen(tab.linkedBrowser, true);
+
+  info("re-focusing main window");
+  await waitForFocus(tab.linkedBrowser);
+
+  info("Entering full-screen");
+  await changeFullscreen(tab.linkedBrowser, true);
+
+  await testExpectFullScreenExit(tab.linkedBrowser, true, async () => {
+    info("Calling window.open() again should reuse the existing window");
+    jsWindowOpen(tab.linkedBrowser, true);
+  });
+
+  // Cleanup
+  await BrowserTestUtils.closeWindow(popup);
+  BrowserTestUtils.removeTab(tab);
+}
+
 add_setup(async function() {
   await SpecialPowers.pushPrefEnv({
     set: [
@@ -44,3 +64,8 @@ add_task(function test_parentWindowOpen() {
 add_task(function test_iframeWindowOpen() {
   return testWindowOpen(IFRAME_ID);
 });
+
+add_task(function test_parentWindowOpenExistWindow() {
+  return testWindowOpenExistingWindow();
+});
+

browser/base/content/test/fullscreen/open_and_focus_helper.html

@@ -35,7 +35,7 @@
         window.openedWindow = window.open('https://example.com' + window.location.pathname);
         if (canReply) event.ports[0].postMessage('opened');
       } else if(event.data === "openpopup") {
-        window.openedWindow = window.open('https://example.com' + window.location.pathname, '', 'top=0,height=1, width=300');
+        window.openedWindow = window.open('https://example.com' + window.location.pathname, 'test', 'top=0,height=1, width=300');
         if (canReply) event.ports[0].postMessage('popupopened');
       } else if(event.data === "focus") {
         window.openedWindow.focus();