1 files changed, 38 insertions, 0 deletions
diff --git a/toolkit/components/pictureinpicture/tests/browser_privateWindow.js b/toolkit/components/pictureinpicture/tests/browser_privateWindow.js
new file mode 100644
index 0000000000..26d051b14a
--- /dev/null
+++ b/toolkit/components/pictureinpicture/tests/browser_privateWindow.js
@@ -0,0 +1,38 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * Tests that a Picture-in-Picture window opened by a Private browsing
+ * window has the "private" feature set on its window (which is important
+ * for some things, eg: taskbar grouping on Windows).
+ */
+add_task(async () => {
+  for (let videoID of ["with-controls", "no-controls"]) {
+    info(`Testing ${videoID} case.`);
+
+    let privateWin = await BrowserTestUtils.openNewBrowserWindow({
+      private: true,
+    });
+    let pipTab = await BrowserTestUtils.openNewForegroundTab(
+      privateWin.gBrowser,
+      TEST_PAGE
+    );
+    let browser = pipTab.linkedBrowser;
+
+    let pipWin = await triggerPictureInPicture(browser, videoID);
+    ok(pipWin, "Got Picture-in-Picture window.");
+
+    Assert.equal(
+      pipWin.docShell.treeOwner
+        .QueryInterface(Ci.nsIInterfaceRequestor)
+        .getInterface(Ci.nsIAppWindow).chromeFlags &
+        Ci.nsIWebBrowserChrome.CHROME_PRIVATE_WINDOW,
+      Ci.nsIWebBrowserChrome.CHROME_PRIVATE_WINDOW,
+      "Picture-in-Picture window should be marked as private"
+    );
+
+    await BrowserTestUtils.closeWindow(privateWin);
+  }
+});