1 files changed, 59 insertions, 0 deletions
diff --git a/browser/base/content/test/plugins/browser_private_browsing_eme_persistent_state.js b/browser/base/content/test/plugins/browser_private_browsing_eme_persistent_state.js
new file mode 100644
index 0000000000..fba4bb552c
--- /dev/null
+++ b/browser/base/content/test/plugins/browser_private_browsing_eme_persistent_state.js
@@ -0,0 +1,59 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * This test ensures that navigator.requestMediaKeySystemAccess() requests
+ * to run EME with persistent state are rejected in private browsing windows.
+ * Bug 1334111.
+ */
+
+const TEST_URL =
+  getRootDirectory(gTestPath).replace(
+    "chrome://mochitests/content",
+    "https://example.com"
+  ) + "empty_file.html";
+
+async function isEmePersistentStateSupported(mode) {
+  let win = await BrowserTestUtils.openNewBrowserWindow(mode);
+  let tab = await BrowserTestUtils.openNewForegroundTab(win.gBrowser, TEST_URL);
+  let persistentStateSupported = await SpecialPowers.spawn(
+    tab.linkedBrowser,
+    [],
+    async function () {
+      try {
+        let config = [
+          {
+            initDataTypes: ["webm"],
+            videoCapabilities: [{ contentType: 'video/webm; codecs="vp9"' }],
+            persistentState: "required",
+          },
+        ];
+        await content.navigator.requestMediaKeySystemAccess(
+          "org.w3.clearkey",
+          config
+        );
+      } catch (ex) {
+        return false;
+      }
+      return true;
+    }
+  );
+
+  await BrowserTestUtils.closeWindow(win);
+
+  return persistentStateSupported;
+}
+
+add_task(async function test() {
+  is(
+    await isEmePersistentStateSupported({ private: true }),
+    false,
+    "EME persistentState should *NOT* be supported in private browsing window."
+  );
+  is(
+    await isEmePersistentStateSupported({ private: false }),
+    true,
+    "EME persistentState *SHOULD* be supported in non private browsing window."
+  );
+});