Bug 1525245 - Stabilize cookiePolicy/cookiePermission for live documents - part 6 - Tests for SharedWorker and cookie settings changing, r=Ehsan

Differential Revision: https://phabricator.services.mozilla.com/D18954

--HG--
extra : moz-landing-system : lando

netwerk/cookie/test/browser/browser.ini

@@ -6,3 +6,4 @@ support-files =
 [browser_broadcastChannel.js]
 [browser_originattributes.js]
 [browser_storage.js]
+[browser_sharedWorker.js]

netwerk/cookie/test/browser/browser_sharedWorker.js

@@ -0,0 +1,16 @@
+CookiePolicyHelper.runTest("SharedWorker", {
+  cookieJarAccessAllowed: async _ => {
+    new content.SharedWorker("a.js", "foo");
+    ok(true, "SharedWorker is allowed");
+  },
+
+  cookieJarAccessDenied: async _ => {
+    try {
+      new content.SharedWorker("a.js", "foo");
+      ok(false, "SharedWorker cannot be used!");
+    } catch (e) {
+      ok(true, "SharedWorker cannot be used!");
+      is(e.name, "SecurityError", "We want a security error message.");
+    }
+  },
+});