FEATURE: Display notification count in title for logged in users (#7184)

This replaces the 'contextual' counters for logged in users. We will still use the old method for anon users

test/javascripts/lib/discourse-test.js.es6

@@ -1,3 +1,5 @@
+import { logIn, replaceCurrentUser } from "helpers/qunit-helpers";
+
 QUnit.module("lib:discourse");
 
 QUnit.test("getURL on subfolder install", assert => {
@@ -24,3 +26,64 @@ QUnit.test("getURLWithCDN on subfolder install with S3", assert => {
   Discourse.S3CDN = null;
   Discourse.S3BaseUrl = null;
 });
+
+QUnit.test("title counts are updated correctly", assert => {
+  Discourse.set("hasFocus", true);
+  Discourse.set("contextCount", 0);
+  Discourse.set("notificationCount", 0);
+
+  Discourse.set("_docTitle", "Test Title");
+
+  assert.equal(document.title, "Test Title", "title is correct");
+
+  Discourse.updateNotificationCount(5);
+  assert.equal(document.title, "Test Title", "title doesn't change with focus");
+
+  Discourse.incrementBackgroundContextCount();
+  assert.equal(document.title, "Test Title", "title doesn't change with focus");
+
+  Discourse.set("hasFocus", false);
+
+  Discourse.updateNotificationCount(5);
+  assert.equal(
+    document.title,
+    "Test Title",
+    "notification count ignored for anon"
+  );
+
+  Discourse.incrementBackgroundContextCount();
+  assert.equal(
+    document.title,
+    "(1) Test Title",
+    "title changes when incremented for anon"
+  );
+
+  logIn();
+  replaceCurrentUser({ dynamic_favicon: false });
+
+  Discourse.set("hasFocus", true);
+  Discourse.set("hasFocus", false);
+
+  Discourse.incrementBackgroundContextCount();
+  assert.equal(
+    document.title,
+    "Test Title",
+    "title doesn't change when incremented for logged in"
+  );
+
+  Discourse.updateNotificationCount(3);
+  assert.equal(
+    document.title,
+    "(3) Test Title",
+    "title includes notification count for logged in user"
+  );
+
+  Discourse.set("hasFocus", false);
+  Discourse.set("hasFocus", true);
+
+  assert.equal(
+    document.title,
+    "Test Title",
+    "counter dissappears after focus, and doesn't reappear until another notification arrives"
+  );
+});