tests: migrated tests for link_srv to jest, #9666

public/test/mocks/angular.ts

@@ -0,0 +1,17 @@
+export default class AngularJSMock {
+  service: any;
+  controller: any;
+  directive: any;
+
+  constructor() {
+    this.service = jest.fn();
+    this.controller = jest.fn();
+    this.directive = jest.fn();
+  }
+
+  module() {
+    return this;
+  }
+}
+
+module.exports = AngularJSMock;