Adds tests for the MiniPipelineGraph class

app/assets/javascripts/mini_pipeline_graph_dropdown.js.es6

@@ -16,8 +16,8 @@
  */
 (() => {
   class MiniPipelineGraph {
-    constructor({ container }) {
-      this.container = container;
+    constructor(opts = {}) {
+      this.container = opts.container || '';
       this.dropdownListSelector = '.js-builds-dropdown-container';
       this.getBuildsList = this.getBuildsList.bind(this);
 
@@ -57,6 +57,8 @@
     getBuildsList(e) {
       const endpoint = e.currentTarget.dataset.stageEndpoint;
 
+      console.log('ENDPOINT', endpoint);
+
       return $.ajax({
         dataType: 'json',
         type: 'GET',

spec/javascripts/fixtures/mini_dropdown_graph.html.haml

+%div.js-builds-dropdown-tests
+  %button.dropdown.js-builds-dropdown-button{'data-stage-endpoint' => 'foobar'}
+    Dropdown
+  %div.js-builds-dropdown-container
+    %div.js-builds-dropdown-list
+
+    %div.js-builds-dropdown-loading.builds-dropdown-loading.hidden
+      %span.fa.fa-spinner.fa-spin

spec/javascripts/mini_pipeline_graph_dropdown_spec.js.es6

+/* eslint-disable no-new */
+
+//= require flash
+//= require mini_pipeline_graph_dropdown
+
+(() => {
+  describe('Mini Pipeline Graph Dropdown', () => {
+    fixture.preload('mini_dropdown_graph');
+
+    beforeEach(() => {
+      fixture.load('mini_dropdown_graph');
+    });
+
+    describe('When is initialized', () => {
+      it('should initialize without errors when no options are given', () => {
+        const miniPipelineGraph = new window.gl.MiniPipelineGraph();
+
+        expect(miniPipelineGraph.dropdownListSelector).toEqual('.js-builds-dropdown-container');
+      });
+
+      it('should set the container as the given prop', () => {
+        const container = '.foo';
+
+        const miniPipelineGraph = new window.gl.MiniPipelineGraph({ container });
+
+        expect(miniPipelineGraph.container).toEqual(container);
+      });
+    });
+
+    describe('When dropdown is clicked', () => {
+      it('should call getBuildsList', () => {
+        const getBuildsListSpy = spyOn(gl.MiniPipelineGraph.prototype, 'getBuildsList').and.callFake(function () {});
+
+        new gl.MiniPipelineGraph({ container: '.js-builds-dropdown-tests' });
+
+        document.querySelector('.js-builds-dropdown-button').click();
+
+        expect(getBuildsListSpy).toHaveBeenCalled();
+      });
+
+      it('should make a request to the endpoint provided in the html', () => {
+        const ajaxSpy = spyOn($, 'ajax').and.callFake(function () {});
+
+        new gl.MiniPipelineGraph({ container: '.js-builds-dropdown-tests' });
+
+        document.querySelector('.js-builds-dropdown-button').click();
+        expect(ajaxSpy.calls.allArgs()[0][0].url).toEqual('foobar');
+      });
+    });
+  });
+})();