Integration tests for the breadcrumbs component

ui/app/templates/components/app-breadcrumbs.hbs

@@ -1,7 +1,7 @@
 {{#each breadcrumbs as |breadcrumb index|}}
   <li class="{{if (eq (inc index) breadcrumbs.length) "is-active"}}">
     {{#if breadcrumb.isPending}}
-      <a href="#" aria-label="loading">&hellip;</a>
+      <a href="#" aria-label="loading" data-test-breadcrumb="loading">&hellip;</a>
     {{else}}
       {{#link-to
         params=breadcrumb.args

ui/tests/integration/app-breadcrumbs-test.js

@@ -0,0 +1,85 @@
+import Service from '@ember/service';
+import { getOwner } from '@ember/application';
+import RSVP from 'rsvp';
+import { test, moduleForComponent } from 'ember-qunit';
+import { findAll } from 'ember-native-dom-helpers';
+import wait from 'ember-test-helpers/wait';
+import hbs from 'htmlbars-inline-precompile';
+import PromiseObject from 'nomad-ui/utils/classes/promise-object';
+
+moduleForComponent('app-breadcrumbs', 'Integration | Component | app breadcrumbs', {
+  integration: true,
+  beforeEach() {
+    const mockBreadcrumbs = Service.extend({
+      breadcrumbs: [],
+    });
+
+    this.register('service:breadcrumbs', mockBreadcrumbs);
+    this.breadcrumbs = getOwner(this).lookup('service:breadcrumbs');
+  },
+});
+
+const commonCrumbs = [{ label: 'One', args: ['one'] }, { label: 'Two', args: ['two'] }];
+
+const template = hbs`
+  {{app-breadcrumbs}}
+`;
+
+test('breadcrumbs comes from the breadcrumbs service', function(assert) {
+  this.breadcrumbs.set('breadcrumbs', commonCrumbs);
+
+  this.render(template);
+
+  assert.equal(
+    findAll('[data-test-breadcrumb]').length,
+    commonCrumbs.length,
+    'The number of crumbs matches the crumbs from the service'
+  );
+});
+
+test('every breadcrumb is rendered correctly', function(assert) {
+  this.breadcrumbs.set('breadcrumbs', commonCrumbs);
+
+  this.render(template);
+
+  const renderedCrumbs = findAll('[data-test-breadcrumb]');
+
+  renderedCrumbs.forEach((crumb, index) => {
+    assert.equal(
+      crumb.textContent.trim(),
+      commonCrumbs[index].label,
+      `Crumb ${index} is ${commonCrumbs[index].label}`
+    );
+  });
+});
+
+test('when breadcrumbs are pending promises, an ellipsis is rendered', function(assert) {
+  let resolvePromise;
+  const promise = new RSVP.Promise(resolve => {
+    resolvePromise = resolve;
+  });
+
+  this.breadcrumbs.set('breadcrumbs', [
+    { label: 'One', args: ['one'] },
+    PromiseObject.create({ promise }),
+    { label: 'Three', args: ['three'] },
+  ]);
+
+  this.render(template);
+
+  assert.equal(
+    findAll('[data-test-breadcrumb]')[1].textContent.trim(),
+    '…',
+    'Promise breadcrumb is in a loading state'
+  );
+
+  resolvePromise({ label: 'Two', args: ['two'] });
+
+  return wait().then(() => {
+    assert.equal(
+      findAll('[data-test-breadcrumb]')[1].textContent.trim(),
+      'Two',
+      'Promise breadcrumb has resolved and now renders Two'
+    );
+  });
+});