StackedProgressBar Component tests

spec/javascripts/vue_shared/components/stacked_progress_bar_spec.js

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+import Vue from 'vue';
+
+import stackedProgressBarComponent from '~/vue_shared/components/stacked_progress_bar.vue';
+
+import mountComponent from '../../helpers/vue_mount_component_helper';
+
+const createComponent = (config) => {
+  const Component = Vue.extend(stackedProgressBarComponent);
+  const defaultConfig = Object.assign({}, {
+    successLabel: 'Synced',
+    failureLabel: 'Failed',
+    neutralLabel: 'Out of sync',
+    successCount: 10,
+    failureCount: 5,
+    totalCount: 20,
+  }, config);
+
+  return mountComponent(Component, defaultConfig);
+};
+
+describe('StackedProgressBarComponent', () => {
+  let vm;
+
+  beforeEach(() => {
+    vm = createComponent();
+  });
+
+  afterEach(() => {
+    vm.$destroy();
+  });
+
+  describe('computed', () => {
+    describe('neutralCount', () => {
+      it('returns neutralCount based on totalCount, successCount and failureCount', () => {
+        expect(vm.neutralCount).toBe(5); // 20 - 10 - 5
+      });
+    });
+  });
+
+  describe('methods', () => {
+    describe('getPercent', () => {
+      it('returns percentage from provided count based on `totalCount`', () => {
+        expect(vm.getPercent(10)).toBe(50);
+      });
+    });
+
+    describe('barStyle', () => {
+      it('returns style string based on percentage provided', () => {
+        expect(vm.barStyle(50)).toBe('width: 50%;');
+      });
+    });
+
+    describe('getTooltip', () => {
+      it('returns label string based on label and count provided', () => {
+        expect(vm.getTooltip('Synced', 10)).toBe('Synced: 10');
+      });
+    });
+  });
+
+  describe('template', () => {
+    it('renders container element', () => {
+      expect(vm.$el.classList.contains('stacked-progress-bar')).toBeTruthy();
+    });
+
+    it('renders empty state when count is unavailable', () => {
+      const vmX = createComponent({ totalCount: 0, successCount: 0, failureCount: 0 });
+      expect(vmX.$el.querySelectorAll('.status-unavailable').length).not.toBe(0);
+      vmX.$destroy();
+    });
+
+    it('renders bar elements when count is available', () => {
+      expect(vm.$el.querySelectorAll('.status-green').length).not.toBe(0);
+      expect(vm.$el.querySelectorAll('.status-neutral').length).not.toBe(0);
+      expect(vm.$el.querySelectorAll('.status-red').length).not.toBe(0);
+    });
+  });
+});