1 files changed, 82 insertions, 0 deletions
diff --git a/spec/javascripts/vue_shared/components/sidebar/labels_select/dropdown_button_spec.js b/spec/javascripts/vue_shared/components/sidebar/labels_select/dropdown_button_spec.js
new file mode 100644
index 00000000000..ec63ac306d0
--- /dev/null
+++ b/spec/javascripts/vue_shared/components/sidebar/labels_select/dropdown_button_spec.js
@@ -0,0 +1,82 @@
+import Vue from 'vue';
+
+import dropdownButtonComponent from '~/vue_shared/components/sidebar/labels_select/dropdown_button.vue';
+
+import { mockConfig, mockLabels } from './mock_data';
+
+import mountComponent from '../../../../helpers/vue_mount_component_helper';
+
+const componentConfig = Object.assign({}, mockConfig, {
+  fieldName: 'label_id[]',
+  labels: mockLabels,
+  showExtraOptions: false,
+});
+
+const createComponent = (config = componentConfig) => {
+  const Component = Vue.extend(dropdownButtonComponent);
+
+  return mountComponent(Component, config);
+};
+
+describe('DropdownButtonComponent', () => {
+  let vm;
+
+  beforeEach(() => {
+    vm = createComponent();
+  });
+
+  afterEach(() => {
+    vm.$destroy();
+  });
+
+  describe('computed', () => {
+    describe('dropdownToggleText', () => {
+      it('returns text as `Label` when `labels` prop is empty array', () => {
+        const mockEmptyLabels = Object.assign({}, componentConfig, { labels: [] });
+        const vmEmptyLabels = createComponent(mockEmptyLabels);
+        expect(vmEmptyLabels.dropdownToggleText).toBe('Label');
+        vmEmptyLabels.$destroy();
+      });
+
+      it('returns first label name with remaining label count when `labels` prop has more than one item', () => {
+        const mockMoreLabels = Object.assign({}, componentConfig, {
+          labels: mockLabels.concat(mockLabels),
+        });
+        const vmMoreLabels = createComponent(mockMoreLabels);
+        expect(vmMoreLabels.dropdownToggleText).toBe('Foo Label +1 more');
+        vmMoreLabels.$destroy();
+      });
+
+      it('returns first label name when `labels` prop has only one item present', () => {
+        expect(vm.dropdownToggleText).toBe('Foo Label');
+      });
+    });
+  });
+
+  describe('template', () => {
+    it('renders component container element of type `button`', () => {
+      expect(vm.$el.nodeName).toBe('BUTTON');
+    });
+
+    it('renders component container element with required data attributes', () => {
+      expect(vm.$el.dataset.abilityName).toBe(vm.abilityName);
+      expect(vm.$el.dataset.fieldName).toBe(vm.fieldName);
+      expect(vm.$el.dataset.issueUpdate).toBe(vm.updatePath);
+      expect(vm.$el.dataset.labels).toBe(vm.labelsPath);
+      expect(vm.$el.dataset.namespacePath).toBe(vm.namespace);
+      expect(vm.$el.dataset.showAny).not.toBeDefined();
+    });
+
+    it('renders dropdown toggle text element', () => {
+      const dropdownToggleTextEl = vm.$el.querySelector('.dropdown-toggle-text');
+      expect(dropdownToggleTextEl).not.toBeNull();
+      expect(dropdownToggleTextEl.innerText.trim()).toBe('Foo Label');
+    });
+
+    it('renders dropdown button icon', () => {
+      const dropdownIconEl = vm.$el.querySelector('i.fa');
+      expect(dropdownIconEl).not.toBeNull();
+      expect(dropdownIconEl.classList.contains('fa-chevron-down')).toBe(true);
+    });
+  });
+});