1 files changed, 81 insertions, 0 deletions
diff --git a/spec/frontend/vue_shared/components/dropdown/dropdown_button_spec.js b/spec/frontend/vue_shared/components/dropdown/dropdown_button_spec.js
new file mode 100644
index 00000000000..892a96b76fd
--- /dev/null
+++ b/spec/frontend/vue_shared/components/dropdown/dropdown_button_spec.js
@@ -0,0 +1,81 @@
+import Vue from 'vue';
+
+import { mountComponentWithSlots } from 'helpers/vue_mount_component_helper';
+import dropdownButtonComponent from '~/vue_shared/components/dropdown/dropdown_button.vue';
+
+const defaultLabel = 'Select';
+const customLabel = 'Select project';
+
+const createComponent = (props, slots = {}) => {
+  const Component = Vue.extend(dropdownButtonComponent);
+
+  return mountComponentWithSlots(Component, { props, slots });
+};
+
+describe('DropdownButtonComponent', () => {
+  let vm;
+
+  beforeEach(() => {
+    vm = createComponent();
+  });
+
+  afterEach(() => {
+    vm.$destroy();
+  });
+
+  describe('computed', () => {
+    describe('dropdownToggleText', () => {
+      it('returns default toggle text', () => {
+        expect(vm.toggleText).toBe(defaultLabel);
+      });
+
+      it('returns custom toggle text when provided via props', () => {
+        const vmEmptyLabels = createComponent({ toggleText: customLabel });
+
+        expect(vmEmptyLabels.toggleText).toBe(customLabel);
+        vmEmptyLabels.$destroy();
+      });
+    });
+  });
+
+  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(defaultLabel);
+    });
+
+    it('renders dropdown button icon', () => {
+      const dropdownIconEl = vm.$el.querySelector('.dropdown-toggle-icon i.fa');
+
+      expect(dropdownIconEl).not.toBeNull();
+      expect(dropdownIconEl.classList.contains('fa-chevron-down')).toBe(true);
+    });
+
+    it('renders slot, if default slot exists', () => {
+      vm = createComponent(
+        {},
+        {
+          default: ['Lorem Ipsum Dolar'],
+        },
+      );
+
+      expect(vm.$el.querySelector('.dropdown-toggle-text')).toBeNull();
+      expect(vm.$el).toHaveText('Lorem Ipsum Dolar');
+    });
+  });
+});