1 files changed, 95 insertions, 0 deletions
diff --git a/spec/frontend/vue_shared/components/sidebar/labels_select_vue/dropdown_value_collapsed_spec.js b/spec/frontend/vue_shared/components/sidebar/labels_select_vue/dropdown_value_collapsed_spec.js
new file mode 100644
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+++ b/spec/frontend/vue_shared/components/sidebar/labels_select_vue/dropdown_value_collapsed_spec.js
@@ -0,0 +1,95 @@
+import Vue from 'vue';
+
+import mountComponent from 'helpers/vue_mount_component_helper';
+import dropdownValueCollapsedComponent from '~/vue_shared/components/sidebar/labels_select_vue/dropdown_value_collapsed.vue';
+
+import { mockCollapsedLabels as mockLabels } from './mock_data';
+
+const createComponent = (labels = mockLabels) => {
+  const Component = Vue.extend(dropdownValueCollapsedComponent);
+
+  return mountComponent(Component, {
+    labels,
+  });
+};
+
+describe('DropdownValueCollapsedComponent', () => {
+  let vm;
+
+  beforeEach(() => {
+    vm = createComponent();
+  });
+
+  afterEach(() => {
+    vm.$destroy();
+  });
+
+  describe('computed', () => {
+    describe('labelsList', () => {
+      it('returns default text when `labels` prop is empty array', () => {
+        const vmEmptyLabels = createComponent([]);
+
+        expect(vmEmptyLabels.labelsList).toBe('Labels');
+        vmEmptyLabels.$destroy();
+      });
+
+      it('returns labels names separated by coma when `labels` prop has more than one item', () => {
+        const labels = mockLabels.concat(mockLabels);
+        const vmMoreLabels = createComponent(labels);
+
+        const expectedText = labels.map((label) => label.title).join(', ');
+
+        expect(vmMoreLabels.labelsList).toBe(expectedText);
+        vmMoreLabels.$destroy();
+      });
+
+      it('returns labels names separated by coma with remaining labels count and `and more` phrase when `labels` prop has more than five items', () => {
+        const mockMoreLabels = Object.assign([], mockLabels);
+        for (let i = 0; i < 6; i += 1) {
+          mockMoreLabels.unshift(mockLabels[0]);
+        }
+
+        const vmMoreLabels = createComponent(mockMoreLabels);
+
+        const expectedText = `${mockMoreLabels
+          .slice(0, 5)
+          .map((label) => label.title)
+          .join(', ')}, and ${mockMoreLabels.length - 5} more`;
+
+        expect(vmMoreLabels.labelsList).toBe(expectedText);
+        vmMoreLabels.$destroy();
+      });
+
+      it('returns first label name when `labels` prop has only one item present', () => {
+        const text = mockLabels.map((label) => label.title).join(', ');
+
+        expect(vm.labelsList).toBe(text);
+      });
+    });
+  });
+
+  describe('methods', () => {
+    describe('handleClick', () => {
+      it('emits onValueClick event on component', () => {
+        jest.spyOn(vm, '$emit').mockImplementation(() => {});
+        vm.handleClick();
+
+        expect(vm.$emit).toHaveBeenCalledWith('onValueClick');
+      });
+    });
+  });
+
+  describe('template', () => {
+    it('renders component container element with tooltip`', () => {
+      expect(vm.$el.title).toBe(vm.labelsList);
+    });
+
+    it('renders tags icon element', () => {
+      expect(vm.$el.querySelector('[data-testid="labels-icon"]')).not.toBeNull();
+    });
+
+    it('renders labels count', () => {
+      expect(vm.$el.querySelector('span').innerText.trim()).toBe(`${vm.labels.length}`);
+    });
+  });
+});