LabelsSelect DropdownValueCollapsed Component

app/assets/javascripts/vue_shared/components/sidebar/labels_select/dropdown_value_collapsed.vue

+<script>
+import { s__, sprintf } from '~/locale';
+import tooltip from '~/vue_shared/directives/tooltip';
+
+export default {
+  directives: {
+    tooltip,
+  },
+  props: {
+    labels: {
+      type: Array,
+      required: true,
+    },
+  },
+  computed: {
+    labelsList() {
+      const labelsString = this.labels.slice(0, 5).map(label => label.title).join(', ');
+
+      if (this.labels.length > 5) {
+        return sprintf(s__('LabelSelect|%{labelsString}, and %{remainingLabelCount} more'), {
+          labelsString,
+          remainingLabelCount: this.labels.length - 5,
+        });
+      }
+
+      return labelsString;
+    },
+  },
+};
+</script>
+
+<template>
+  <div
+    v-tooltip
+    class="sidebar-collapsed-icon"
+    data-placement="left"
+    data-container="body"
+    :title="labelsList"
+  >
+    <i
+      aria-hidden="true"
+      data-hidden="true"
+      class="fa fa-tags"
+    >
+    </i>
+    <span>{{ labels.length }}</span>
+  </div>
+</template>

spec/javascripts/vue_shared/components/sidebar/labels_select/dropdown_value_collapsed_spec.js

+import Vue from 'vue';
+
+import dropdownValueCollapsedComponent from '~/vue_shared/components/sidebar/labels_select/dropdown_value_collapsed.vue';
+
+import { mockLabels } from './mock_data';
+
+import mountComponent from '../../../../helpers/vue_mount_component_helper';
+
+const createComponent = (labels = mockLabels) => {
+  const Component = Vue.extend(dropdownValueCollapsedComponent);
+
+  return mountComponent(Component, {
+    labels,
+  });
+};
+
+describe('DropdownValueCollapsedComponent', () => {
+  let vm;
+
+  beforeEach(() => {
+    vm = createComponent();
+  });
+
+  afterEach(() => {
+    vm.$destroy();
+  });
+
+  describe('computed', () => {
+    describe('labelsList', () => {
+      it('returns empty text when `labels` prop is empty array', () => {
+        const vmEmptyLabels = createComponent([]);
+        expect(vmEmptyLabels.labelsList).toBe('');
+        vmEmptyLabels.$destroy();
+      });
+
+      it('returns labels names separated by coma when `labels` prop has more than one item', () => {
+        const vmMoreLabels = createComponent(mockLabels.concat(mockLabels));
+        expect(vmMoreLabels.labelsList).toBe('Foo Label, Foo Label');
+        vmMoreLabels.$destroy();
+      });
+
+      it('returns labels names separated by coma with remaining labels count and `and more` phrase when `labels` prop has more than five items', () => {
+        const mockMoreLabels = Object.assign([], mockLabels);
+        for (let i = 0; i < 6; i += 1) {
+          mockMoreLabels.unshift(mockLabels[0]);
+        }
+
+        const vmMoreLabels = createComponent(mockMoreLabels);
+        expect(vmMoreLabels.labelsList).toBe('Foo Label, Foo Label, Foo Label, Foo Label, Foo Label, and 2 more');
+        vmMoreLabels.$destroy();
+      });
+
+      it('returns first label name when `labels` prop has only one item present', () => {
+        expect(vm.labelsList).toBe('Foo Label');
+      });
+    });
+  });
+
+  describe('template', () => {
+    it('renders component container element with tooltip`', () => {
+      expect(vm.$el.dataset.placement).toBe('left');
+      expect(vm.$el.dataset.container).toBe('body');
+      expect(vm.$el.dataset.originalTitle).toBe(vm.labelsList);
+    });
+
+    it('renders tags icon element', () => {
+      expect(vm.$el.querySelector('.fa-tags')).not.toBeNull();
+    });
+
+    it('renders labels count', () => {
+      expect(vm.$el.querySelector('span').innerText.trim()).toBe(`${vm.labels.length}`);
+    });
+  });
+});