Prevents rendering empty badge when pipeline request fails

app/assets/javascripts/pipelines/components/navigation_tabs.vue

 <script>
-export default {
+  export default {
     name: 'PipelineNavigationTabs',
     props: {
       scope: {
@@ -18,6 +18,12 @@ export default {
     mounted() {
       $(document).trigger('init.scrolling-tabs');
     },
+    methods: {
+      shouldRenderBadge(count) {
+        // 0 is valid in a badge, but evaluates to false, we need to check for undefined
+        return count !== undefined;
+      },
+    },
 };
 </script>
 <template>
@@ -27,7 +33,9 @@ export default {
       :class="{ active: scope === 'all'}">
       <a :href="paths.allPath">
         All
-        <span class="badge js-totalbuilds-count">
+        <span
+          v-if="shouldRenderBadge(count.all)"
+          class="badge js-totalbuilds-count">
           {{count.all}}
         </span>
       </a>
@@ -37,7 +45,9 @@ export default {
       :class="{ active: scope === 'pending'}">
       <a :href="paths.pendingPath">
         Pending
-        <span class="badge">
+        <span
+          v-if="shouldRenderBadge(count.pending)"
+          class="badge">
           {{count.pending}}
         </span>
       </a>
@@ -47,7 +57,9 @@ export default {
       :class="{ active: scope === 'running'}">
       <a :href="paths.runningPath">
         Running
-        <span class="badge">
+        <span
+          v-if="shouldRenderBadge(count.running)"
+          class="badge">
           {{count.running}}
         </span>
       </a>
@@ -57,7 +69,9 @@ export default {
       :class="{ active: scope === 'finished'}">
       <a :href="paths.finishedPath">
         Finished
-        <span class="badge">
+        <span
+          v-if="shouldRenderBadge(count.finished)"
+          class="badge">
           {{count.finished}}
         </span>
       </a>

changelogs/unreleased/35048-empty-badges.yml

+---
+title: Prevents rendering empty badges when request fails
+merge_request:
+author:
+type: fixed

spec/javascripts/helpers/vue_mount_component_helper.js

+export default (Component, props = {}) => new Component({
+  propsData: props,
+}).$mount();
+

spec/javascripts/pipelines/navigation_tabs_spec.js

+import Vue from 'vue';
+import navigationTabs from '~/pipelines/components/navigation_tabs.vue';
+import mountComponent from '../helpers/vue_mount_component_helper';
+
+describe('navigation tabs pipeline component', () => {
+  let vm;
+  let Component;
+  let data;
+
+  beforeEach(() => {
+    data = {
+      scope: 'all',
+      count: {
+        all: 16,
+        running: 1,
+        pending: 10,
+        finished: 0,
+      },
+      paths: {
+        allPath: '/gitlab-org/gitlab-ce/pipelines',
+        pendingPath: '/gitlab-org/gitlab-ce/pipelines?scope=pending',
+        finishedPath: '/gitlab-org/gitlab-ce/pipelines?scope=finished',
+        runningPath: '/gitlab-org/gitlab-ce/pipelines?scope=running',
+        branchesPath: '/gitlab-org/gitlab-ce/pipelines?scope=branches',
+        tagsPath: '/gitlab-org/gitlab-ce/pipelines?scope=tags',
+      },
+    };
+
+    Component = Vue.extend(navigationTabs);
+  });
+
+  afterEach(() => {
+    vm.$destroy();
+  });
+
+  it('should render tabs with correct paths', () => {
+    vm = mountComponent(Component, data);
+
+    // All
+    const allTab = vm.$el.querySelector('.js-pipelines-tab-all a');
+    expect(allTab.textContent.trim()).toContain('All');
+    expect(allTab.getAttribute('href')).toEqual(data.paths.allPath);
+
+    // Pending
+    const pendingTab = vm.$el.querySelector('.js-pipelines-tab-pending a');
+    expect(pendingTab.textContent.trim()).toContain('Pending');
+    expect(pendingTab.getAttribute('href')).toEqual(data.paths.pendingPath);
+
+    // Running
+    const runningTab = vm.$el.querySelector('.js-pipelines-tab-running a');
+    expect(runningTab.textContent.trim()).toContain('Running');
+    expect(runningTab.getAttribute('href')).toEqual(data.paths.runningPath);
+
+    // Finished
+    const finishedTab = vm.$el.querySelector('.js-pipelines-tab-finished a');
+    expect(finishedTab.textContent.trim()).toContain('Finished');
+    expect(finishedTab.getAttribute('href')).toEqual(data.paths.finishedPath);
+
+    // Branches
+    const branchesTab = vm.$el.querySelector('.js-pipelines-tab-branches a');
+    expect(branchesTab.textContent.trim()).toContain('Branches');
+
+    // Tags
+    const tagsTab = vm.$el.querySelector('.js-pipelines-tab-tags a');
+    expect(tagsTab.textContent.trim()).toContain('Tags');
+  });
+
+  describe('scope', () => {
+    it('should render scope provided as active tab', () => {
+      vm = mountComponent(Component, data);
+      expect(vm.$el.querySelector('.js-pipelines-tab-all').className).toContain('active');
+    });
+  });
+
+  describe('badges', () => {
+    it('should render provided number', () => {
+      vm = mountComponent(Component, data);
+      // All
+      expect(
+        vm.$el.querySelector('.js-totalbuilds-count').textContent.trim(),
+      ).toContain(data.count.all);
+
+      // Pending
+      expect(
+        vm.$el.querySelector('.js-pipelines-tab-pending .badge').textContent.trim(),
+      ).toContain(data.count.pending);
+
+      // Running
+      expect(
+        vm.$el.querySelector('.js-pipelines-tab-running .badge').textContent.trim(),
+      ).toContain(data.count.running);
+
+      // Finished
+      expect(
+        vm.$el.querySelector('.js-pipelines-tab-finished .badge').textContent.trim(),
+      ).toContain(data.count.finished);
+    });
+
+    it('should not render badge when number is undefined', () => {
+      vm = mountComponent(Component, {
+        scope: 'all',
+        paths: {},
+        count: {},
+      });
+
+       // All
+      expect(
+        vm.$el.querySelector('.js-totalbuilds-count'),
+      ).toEqual(null);
+
+      // Pending
+      expect(
+        vm.$el.querySelector('.js-pipelines-tab-pending .badge'),
+      ).toEqual(null);
+
+      // Running
+      expect(
+        vm.$el.querySelector('.js-pipelines-tab-running .badge'),
+      ).toEqual(null);
+
+      // Finished
+      expect(
+        vm.$el.querySelector('.js-pipelines-tab-finished .badge'),
+      ).toEqual(null);
+    });
+  });
+});