1 files changed, 93 insertions, 0 deletions
diff --git a/spec/frontend/notes/components/discussion_filter_note_spec.js b/spec/frontend/notes/components/discussion_filter_note_spec.js
new file mode 100644
index 00000000000..6b5f42a84e8
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+++ b/spec/frontend/notes/components/discussion_filter_note_spec.js
@@ -0,0 +1,93 @@
+import Vue from 'vue';
+import DiscussionFilterNote from '~/notes/components/discussion_filter_note.vue';
+import eventHub from '~/notes/event_hub';
+
+import mountComponent from '../../helpers/vue_mount_component_helper';
+
+describe('DiscussionFilterNote component', () => {
+  let vm;
+
+  const createComponent = () => {
+    const Component = Vue.extend(DiscussionFilterNote);
+
+    return mountComponent(Component);
+  };
+
+  beforeEach(() => {
+    vm = createComponent();
+  });
+
+  afterEach(() => {
+    vm.$destroy();
+  });
+
+  describe('computed', () => {
+    describe('timelineContent', () => {
+      it('returns string containing instruction for switching feed type', () => {
+        expect(vm.timelineContent).toBe(
+          "You're only seeing <b>other activity</b> in the feed. To add a comment, switch to one of the following options.",
+        );
+      });
+    });
+  });
+
+  describe('methods', () => {
+    describe('selectFilter', () => {
+      it('emits `dropdownSelect` event on `eventHub` with provided param', () => {
+        jest.spyOn(eventHub, '$emit').mockImplementation(() => {});
+
+        vm.selectFilter(1);
+
+        expect(eventHub.$emit).toHaveBeenCalledWith('dropdownSelect', 1);
+      });
+    });
+  });
+
+  describe('template', () => {
+    it('renders component container element', () => {
+      expect(vm.$el.classList.contains('discussion-filter-note')).toBe(true);
+    });
+
+    it('renders comment icon element', () => {
+      expect(vm.$el.querySelector('.timeline-icon svg use').getAttribute('xlink:href')).toContain(
+        'comment',
+      );
+    });
+
+    it('renders filter information note', () => {
+      expect(vm.$el.querySelector('.timeline-content').innerText.trim()).toContain(
+        "You're only seeing other activity in the feed. To add a comment, switch to one of the following options.",
+      );
+    });
+
+    it('renders filter buttons', () => {
+      const buttonsContainerEl = vm.$el.querySelector('.discussion-filter-actions');
+
+      expect(buttonsContainerEl.querySelector('button:first-child').innerText.trim()).toContain(
+        'Show all activity',
+      );
+
+      expect(buttonsContainerEl.querySelector('button:last-child').innerText.trim()).toContain(
+        'Show comments only',
+      );
+    });
+
+    it('clicking `Show all activity` button calls `selectFilter("all")` method', () => {
+      const showAllBtn = vm.$el.querySelector('.discussion-filter-actions button:first-child');
+      jest.spyOn(vm, 'selectFilter').mockImplementation(() => {});
+
+      showAllBtn.dispatchEvent(new Event('click'));
+
+      expect(vm.selectFilter).toHaveBeenCalledWith(0);
+    });
+
+    it('clicking `Show comments only` button calls `selectFilter("comments")` method', () => {
+      const showAllBtn = vm.$el.querySelector('.discussion-filter-actions button:last-child');
+      jest.spyOn(vm, 'selectFilter').mockImplementation(() => {});
+
+      showAllBtn.dispatchEvent(new Event('click'));
+
+      expect(vm.selectFilter).toHaveBeenCalledWith(1);
+    });
+  });
+});