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diff --git a/spec/frontend/design_management_legacy/components/design_notes/toggle_replies_widget_spec.js b/spec/frontend/design_management_legacy/components/design_notes/toggle_replies_widget_spec.js
new file mode 100644
index 00000000000..acc7cbbca52
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+++ b/spec/frontend/design_management_legacy/components/design_notes/toggle_replies_widget_spec.js
@@ -0,0 +1,98 @@
+import { shallowMount } from '@vue/test-utils';
+import { GlIcon, GlButton, GlLink } from '@gitlab/ui';
+import TimeAgoTooltip from '~/vue_shared/components/time_ago_tooltip.vue';
+import ToggleRepliesWidget from '~/design_management_legacy/components/design_notes/toggle_replies_widget.vue';
+import notes from '../../mock_data/notes';
+
+describe('Toggle replies widget component', () => {
+  let wrapper;
+
+  const findToggleWrapper = () => wrapper.find('[data-testid="toggle-comments-wrapper"]');
+  const findIcon = () => wrapper.find(GlIcon);
+  const findButton = () => wrapper.find(GlButton);
+  const findAuthorLink = () => wrapper.find(GlLink);
+  const findTimeAgo = () => wrapper.find(TimeAgoTooltip);
+
+  function createComponent(props = {}) {
+    wrapper = shallowMount(ToggleRepliesWidget, {
+      propsData: {
+        collapsed: true,
+        replies: notes,
+        ...props,
+      },
+    });
+  }
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  describe('when replies are collapsed', () => {
+    beforeEach(() => {
+      createComponent();
+    });
+
+    it('should not have expanded class', () => {
+      expect(findToggleWrapper().classes()).not.toContain('expanded');
+    });
+
+    it('should render chevron-right icon', () => {
+      expect(findIcon().props('name')).toBe('chevron-right');
+    });
+
+    it('should have replies length on button', () => {
+      expect(findButton().text()).toBe('2 replies');
+    });
+
+    it('should render a link to the last reply author', () => {
+      expect(findAuthorLink().exists()).toBe(true);
+      expect(findAuthorLink().text()).toBe(notes[1].author.name);
+      expect(findAuthorLink().attributes('href')).toBe(notes[1].author.webUrl);
+    });
+
+    it('should render correct time ago tooltip', () => {
+      expect(findTimeAgo().exists()).toBe(true);
+      expect(findTimeAgo().props('time')).toBe(notes[1].createdAt);
+    });
+  });
+
+  describe('when replies are expanded', () => {
+    beforeEach(() => {
+      createComponent({ collapsed: false });
+    });
+
+    it('should have expanded class', () => {
+      expect(findToggleWrapper().classes()).toContain('expanded');
+    });
+
+    it('should render chevron-down icon', () => {
+      expect(findIcon().props('name')).toBe('chevron-down');
+    });
+
+    it('should have Collapse replies text on button', () => {
+      expect(findButton().text()).toBe('Collapse replies');
+    });
+
+    it('should not have a link to the last reply author', () => {
+      expect(findAuthorLink().exists()).toBe(false);
+    });
+
+    it('should not render time ago tooltip', () => {
+      expect(findTimeAgo().exists()).toBe(false);
+    });
+  });
+
+  it('should emit toggle event on icon click', () => {
+    createComponent();
+    findIcon().vm.$emit('click', new MouseEvent('click'));
+
+    expect(wrapper.emitted('toggle')).toHaveLength(1);
+  });
+
+  it('should emit toggle event on button click', () => {
+    createComponent();
+    findButton().vm.$emit('click', new MouseEvent('click'));
+
+    expect(wrapper.emitted('toggle')).toHaveLength(1);
+  });
+});