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diff --git a/spec/frontend/vue_merge_request_widget/components/mr_collapsible_extension_spec.js b/spec/frontend/vue_merge_request_widget/components/mr_collapsible_extension_spec.js
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+++ b/spec/frontend/vue_merge_request_widget/components/mr_collapsible_extension_spec.js
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+import { GlLoadingIcon, GlIcon } from '@gitlab/ui';
+import { mount } from '@vue/test-utils';
+import { nextTick } from 'vue';
+import MrCollapsibleSection from '~/vue_merge_request_widget/components/mr_collapsible_extension.vue';
+
+describe('Merge Request Collapsible Extension', () => {
+  let wrapper;
+  const data = {
+    title: 'View artifacts',
+  };
+
+  const mountComponent = (props) => {
+    wrapper = mount(MrCollapsibleSection, {
+      propsData: {
+        ...props,
+      },
+      slots: {
+        default: '<div class="js-slot">Foo</div>',
+        header: '<span data-testid="collapsed-header">hello there</span>',
+      },
+    });
+  };
+
+  const findTitle = () => wrapper.find('[data-testid="mr-collapsible-title"]');
+  const findErrorMessage = () => wrapper.find('.js-error-state');
+  const findIcon = () => wrapper.find(GlIcon);
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  describe('while collapsed', () => {
+    beforeEach(() => {
+      mountComponent(data);
+    });
+
+    it('renders provided title', () => {
+      expect(findTitle().text()).toBe(data.title);
+    });
+
+    it('renders the header slot', () => {
+      expect(wrapper.find('[data-testid="collapsed-header"]').text()).toBe('hello there');
+    });
+
+    it('renders chevron-lg-right icon', () => {
+      expect(findIcon().props('name')).toBe('chevron-lg-right');
+    });
+
+    describe('onClick', () => {
+      beforeEach(async () => {
+        wrapper.find('button').trigger('click');
+        await nextTick();
+      });
+
+      it('rendes the provided slot', () => {
+        expect(wrapper.find('.js-slot').isVisible()).toBe(true);
+      });
+
+      it('renders `Collapse` as the title', () => {
+        expect(findTitle().text()).toBe('Collapse');
+      });
+
+      it('renders chevron-lg-down icon', () => {
+        expect(findIcon().props('name')).toBe('chevron-lg-down');
+      });
+    });
+  });
+
+  describe('while loading', () => {
+    beforeEach(() => {
+      mountComponent({ ...data, isLoading: true });
+    });
+
+    it('renders the buttons disabled', () => {
+      expect(wrapper.findAll('button').at(0).attributes('disabled')).toEqual('disabled');
+      expect(wrapper.findAll('button').at(1).attributes('disabled')).toEqual('disabled');
+    });
+
+    it('renders loading spinner', () => {
+      expect(wrapper.find(GlLoadingIcon).isVisible()).toBe(true);
+    });
+  });
+
+  describe('with error', () => {
+    beforeEach(() => {
+      mountComponent({ ...data, hasError: true });
+    });
+
+    it('does not render the buttons', () => {
+      expect(wrapper.findAll('button').exists()).toBe(false);
+    });
+
+    it('renders title message provided', () => {
+      expect(findErrorMessage().text()).toBe(data.title);
+    });
+  });
+});