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diff --git a/spec/frontend/vue_mr_widget/extentions/accessibility/index_spec.js b/spec/frontend/vue_mr_widget/extentions/accessibility/index_spec.js
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+import MockAdapter from 'axios-mock-adapter';
+import { mountExtended } from 'helpers/vue_test_utils_helper';
+import { trimText } from 'helpers/text_helper';
+import waitForPromises from 'helpers/wait_for_promises';
+import axios from '~/lib/utils/axios_utils';
+import extensionsContainer from '~/vue_merge_request_widget/components/extensions/container';
+import { registerExtension } from '~/vue_merge_request_widget/components/extensions';
+import accessibilityExtension from '~/vue_merge_request_widget/extensions/accessibility';
+import httpStatusCodes from '~/lib/utils/http_status';
+import { accessibilityReportResponseErrors, accessibilityReportResponseSuccess } from './mock_data';
+
+describe('Accessibility extension', () => {
+  let wrapper;
+  let mock;
+
+  registerExtension(accessibilityExtension);
+
+  const endpoint = '/root/repo/-/merge_requests/4/accessibility_reports.json';
+
+  const mockApi = (statusCode, data) => {
+    mock.onGet(endpoint).reply(statusCode, data);
+  };
+
+  const findToggleCollapsedButton = () => wrapper.findByTestId('toggle-button');
+  const findAllExtensionListItems = () => wrapper.findAllByTestId('extension-list-item');
+
+  const createComponent = () => {
+    wrapper = mountExtended(extensionsContainer, {
+      propsData: {
+        mr: {
+          accessibilityReportPath: endpoint,
+        },
+      },
+    });
+  };
+
+  beforeEach(() => {
+    mock = new MockAdapter(axios);
+  });
+
+  afterEach(() => {
+    wrapper.destroy();
+    mock.restore();
+  });
+
+  describe('summary', () => {
+    it('displays loading text', () => {
+      mockApi(httpStatusCodes.OK, accessibilityReportResponseErrors);
+
+      createComponent();
+
+      expect(wrapper.text()).toBe('Accessibility scanning results are being parsed');
+    });
+
+    it('displays failed loading text', async () => {
+      mockApi(httpStatusCodes.INTERNAL_SERVER_ERROR);
+
+      createComponent();
+
+      await waitForPromises();
+
+      expect(wrapper.text()).toBe('Accessibility scanning failed loading results');
+    });
+
+    it('displays detected errors', async () => {
+      mockApi(httpStatusCodes.OK, accessibilityReportResponseErrors);
+
+      createComponent();
+
+      await waitForPromises();
+
+      expect(wrapper.text()).toBe(
+        'Accessibility scanning detected 8 issues for the source branch only',
+      );
+    });
+
+    it('displays no detected errors', async () => {
+      mockApi(httpStatusCodes.OK, accessibilityReportResponseSuccess);
+
+      createComponent();
+
+      await waitForPromises();
+
+      expect(wrapper.text()).toBe(
+        'Accessibility scanning detected no issues for the source branch only',
+      );
+    });
+  });
+
+  describe('expanded data', () => {
+    beforeEach(async () => {
+      mockApi(httpStatusCodes.OK, accessibilityReportResponseErrors);
+
+      createComponent();
+
+      await waitForPromises();
+
+      findToggleCollapsedButton().trigger('click');
+
+      await waitForPromises();
+    });
+
+    it('displays all report list items', async () => {
+      expect(findAllExtensionListItems()).toHaveLength(10);
+    });
+
+    it('displays report list item formatted', () => {
+      const text = {
+        newError: trimText(findAllExtensionListItems().at(0).text()),
+        resolvedError: findAllExtensionListItems().at(3).text(),
+        existingError: trimText(findAllExtensionListItems().at(8).text()),
+      };
+
+      expect(text.newError).toBe(
+        'New The accessibility scanning found an error of the following type: WCAG2AA.Principle2.Guideline2_4.2_4_1.H64.1 Learn more Message: Iframe element requires a non-empty title attribute that identifies the frame.',
+      );
+      expect(text.resolvedError).toBe(
+        'The accessibility scanning found an error of the following type: WCAG2AA.Principle1.Guideline1_1.1_1_1.H30.2 Learn more Message: Img element is the only content of the link, but is missing alt text. The alt text should describe the purpose of the link.',
+      );
+      expect(text.existingError).toBe(
+        'The accessibility scanning found an error of the following type: WCAG2AA.Principle2.Guideline2_4.2_4_1.H64.1 Learn more Message: Iframe element requires a non-empty title attribute that identifies the frame.',
+      );
+    });
+  });
+});