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diff --git a/spec/frontend/sidebar/components/copy/sidebar_reference_widget_spec.js b/spec/frontend/sidebar/components/copy/sidebar_reference_widget_spec.js
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+++ b/spec/frontend/sidebar/components/copy/sidebar_reference_widget_spec.js
@@ -0,0 +1,93 @@
+import { shallowMount } from '@vue/test-utils';
+import Vue from 'vue';
+import VueApollo from 'vue-apollo';
+import createMockApollo from 'helpers/mock_apollo_helper';
+import waitForPromises from 'helpers/wait_for_promises';
+import { IssuableType } from '~/issues/constants';
+import SidebarReferenceWidget from '~/sidebar/components/copy/sidebar_reference_widget.vue';
+import issueReferenceQuery from '~/sidebar/queries/issue_reference.query.graphql';
+import mergeRequestReferenceQuery from '~/sidebar/queries/merge_request_reference.query.graphql';
+import CopyableField from '~/sidebar/components/copy/copyable_field.vue';
+import { issueReferenceResponse } from '../../mock_data';
+
+describe('Sidebar Reference Widget', () => {
+  let wrapper;
+  let fakeApollo;
+
+  const mockReferenceValue = 'reference-1234';
+
+  const findCopyableField = () => wrapper.findComponent(CopyableField);
+
+  const createComponent = ({
+    issuableType = IssuableType.Issue,
+    referenceQuery = issueReferenceQuery,
+    referenceQueryHandler = jest.fn().mockResolvedValue(issueReferenceResponse(mockReferenceValue)),
+  } = {}) => {
+    Vue.use(VueApollo);
+
+    fakeApollo = createMockApollo([[referenceQuery, referenceQueryHandler]]);
+
+    wrapper = shallowMount(SidebarReferenceWidget, {
+      apolloProvider: fakeApollo,
+      provide: {
+        fullPath: 'group/project',
+        iid: '1',
+      },
+      propsData: {
+        issuableType,
+      },
+    });
+  };
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  describe('when reference is loading', () => {
+    it('sets CopyableField `is-loading` prop to `true`', () => {
+      createComponent({ referenceQueryHandler: jest.fn().mockReturnValue(new Promise(() => {})) });
+      expect(findCopyableField().props('isLoading')).toBe(true);
+    });
+  });
+
+  describe.each([
+    [IssuableType.Issue, issueReferenceQuery],
+    [IssuableType.MergeRequest, mergeRequestReferenceQuery],
+  ])('when issuableType is %s', (issuableType, referenceQuery) => {
+    it('sets CopyableField `value` prop to reference value', async () => {
+      createComponent({
+        issuableType,
+        referenceQuery,
+      });
+
+      await waitForPromises();
+
+      expect(findCopyableField().props('value')).toBe(mockReferenceValue);
+    });
+
+    describe('when error occurs', () => {
+      it('calls createFlash with correct parameters', async () => {
+        const mockError = new Error('mayday');
+
+        createComponent({
+          issuableType,
+          referenceQuery,
+          referenceQueryHandler: jest.fn().mockRejectedValue(mockError),
+        });
+
+        await waitForPromises();
+
+        const [
+          [
+            {
+              message,
+              error: { networkError },
+            },
+          ],
+        ] = wrapper.emitted('fetch-error');
+        expect(message).toBe('An error occurred while fetching reference');
+        expect(networkError).toEqual(mockError);
+      });
+    });
+  });
+});