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diff --git a/spec/frontend/boards/components/board_blocked_icon_spec.js b/spec/frontend/boards/components/board_blocked_icon_spec.js
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+++ b/spec/frontend/boards/components/board_blocked_icon_spec.js
@@ -0,0 +1,226 @@
+import { GlIcon, GlLink, GlPopover, GlLoadingIcon } from '@gitlab/ui';
+import { shallowMount, mount } from '@vue/test-utils';
+import Vue from 'vue';
+import VueApollo from 'vue-apollo';
+import createMockApollo from 'helpers/mock_apollo_helper';
+import { extendedWrapper } from 'helpers/vue_test_utils_helper';
+import waitForPromises from 'helpers/wait_for_promises';
+import BoardBlockedIcon from '~/boards/components/board_blocked_icon.vue';
+import { blockingIssuablesQueries, issuableTypes } from '~/boards/constants';
+import { truncate } from '~/lib/utils/text_utility';
+import {
+  mockIssue,
+  mockBlockingIssue1,
+  mockBlockingIssue2,
+  mockBlockingIssuablesResponse1,
+  mockBlockingIssuablesResponse2,
+  mockBlockingIssuablesResponse3,
+  mockBlockedIssue1,
+  mockBlockedIssue2,
+} from '../mock_data';
+
+describe('BoardBlockedIcon', () => {
+  let wrapper;
+  let mockApollo;
+
+  const findGlIcon = () => wrapper.find(GlIcon);
+  const findGlPopover = () => wrapper.find(GlPopover);
+  const findGlLink = () => wrapper.find(GlLink);
+  const findPopoverTitle = () => wrapper.findByTestId('popover-title');
+  const findIssuableTitle = () => wrapper.findByTestId('issuable-title');
+  const findHiddenBlockingCount = () => wrapper.findByTestId('hidden-blocking-count');
+  const findViewAllIssuableLink = () => wrapper.findByTestId('view-all-issues');
+
+  const waitForApollo = async () => {
+    jest.runOnlyPendingTimers();
+    await waitForPromises();
+  };
+
+  const mouseenter = async () => {
+    findGlIcon().vm.$emit('mouseenter');
+
+    await wrapper.vm.$nextTick();
+    await waitForApollo();
+  };
+
+  afterEach(() => {
+    wrapper.destroy();
+    wrapper = null;
+  });
+
+  const createWrapperWithApollo = ({
+    item = mockBlockedIssue1,
+    blockingIssuablesSpy = jest.fn().mockResolvedValue(mockBlockingIssuablesResponse1),
+  } = {}) => {
+    mockApollo = createMockApollo([
+      [blockingIssuablesQueries[issuableTypes.issue].query, blockingIssuablesSpy],
+    ]);
+
+    Vue.use(VueApollo);
+    wrapper = extendedWrapper(
+      mount(BoardBlockedIcon, {
+        apolloProvider: mockApollo,
+        propsData: {
+          item: {
+            ...mockIssue,
+            ...item,
+          },
+          uniqueId: 'uniqueId',
+          issuableType: issuableTypes.issue,
+        },
+        attachTo: document.body,
+      }),
+    );
+  };
+
+  const createWrapper = ({ item = {}, queries = {}, data = {}, loading = false } = {}) => {
+    wrapper = extendedWrapper(
+      shallowMount(BoardBlockedIcon, {
+        propsData: {
+          item: {
+            ...mockIssue,
+            ...item,
+          },
+          uniqueId: 'uniqueid',
+          issuableType: issuableTypes.issue,
+        },
+        data() {
+          return {
+            ...data,
+          };
+        },
+        mocks: {
+          $apollo: {
+            queries: {
+              blockingIssuables: { loading },
+              ...queries,
+            },
+          },
+        },
+        stubs: {
+          GlPopover,
+        },
+        attachTo: document.body,
+      }),
+    );
+  };
+
+  it('should render blocked icon', () => {
+    createWrapper();
+
+    expect(findGlIcon().exists()).toBe(true);
+  });
+
+  it('should display a loading spinner while loading', () => {
+    createWrapper({ loading: true });
+
+    expect(wrapper.find(GlLoadingIcon).exists()).toBe(true);
+  });
+
+  it('should not query for blocking issuables by default', async () => {
+    createWrapperWithApollo();
+
+    expect(findGlPopover().text()).not.toContain(mockBlockingIssue1.title);
+  });
+
+  describe('on mouseenter on blocked icon', () => {
+    it('should query for blocking issuables and render the result', async () => {
+      createWrapperWithApollo();
+
+      expect(findGlPopover().text()).not.toContain(mockBlockingIssue1.title);
+
+      await mouseenter();
+
+      expect(findGlPopover().exists()).toBe(true);
+      expect(findIssuableTitle().text()).toContain(mockBlockingIssue1.title);
+      expect(wrapper.vm.skip).toBe(true);
+    });
+
+    it('should emit "blocking-issuables-error" event on query error', async () => {
+      const mockError = new Error('mayday');
+      createWrapperWithApollo({ blockingIssuablesSpy: jest.fn().mockRejectedValue(mockError) });
+
+      await mouseenter();
+
+      const [
+        [
+          {
+            message,
+            error: { networkError },
+          },
+        ],
+      ] = wrapper.emitted('blocking-issuables-error');
+      expect(message).toBe('Failed to fetch blocking issues');
+      expect(networkError).toBe(mockError);
+    });
+
+    describe('with a single blocking issue', () => {
+      beforeEach(async () => {
+        createWrapperWithApollo();
+
+        await mouseenter();
+      });
+
+      it('should render a title of the issuable', async () => {
+        expect(findIssuableTitle().text()).toBe(mockBlockingIssue1.title);
+      });
+
+      it('should render issuable reference and link to the issuable', async () => {
+        const formattedRef = mockBlockingIssue1.reference.split('/')[1];
+
+        expect(findGlLink().text()).toBe(formattedRef);
+        expect(findGlLink().attributes('href')).toBe(mockBlockingIssue1.webUrl);
+      });
+
+      it('should render popover title with correct blocking issuable count', async () => {
+        expect(findPopoverTitle().text()).toBe('Blocked by 1 issue');
+      });
+    });
+
+    describe('when issue has a long title', () => {
+      it('should render a truncated title', async () => {
+        createWrapperWithApollo({
+          blockingIssuablesSpy: jest.fn().mockResolvedValue(mockBlockingIssuablesResponse2),
+        });
+
+        await mouseenter();
+
+        const truncatedTitle = truncate(
+          mockBlockingIssue2.title,
+          wrapper.vm.$options.textTruncateWidth,
+        );
+        expect(findIssuableTitle().text()).toBe(truncatedTitle);
+      });
+    });
+
+    describe('with more than three blocking issues', () => {
+      beforeEach(async () => {
+        createWrapperWithApollo({
+          item: mockBlockedIssue2,
+          blockingIssuablesSpy: jest.fn().mockResolvedValue(mockBlockingIssuablesResponse3),
+        });
+
+        await mouseenter();
+      });
+
+      it('matches the snapshot', () => {
+        expect(wrapper.html()).toMatchSnapshot();
+      });
+
+      it('should render popover title with correct blocking issuable count', async () => {
+        expect(findPopoverTitle().text()).toBe('Blocked by 4 issues');
+      });
+
+      it('should render the number of hidden blocking issuables', () => {
+        expect(findHiddenBlockingCount().text()).toBe('+ 1 more issue');
+      });
+
+      it('should link to the blocked issue page at the related issue anchor', async () => {
+        expect(findViewAllIssuableLink().text()).toBe('View all blocking issues');
+        expect(findViewAllIssuableLink().attributes('href')).toBe(
+          `${mockBlockedIssue2.webUrl}#related-issues`,
+        );
+      });
+    });
+  });
+});