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diff --git a/spec/frontend/boards/components/issue_time_estimate_deprecated_spec.js b/spec/frontend/boards/components/issue_time_estimate_deprecated_spec.js
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+++ b/spec/frontend/boards/components/issue_time_estimate_deprecated_spec.js
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+import { shallowMount } from '@vue/test-utils';
+import IssueTimeEstimate from '~/boards/components/issue_time_estimate_deprecated.vue';
+import boardsStore from '~/boards/stores/boards_store';
+
+describe('Issue Time Estimate component', () => {
+  let wrapper;
+
+  beforeEach(() => {
+    boardsStore.create();
+  });
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  describe('when limitToHours is false', () => {
+    beforeEach(() => {
+      boardsStore.timeTracking.limitToHours = false;
+      wrapper = shallowMount(IssueTimeEstimate, {
+        propsData: {
+          estimate: 374460,
+        },
+      });
+    });
+
+    it('renders the correct time estimate', () => {
+      expect(wrapper.find('time').text().trim()).toEqual('2w 3d 1m');
+    });
+
+    it('renders expanded time estimate in tooltip', () => {
+      expect(wrapper.find('.js-issue-time-estimate').text()).toContain('2 weeks 3 days 1 minute');
+    });
+
+    it('prevents tooltip xss', (done) => {
+      const alertSpy = jest.spyOn(window, 'alert');
+      wrapper.setProps({ estimate: 'Foo <script>alert("XSS")</script>' });
+      wrapper.vm.$nextTick(() => {
+        expect(alertSpy).not.toHaveBeenCalled();
+        expect(wrapper.find('time').text().trim()).toEqual('0m');
+        expect(wrapper.find('.js-issue-time-estimate').text()).toContain('0m');
+        done();
+      });
+    });
+  });
+
+  describe('when limitToHours is true', () => {
+    beforeEach(() => {
+      boardsStore.timeTracking.limitToHours = true;
+      wrapper = shallowMount(IssueTimeEstimate, {
+        propsData: {
+          estimate: 374460,
+        },
+      });
+    });
+
+    it('renders the correct time estimate', () => {
+      expect(wrapper.find('time').text().trim()).toEqual('104h 1m');
+    });
+
+    it('renders expanded time estimate in tooltip', () => {
+      expect(wrapper.find('.js-issue-time-estimate').text()).toContain('104 hours 1 minute');
+    });
+  });
+});