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diff --git a/spec/frontend/vue_shared/alert_details/alert_management_sidebar_todo_spec.js b/spec/frontend/vue_shared/alert_details/alert_management_sidebar_todo_spec.js
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+++ b/spec/frontend/vue_shared/alert_details/alert_management_sidebar_todo_spec.js
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+import { mount } from '@vue/test-utils';
+import todoMarkDoneMutation from '~/graphql_shared/mutations/todo_mark_done.mutation.graphql';
+import SidebarTodo from '~/vue_shared/alert_details/components/sidebar/sidebar_todo.vue';
+import createAlertTodoMutation from '~/vue_shared/alert_details/graphql/mutations/alert_todo_create.mutation.graphql';
+import mockAlerts from './mocks/alerts.json';
+
+const mockAlert = mockAlerts[0];
+
+describe('Alert Details Sidebar To Do', () => {
+  let wrapper;
+
+  function mountComponent({ data, sidebarCollapsed = true, loading = false, stubs = {} } = {}) {
+    wrapper = mount(SidebarTodo, {
+      propsData: {
+        alert: { ...mockAlert },
+        ...data,
+        sidebarCollapsed,
+        projectPath: 'projectPath',
+      },
+      mocks: {
+        $apollo: {
+          mutate: jest.fn(),
+          queries: {
+            alert: {
+              loading,
+            },
+          },
+        },
+      },
+      stubs,
+    });
+  }
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  const findToDoButton = () => wrapper.find('[data-testid="alert-todo-button"]');
+
+  describe('updating the alert to do', () => {
+    const mockUpdatedMutationResult = {
+      data: {
+        updateAlertTodo: {
+          errors: [],
+          alert: {},
+        },
+      },
+    };
+
+    describe('adding a todo', () => {
+      beforeEach(() => {
+        mountComponent({
+          data: { alert: mockAlert },
+          sidebarCollapsed: false,
+          loading: false,
+        });
+      });
+
+      it('renders a button for adding a To-Do', async () => {
+        await wrapper.vm.$nextTick();
+
+        expect(findToDoButton().text()).toBe('Add a to do');
+      });
+
+      it('calls `$apollo.mutate` with `createAlertTodoMutation` mutation and variables containing `iid`, `todoEvent`, & `projectPath`', async () => {
+        jest.spyOn(wrapper.vm.$apollo, 'mutate').mockResolvedValue(mockUpdatedMutationResult);
+
+        findToDoButton().trigger('click');
+        await wrapper.vm.$nextTick();
+
+        expect(wrapper.vm.$apollo.mutate).toHaveBeenCalledWith({
+          mutation: createAlertTodoMutation,
+          variables: {
+            iid: '1527542',
+            projectPath: 'projectPath',
+          },
+        });
+      });
+    });
+
+    describe('removing a todo', () => {
+      beforeEach(() => {
+        mountComponent({
+          data: { alert: { ...mockAlert, todos: { nodes: [{ id: '1234' }] } } },
+          sidebarCollapsed: false,
+          loading: false,
+        });
+      });
+
+      it('renders a Mark As Done button when todo is present', async () => {
+        await wrapper.vm.$nextTick();
+
+        expect(findToDoButton().text()).toBe('Mark as done');
+      });
+
+      it('calls `$apollo.mutate` with `todoMarkDoneMutation` mutation and variables containing `id`', async () => {
+        jest.spyOn(wrapper.vm.$apollo, 'mutate').mockResolvedValue(mockUpdatedMutationResult);
+
+        findToDoButton().trigger('click');
+        await wrapper.vm.$nextTick();
+
+        expect(wrapper.vm.$apollo.mutate).toHaveBeenCalledWith({
+          mutation: todoMarkDoneMutation,
+          update: expect.anything(),
+          variables: {
+            id: '1234',
+          },
+        });
+      });
+    });
+  });
+});