1 files changed, 104 insertions, 0 deletions
diff --git a/spec/frontend/merge_requests/components/compare_dropdown_spec.js b/spec/frontend/merge_requests/components/compare_dropdown_spec.js
new file mode 100644
index 00000000000..ab5c315816c
--- /dev/null
+++ b/spec/frontend/merge_requests/components/compare_dropdown_spec.js
@@ -0,0 +1,104 @@
+import { mount } from '@vue/test-utils';
+import { GlCollapsibleListbox } from '@gitlab/ui';
+import MockAdapter from 'axios-mock-adapter';
+import waitForPromises from 'helpers/wait_for_promises';
+import axios from '~/lib/utils/axios_utils';
+import { HTTP_STATUS_OK } from '~/lib/utils/http_status';
+import CompareDropdown from '~/merge_requests/components/compare_dropdown.vue';
+
+let wrapper;
+let mock;
+
+function factory(propsData = {}) {
+  wrapper = mount(CompareDropdown, {
+    propsData: {
+      endpoint: '/gitlab-org/gitlab/target_projects',
+      default: { value: 1, text: 'gitlab-org/gitlab' },
+      dropdownHeader: 'Select',
+      inputId: 'input_id',
+      inputName: 'input_name',
+      isProject: true,
+      ...propsData,
+    },
+  });
+}
+
+const findDropdown = () => wrapper.findComponent(GlCollapsibleListbox);
+
+describe('Merge requests compare dropdown component', () => {
+  beforeEach(() => {
+    mock = new MockAdapter(axios);
+    mock.onGet('/gitlab-org/gitlab/target_projects').reply(HTTP_STATUS_OK, [
+      {
+        id: 10,
+        name: 'Gitlab Test',
+        full_path: '/root/gitlab-test',
+        full_name: 'Administrator / Gitlab Test',
+        refs_url: '/root/gitlab-test/refs',
+      },
+      {
+        id: 1,
+        name: 'Gitlab Test',
+        full_path: '/gitlab-org/gitlab-test',
+        full_name: 'Gitlab Org / Gitlab Test',
+        refs_url: '/gitlab-org/gitlab-test/refs',
+      },
+    ]);
+  });
+
+  afterEach(() => {
+    wrapper.destroy();
+    mock.restore();
+  });
+
+  it('creates hidden input with currentProject ID', () => {
+    factory();
+
+    expect(wrapper.find('[data-testid="target-project-input"]').attributes('value')).toBe('1');
+  });
+
+  it('renders list of projects', async () => {
+    factory();
+
+    wrapper.find('[data-testid="base-dropdown-toggle"]').trigger('click');
+
+    await waitForPromises();
+
+    expect(wrapper.findAll('li').length).toBe(2);
+    expect(wrapper.findAll('li').at(0).text()).toBe('root/gitlab-test');
+    expect(wrapper.findAll('li').at(1).text()).toBe('gitlab-org/gitlab-test');
+  });
+
+  it('searches projects', async () => {
+    factory();
+
+    wrapper.find('[data-testid="base-dropdown-toggle"]').trigger('click');
+
+    await waitForPromises();
+
+    findDropdown().vm.$emit('search', 'test');
+
+    jest.advanceTimersByTime(500);
+    await waitForPromises();
+
+    expect(mock.history.get[1].params).toEqual({ search: 'test' });
+  });
+
+  it('renders static data', async () => {
+    factory({
+      endpoint: undefined,
+      staticData: [
+        {
+          value: '10',
+          text: 'GitLab Org',
+        },
+      ],
+    });
+
+    wrapper.find('[data-testid="base-dropdown-toggle"]').trigger('click');
+
+    await waitForPromises();
+
+    expect(wrapper.findAll('li').length).toBe(1);
+  });
+});