1 files changed, 154 insertions, 0 deletions
diff --git a/spec/frontend/boards/project_select_spec.js b/spec/frontend/boards/project_select_spec.js
new file mode 100644
index 00000000000..14ddab3542b
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+++ b/spec/frontend/boards/project_select_spec.js
@@ -0,0 +1,154 @@
+import Vuex from 'vuex';
+import { createLocalVue, mount } from '@vue/test-utils';
+import { GlDropdown, GlDropdownItem, GlSearchBoxByType, GlLoadingIcon } from '@gitlab/ui';
+import defaultState from '~/boards/stores/state';
+
+import ProjectSelect from '~/boards/components/project_select.vue';
+
+import { mockList, mockGroupProjects } from './mock_data';
+
+const localVue = createLocalVue();
+localVue.use(Vuex);
+
+const actions = {
+  fetchGroupProjects: jest.fn(),
+  setSelectedProject: jest.fn(),
+};
+
+const createStore = (state = defaultState) => {
+  return new Vuex.Store({
+    state,
+    actions,
+  });
+};
+
+const mockProjectsList1 = mockGroupProjects.slice(0, 1);
+
+describe('ProjectSelect component', () => {
+  let wrapper;
+
+  const findLabel = () => wrapper.find("[data-testid='header-label']");
+  const findGlDropdown = () => wrapper.find(GlDropdown);
+  const findGlDropdownLoadingIcon = () =>
+    findGlDropdown().find('button:first-child').find(GlLoadingIcon);
+  const findGlSearchBoxByType = () => wrapper.find(GlSearchBoxByType);
+  const findGlDropdownItems = () => wrapper.findAll(GlDropdownItem);
+  const findFirstGlDropdownItem = () => findGlDropdownItems().at(0);
+  const findInMenuLoadingIcon = () => wrapper.find("[data-testid='dropdown-text-loading-icon']");
+  const findEmptySearchMessage = () => wrapper.find("[data-testid='empty-result-message']");
+
+  const createWrapper = (state = {}) => {
+    const store = createStore({
+      groupProjects: [],
+      groupProjectsFlags: {
+        isLoading: false,
+        pageInfo: {
+          hasNextPage: false,
+        },
+      },
+      ...state,
+    });
+
+    wrapper = mount(ProjectSelect, {
+      localVue,
+      propsData: {
+        list: mockList,
+      },
+      store,
+      provide: {
+        groupId: 1,
+      },
+    });
+  };
+
+  afterEach(() => {
+    wrapper.destroy();
+    wrapper = null;
+  });
+
+  it('displays a header title', () => {
+    createWrapper();
+
+    expect(findLabel().text()).toBe('Projects');
+  });
+
+  it('renders a default dropdown text', () => {
+    createWrapper();
+
+    expect(findGlDropdown().exists()).toBe(true);
+    expect(findGlDropdown().text()).toContain('Select a project');
+  });
+
+  describe('when mounted', () => {
+    it('displays a loading icon while projects are being fetched', async () => {
+      createWrapper();
+
+      expect(findGlDropdownLoadingIcon().exists()).toBe(true);
+
+      await wrapper.vm.$nextTick();
+
+      expect(findGlDropdownLoadingIcon().exists()).toBe(false);
+    });
+  });
+
+  describe('when dropdown menu is open', () => {
+    describe('by default', () => {
+      beforeEach(() => {
+        createWrapper({ groupProjects: mockGroupProjects });
+      });
+
+      it('shows GlSearchBoxByType with default attributes', () => {
+        expect(findGlSearchBoxByType().exists()).toBe(true);
+        expect(findGlSearchBoxByType().vm.$attrs).toMatchObject({
+          placeholder: 'Search projects',
+          debounce: '250',
+        });
+      });
+
+      it("displays the fetched project's name", () => {
+        expect(findFirstGlDropdownItem().exists()).toBe(true);
+        expect(findFirstGlDropdownItem().text()).toContain(mockProjectsList1[0].name);
+      });
+
+      it("doesn't render loading icon in the menu", () => {
+        expect(findInMenuLoadingIcon().isVisible()).toBe(false);
+      });
+
+      it('does not render empty search result message', () => {
+        expect(findEmptySearchMessage().exists()).toBe(false);
+      });
+    });
+
+    describe('when no projects are being returned', () => {
+      it('renders empty search result message', () => {
+        createWrapper();
+
+        expect(findEmptySearchMessage().exists()).toBe(true);
+      });
+    });
+
+    describe('when a project is selected', () => {
+      beforeEach(() => {
+        createWrapper({ groupProjects: mockProjectsList1 });
+
+        findFirstGlDropdownItem().find('button').trigger('click');
+      });
+
+      it('renders the name of the selected project', () => {
+        expect(findGlDropdown().find('.gl-new-dropdown-button-text').text()).toBe(
+          mockProjectsList1[0].name,
+        );
+      });
+    });
+
+    describe('when projects are loading', () => {
+      beforeEach(() => {
+        createWrapper({ groupProjectsFlags: { isLoading: true } });
+      });
+
+      it('displays and hides gl-loading-icon while and after fetching data', () => {
+        expect(findInMenuLoadingIcon().isVisible()).toBe(true);
+      });
+    });
+  });
+});