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diff --git a/spec/frontend/environments/environments_app_spec.js b/spec/frontend/environments/environments_app_spec.js
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index 00000000000..f3d2bd2462e
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+++ b/spec/frontend/environments/environments_app_spec.js
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+import { mount, shallowMount } from '@vue/test-utils';
+import axios from '~/lib/utils/axios_utils';
+import MockAdapter from 'axios-mock-adapter';
+import Container from '~/environments/components/container.vue';
+import EmptyState from '~/environments/components/empty_state.vue';
+import EnvironmentsApp from '~/environments/components/environments_app.vue';
+import { environment, folder } from './mock_data';
+
+describe('Environment', () => {
+  let mock;
+  let wrapper;
+
+  const mockData = {
+    endpoint: 'environments.json',
+    canCreateEnvironment: true,
+    canReadEnvironment: true,
+    newEnvironmentPath: 'environments/new',
+    helpPagePath: 'help',
+    canaryDeploymentFeatureId: 'canary_deployment',
+    showCanaryDeploymentCallout: true,
+    userCalloutsPath: '/callouts',
+    lockPromotionSvgPath: '/assets/illustrations/lock-promotion.svg',
+    helpCanaryDeploymentsPath: 'help/canary-deployments',
+  };
+
+  const mockRequest = (response, body) => {
+    mock.onGet(mockData.endpoint).reply(response, body, {
+      'X-nExt-pAge': '2',
+      'x-page': '1',
+      'X-Per-Page': '1',
+      'X-Prev-Page': '',
+      'X-TOTAL': '37',
+      'X-Total-Pages': '2',
+    });
+  };
+
+  const createWrapper = (shallow = false) => {
+    const fn = shallow ? shallowMount : mount;
+    wrapper = fn(EnvironmentsApp, { propsData: mockData });
+    return axios.waitForAll();
+  };
+
+  beforeEach(() => {
+    mock = new MockAdapter(axios);
+  });
+
+  afterEach(() => {
+    wrapper.destroy();
+    mock.restore();
+  });
+
+  describe('successful request', () => {
+    describe('without environments', () => {
+      beforeEach(() => {
+        mockRequest(200, { environments: [] });
+        return createWrapper(true);
+      });
+
+      it('should render the empty state', () => {
+        expect(wrapper.find(EmptyState).exists()).toBe(true);
+      });
+
+      describe('when it is possible to enable a review app', () => {
+        beforeEach(() => {
+          mockRequest(200, { environments: [], review_app: { can_setup_review_app: true } });
+          return createWrapper();
+        });
+
+        it('should render the enable review app button', () => {
+          expect(wrapper.find('.js-enable-review-app-button').text()).toContain(
+            'Enable review app',
+          );
+        });
+      });
+    });
+
+    describe('with paginated environments', () => {
+      const environmentList = [environment];
+
+      beforeEach(() => {
+        mockRequest(200, {
+          environments: environmentList,
+          stopped_count: 1,
+          available_count: 0,
+        });
+        return createWrapper();
+      });
+
+      it('should render a conatiner table with environments', () => {
+        const containerTable = wrapper.find(Container);
+
+        expect(containerTable.exists()).toBe(true);
+        expect(containerTable.props('environments').length).toEqual(environmentList.length);
+        expect(containerTable.find('.environment-name').text()).toEqual(environmentList[0].name);
+      });
+
+      describe('pagination', () => {
+        it('should render pagination', () => {
+          expect(wrapper.findAll('.gl-pagination li').length).toEqual(9);
+        });
+
+        it('should make an API request when page is clicked', () => {
+          jest.spyOn(wrapper.vm, 'updateContent').mockImplementation(() => {});
+
+          wrapper.find('.gl-pagination li:nth-child(3) .page-link').trigger('click');
+          expect(wrapper.vm.updateContent).toHaveBeenCalledWith({ scope: 'available', page: '2' });
+        });
+
+        it('should make an API request when using tabs', () => {
+          jest.spyOn(wrapper.vm, 'updateContent').mockImplementation(() => {});
+          wrapper.find('.js-environments-tab-stopped').trigger('click');
+          expect(wrapper.vm.updateContent).toHaveBeenCalledWith({ scope: 'stopped', page: '1' });
+        });
+      });
+    });
+  });
+
+  describe('unsuccessful request', () => {
+    beforeEach(() => {
+      mockRequest(500, {});
+      return createWrapper(true);
+    });
+
+    it('should render empty state', () => {
+      expect(wrapper.find(EmptyState).exists()).toBe(true);
+    });
+  });
+
+  describe('expandable folders', () => {
+    beforeEach(() => {
+      mockRequest(200, {
+        environments: [folder],
+        stopped_count: 1,
+        available_count: 0,
+      });
+
+      mock.onGet(environment.folder_path).reply(200, { environments: [environment] });
+
+      return createWrapper().then(() => {
+        // open folder
+        wrapper.find('.folder-name').trigger('click');
+        return axios.waitForAll();
+      });
+    });
+
+    it('should open a closed folder', () => {
+      expect(wrapper.find('.folder-icon.ic-chevron-right').exists()).toBe(false);
+    });
+
+    it('should close an opened folder', () => {
+      expect(wrapper.find('.folder-icon.ic-chevron-down').exists()).toBe(true);
+
+      // close folder
+      wrapper.find('.folder-name').trigger('click');
+      wrapper.vm.$nextTick(() => {
+        expect(wrapper.find('.folder-icon.ic-chevron-down').exists()).toBe(false);
+      });
+    });
+
+    it('should show children environments', () => {
+      expect(wrapper.findAll('.js-child-row').length).toEqual(1);
+    });
+
+    it('should show a button to show all environments', () => {
+      expect(wrapper.find('.text-center > a.btn').text()).toContain('Show all');
+    });
+  });
+});