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+import { createLocalVue, shallowMount } from '@vue/test-utils';
+import { GlLineChart } from '@gitlab/ui/dist/charts';
+import { GlAlert } from '@gitlab/ui';
+import VueApollo from 'vue-apollo';
+import createMockApollo from 'jest/helpers/mock_apollo_helper';
+import PipelinesChart from '~/analytics/instance_statistics/components/pipelines_chart.vue';
+import pipelinesStatsQuery from '~/analytics/instance_statistics/graphql/queries/pipeline_stats.query.graphql';
+import ChartSkeletonLoader from '~/vue_shared/components/resizable_chart/skeleton_loader.vue';
+import { mockCountsData1, mockCountsData2 } from '../mock_data';
+import { getApolloResponse } from '../apollo_mock_data';
+
+const localVue = createLocalVue();
+localVue.use(VueApollo);
+
+describe('PipelinesChart', () => {
+ let wrapper;
+ let queryHandler;
+
+ const createApolloProvider = pipelineStatsHandler => {
+ return createMockApollo([[pipelinesStatsQuery, pipelineStatsHandler]]);
+ };
+
+ const createComponent = apolloProvider => {
+ return shallowMount(PipelinesChart, {
+ localVue,
+ apolloProvider,
+ });
+ };
+
+ afterEach(() => {
+ wrapper.destroy();
+ wrapper = null;
+ });
+
+ const findLoader = () => wrapper.find(ChartSkeletonLoader);
+ const findChart = () => wrapper.find(GlLineChart);
+ const findAlert = () => wrapper.find(GlAlert);
+
+ describe('while loading', () => {
+ beforeEach(() => {
+ queryHandler = jest.fn().mockReturnValue(new Promise(() => {}));
+ const apolloProvider = createApolloProvider(queryHandler);
+ wrapper = createComponent(apolloProvider);
+ });
+
+ it('requests data', () => {
+ expect(queryHandler).toBeCalledTimes(1);
+ });
+
+ it('displays the skeleton loader', () => {
+ expect(findLoader().exists()).toBe(true);
+ });
+
+ it('hides the chart', () => {
+ expect(findChart().exists()).toBe(false);
+ });
+
+ it('does not show an error', () => {
+ expect(findAlert().exists()).toBe(false);
+ });
+ });
+
+ describe('without data', () => {
+ beforeEach(() => {
+ const emptyResponse = getApolloResponse();
+ queryHandler = jest.fn().mockResolvedValue(emptyResponse);
+ const apolloProvider = createApolloProvider(queryHandler);
+ wrapper = createComponent(apolloProvider);
+ });
+
+ it('renders an no data message', () => {
+ expect(findAlert().text()).toBe('There is no data available.');
+ });
+
+ it('hides the skeleton loader', () => {
+ expect(findLoader().exists()).toBe(false);
+ });
+
+ it('renders the chart', () => {
+ expect(findChart().exists()).toBe(false);
+ });
+ });
+
+ describe('with data', () => {
+ beforeEach(() => {
+ const response = getApolloResponse({
+ pipelinesTotal: mockCountsData1,
+ pipelinesSucceeded: mockCountsData2,
+ pipelinesFailed: mockCountsData2,
+ pipelinesCanceled: mockCountsData1,
+ pipelinesSkipped: mockCountsData1,
+ });
+ queryHandler = jest.fn().mockResolvedValue(response);
+ const apolloProvider = createApolloProvider(queryHandler);
+ wrapper = createComponent(apolloProvider);
+ });
+
+ it('requests data', () => {
+ expect(queryHandler).toBeCalledTimes(1);
+ });
+
+ it('hides the skeleton loader', () => {
+ expect(findLoader().exists()).toBe(false);
+ });
+
+ it('renders the chart', () => {
+ expect(findChart().exists()).toBe(true);
+ });
+
+ it('passes the data to the line chart', () => {
+ expect(findChart().props('data')).toMatchSnapshot();
+ });
+
+ it('does not show an error', () => {
+ expect(findAlert().exists()).toBe(false);
+ });
+ });
+
+ describe('when fetching more data', () => {
+ const recordedAt = '2020-08-01';
+ describe('when the fetchMore query returns data', () => {
+ beforeEach(async () => {
+ const newData = { recordedAt, count: 5 };
+ const firstResponse = getApolloResponse({
+ pipelinesTotal: mockCountsData2,
+ pipelinesSucceeded: mockCountsData2,
+ pipelinesFailed: mockCountsData1,
+ pipelinesCanceled: mockCountsData2,
+ pipelinesSkipped: mockCountsData2,
+ hasNextPage: true,
+ });
+ const secondResponse = getApolloResponse({
+ pipelinesTotal: [newData],
+ pipelinesSucceeded: [newData],
+ pipelinesFailed: [newData],
+ pipelinesCanceled: [newData],
+ pipelinesSkipped: [newData],
+ hasNextPage: false,
+ });
+ queryHandler = jest
+ .fn()
+ .mockResolvedValueOnce(firstResponse)
+ .mockResolvedValueOnce(secondResponse);
+ const apolloProvider = createApolloProvider(queryHandler);
+ wrapper = createComponent(apolloProvider);
+
+ await wrapper.vm.$nextTick();
+ });
+
+ it('requests data twice', () => {
+ expect(queryHandler).toBeCalledTimes(2);
+ });
+
+ it('passes the data to the line chart', () => {
+ expect(findChart().props('data')).toMatchSnapshot();
+ });
+ });
+
+ describe('when the fetchMore query throws an error', () => {
+ beforeEach(async () => {
+ const response = getApolloResponse({
+ pipelinesTotal: mockCountsData2,
+ pipelinesSucceeded: mockCountsData2,
+ pipelinesFailed: mockCountsData1,
+ pipelinesCanceled: mockCountsData2,
+ pipelinesSkipped: mockCountsData2,
+ hasNextPage: true,
+ });
+ queryHandler = jest.fn().mockResolvedValue(response);
+ const apolloProvider = createApolloProvider(queryHandler);
+ wrapper = createComponent(apolloProvider);
+ jest
+ .spyOn(wrapper.vm.$apollo.queries.pipelineStats, 'fetchMore')
+ .mockImplementation(jest.fn().mockRejectedValue());
+ await wrapper.vm.$nextTick();
+ });
+
+ it('calls fetchMore', () => {
+ expect(wrapper.vm.$apollo.queries.pipelineStats.fetchMore).toHaveBeenCalledTimes(1);
+ });
+
+ it('show an error message', () => {
+ expect(findAlert().text()).toBe(
+ 'Could not load the pipelines chart. Please refresh the page to try again.',
+ );
+ });
+ });
+ });
+});