Add tests for links inner component

This add tests for the link drawing in the CI
config graph.

app/assets/javascripts/pipelines/components/graph_shared/drawing_utils.js

@@ -40,10 +40,10 @@ export const generateLinksData = ({ links }, containerID, modifier = '') => {
     // positioned in the center of the job node by adding half the height
     // of the job pill.
     const paddingLeft = parseFloat(
-      window.getComputedStyle(containerEl, null).getPropertyValue('padding-left'),
+      window.getComputedStyle(containerEl, null).getPropertyValue('padding-left') || 0,
     );
     const paddingTop = parseFloat(
-      window.getComputedStyle(containerEl, null).getPropertyValue('padding-top'),
+      window.getComputedStyle(containerEl, null).getPropertyValue('padding-top') || 0,
     );
 
     const sourceNodeX = sourceNodeCoordinates.right - containerCoordinates.x - paddingLeft;

spec/frontend/pipelines/graph_shared/__snapshots__/links_inner_spec.js.snap

+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Links Inner component with a large number of needs matches snapshot and has expected path 1`] = `
+"<div class=\\"gl-display-flex gl-relative\\"><svg id=\\"link-svg\\" viewBox=\\"0,0,1019,445\\" width=\\"1019px\\" height=\\"445px\\" class=\\"gl-absolute\\">
+    <path d=\\"M202,118L42,118C72,118,72,138,102,138\\" stroke-width=\\"2\\" class=\\"gl-fill-transparent gl-transition-duration-slow gl-transition-timing-function-ease gl-stroke-gray-200\\"></path>
+    <path d=\\"M202,118L52,118C82,118,82,148,112,148\\" stroke-width=\\"2\\" class=\\"gl-fill-transparent gl-transition-duration-slow gl-transition-timing-function-ease gl-stroke-gray-200\\"></path>
+    <path d=\\"M222,138L62,138C92,138,92,158,122,158\\" stroke-width=\\"2\\" class=\\"gl-fill-transparent gl-transition-duration-slow gl-transition-timing-function-ease gl-stroke-gray-200\\"></path>
+    <path d=\\"M212,128L72,128C102,128,102,168,132,168\\" stroke-width=\\"2\\" class=\\"gl-fill-transparent gl-transition-duration-slow gl-transition-timing-function-ease gl-stroke-gray-200\\"></path>
+    <path d=\\"M232,148L82,148C112,148,112,178,142,178\\" stroke-width=\\"2\\" class=\\"gl-fill-transparent gl-transition-duration-slow gl-transition-timing-function-ease gl-stroke-gray-200\\"></path>
+  </svg> </div>"
+`;
+
+exports[`Links Inner component with a parallel need matches snapshot and has expected path 1`] = `
+"<div class=\\"gl-display-flex gl-relative\\"><svg id=\\"link-svg\\" viewBox=\\"0,0,1019,445\\" width=\\"1019px\\" height=\\"445px\\" class=\\"gl-absolute\\">
+    <path d=\\"M192,108L22,108C52,108,52,118,82,118\\" stroke-width=\\"2\\" class=\\"gl-fill-transparent gl-transition-duration-slow gl-transition-timing-function-ease gl-stroke-gray-200\\"></path>
+  </svg> </div>"
+`;
+
+exports[`Links Inner component with one need matches snapshot and has expected path 1`] = `
+"<div class=\\"gl-display-flex gl-relative\\"><svg id=\\"link-svg\\" viewBox=\\"0,0,1019,445\\" width=\\"1019px\\" height=\\"445px\\" class=\\"gl-absolute\\">
+    <path d=\\"M202,118L42,118C72,118,72,138,102,138\\" stroke-width=\\"2\\" class=\\"gl-fill-transparent gl-transition-duration-slow gl-transition-timing-function-ease gl-stroke-gray-200\\"></path>
+  </svg> </div>"
+`;

spec/frontend/pipelines/graph_shared/links_inner_spec.js

+import { shallowMount } from '@vue/test-utils';
+import { setHTMLFixture } from 'helpers/fixtures';
+import LinksInner from '~/pipelines/components/graph_shared/links_inner.vue';
+import { createJobsHash } from '~/pipelines/utils';
+import {
+  jobRect,
+  largePipelineData,
+  parallelNeedData,
+  pipelineData,
+  pipelineDataWithNoNeeds,
+  rootRect,
+} from '../pipeline_graph/mock_data';
+
+describe('Links Inner component', () => {
+  const containerId = 'pipeline-graph-container';
+  const defaultProps = {
+    containerId,
+    containerMeasurements: { width: 1019, height: 445 },
+    pipelineId: 1,
+    pipelineData: [],
+  };
+  let wrapper;
+
+  const createComponent = (props) => {
+    wrapper = shallowMount(LinksInner, {
+      propsData: { ...defaultProps, ...props },
+    });
+  };
+
+  const findLinkSvg = () => wrapper.find('#link-svg');
+  const findAllLinksPath = () => findLinkSvg().findAll('path');
+
+  // We create fixture so that each job has an empty div that represent
+  // the JobPill in the DOM. Each `JobPill` would have different coordinates,
+  // so we increment their coordinates on each iteration to simulat different positions.
+  const setFixtures = ({ stages }) => {
+    const jobs = createJobsHash(stages);
+    const arrayOfJobs = Object.keys(jobs);
+
+    const linksHtmlElements = arrayOfJobs.map((job) => {
+      return `<div id=${job}-${defaultProps.pipelineId} />`;
+    });
+
+    setHTMLFixture(`<div id="${containerId}">${linksHtmlElements.join(' ')}</div>`);
+
+    // We are mocking the clientRect data of each job and the container ID.
+    jest
+      .spyOn(document.getElementById(containerId), 'getBoundingClientRect')
+      .mockImplementation(() => rootRect);
+
+    arrayOfJobs.forEach((job, index) => {
+      jest
+        .spyOn(
+          document.getElementById(`${job}-${defaultProps.pipelineId}`),
+          'getBoundingClientRect',
+        )
+        .mockImplementation(() => {
+          const newValue = 10 * index;
+          const { left, right, top, bottom, x, y } = jobRect;
+          return {
+            ...jobRect,
+            left: left + newValue,
+            right: right + newValue,
+            top: top + newValue,
+            bottom: bottom + newValue,
+            x: x + newValue,
+            y: y + newValue,
+          };
+        });
+    });
+  };
+
+  afterEach(() => {
+    jest.restoreAllMocks();
+    wrapper.destroy();
+    wrapper = null;
+  });
+
+  describe('basic SVG creation', () => {
+    beforeEach(() => {
+      createComponent();
+    });
+
+    it('renders an SVG of the right size', () => {
+      expect(findLinkSvg().exists()).toBe(true);
+      expect(findLinkSvg().attributes('width')).toBe(
+        `${defaultProps.containerMeasurements.width}px`,
+      );
+      expect(findLinkSvg().attributes('height')).toBe(
+        `${defaultProps.containerMeasurements.height}px`,
+      );
+    });
+  });
+
+  describe('no pipeline data', () => {
+    beforeEach(() => {
+      createComponent();
+    });
+
+    it('renders the component', () => {
+      expect(findLinkSvg().exists()).toBe(true);
+      expect(findAllLinksPath()).toHaveLength(0);
+    });
+  });
+
+  describe('pipeline data with no needs', () => {
+    beforeEach(() => {
+      createComponent({ pipelineData: pipelineDataWithNoNeeds.stages });
+    });
+
+    it('renders no links', () => {
+      expect(findLinkSvg().exists()).toBe(true);
+      expect(findAllLinksPath()).toHaveLength(0);
+    });
+  });
+
+  describe('with one need', () => {
+    beforeEach(() => {
+      setFixtures(pipelineData);
+      createComponent({ pipelineData: pipelineData.stages });
+    });
+
+    it('renders one link', () => {
+      expect(findAllLinksPath()).toHaveLength(1);
+    });
+
+    it('path does not contain NaN values', () => {
+      expect(wrapper.html()).not.toContain('NaN');
+    });
+
+    it('matches snapshot and has expected path', () => {
+      expect(wrapper.html()).toMatchSnapshot();
+    });
+  });
+
+  describe('with a parallel need', () => {
+    beforeEach(() => {
+      setFixtures(parallelNeedData);
+      createComponent({ pipelineData: parallelNeedData.stages });
+    });
+
+    it('renders only one link for all the same parallel jobs', () => {
+      expect(findAllLinksPath()).toHaveLength(1);
+    });
+
+    it('path does not contain NaN values', () => {
+      expect(wrapper.html()).not.toContain('NaN');
+    });
+
+    it('matches snapshot and has expected path', () => {
+      expect(wrapper.html()).toMatchSnapshot();
+    });
+  });
+
+  describe('with a large number of needs', () => {
+    beforeEach(() => {
+      setFixtures(largePipelineData);
+      createComponent({ pipelineData: largePipelineData.stages });
+    });
+
+    it('renders the correct number of links', () => {
+      expect(findAllLinksPath()).toHaveLength(5);
+    });
+
+    it('path does not contain NaN values', () => {
+      expect(wrapper.html()).not.toContain('NaN');
+    });
+
+    it('matches snapshot and has expected path', () => {
+      expect(wrapper.html()).toMatchSnapshot();
+    });
+  });
+
+  describe('interactions', () => {
+    beforeEach(() => {
+      setFixtures(largePipelineData);
+      createComponent({ pipelineData: largePipelineData.stages });
+    });
+
+    it('highlight needs on hover', async () => {
+      const firstLink = findAllLinksPath().at(0);
+
+      const defaultColorClass = 'gl-stroke-gray-200';
+      const hoverColorClass = 'gl-stroke-blue-400';
+
+      expect(firstLink.classes(defaultColorClass)).toBe(true);
+      expect(firstLink.classes(hoverColorClass)).toBe(false);
+
+      // Because there is a watcher, we need to set the props after the component
+      // has mounted.
+      await wrapper.setProps({ highlightedJob: 'test_1' });
+
+      expect(firstLink.classes(defaultColorClass)).toBe(false);
+      expect(firstLink.classes(hoverColorClass)).toBe(true);
+    });
+  });
+});

spec/frontend/pipelines/pipeline_graph/mock_data.js

-import { createUniqueLinkId } from '~/pipelines/components/graph_shared/drawing_utils';
-
 export const yamlString = `stages:
 - empty
 - build
@@ -41,10 +39,28 @@ deploy_a:
   script: echo hello
 `;
 
-const jobId1 = createUniqueLinkId('build', 'build_1');
-const jobId2 = createUniqueLinkId('test', 'test_1');
-const jobId3 = createUniqueLinkId('test', 'test_2');
-const jobId4 = createUniqueLinkId('deploy', 'deploy_1');
+export const pipelineDataWithNoNeeds = {
+  stages: [
+    {
+      name: 'build',
+      groups: [
+        {
+          name: 'build_1',
+          jobs: [{ script: 'echo hello', stage: 'build' }],
+        },
+      ],
+    },
+    {
+      name: 'test',
+      groups: [
+        {
+          name: 'test_1',
+          jobs: [{ script: 'yarn test', stage: 'test' }],
+        },
+      ],
+    },
+  ],
+};
 
 export const pipelineData = {
   stages: [
@@ -54,7 +70,6 @@ export const pipelineData = {
         {
           name: 'build_1',
           jobs: [{ script: 'echo hello', stage: 'build' }],
-          id: jobId1,
         },
       ],
     },
@@ -64,12 +79,10 @@ export const pipelineData = {
         {
           name: 'test_1',
           jobs: [{ script: 'yarn test', stage: 'test' }],
-          id: jobId2,
         },
         {
           name: 'test_2',
           jobs: [{ script: 'yarn karma', stage: 'test' }],
-          id: jobId3,
         },
       ],
     },
@@ -79,7 +92,86 @@ export const pipelineData = {
         {
           name: 'deploy_1',
           jobs: [{ script: 'yarn magick', stage: 'deploy', needs: ['test_1'] }],
-          id: jobId4,
+        },
+      ],
+    },
+  ],
+};
+
+export const parallelNeedData = {
+  stages: [
+    {
+      name: 'build',
+      groups: [
+        {
+          name: 'build_1',
+          parallel: 3,
+          jobs: [
+            { script: 'echo hello', stage: 'build', name: 'build_1 1/3' },
+            { script: 'echo hello', stage: 'build', name: 'build_1 2/3' },
+            { script: 'echo hello', stage: 'build', name: 'build_1 3/3' },
+          ],
+        },
+      ],
+    },
+    {
+      name: 'test',
+      groups: [
+        {
+          name: 'test_1',
+          jobs: [{ script: 'yarn test', stage: 'test', needs: ['build_1'] }],
+        },
+      ],
+    },
+  ],
+};
+
+export const largePipelineData = {
+  stages: [
+    {
+      name: 'build',
+      groups: [
+        {
+          name: 'build_1',
+          jobs: [{ script: 'echo hello', stage: 'build' }],
+        },
+        {
+          name: 'build_2',
+          jobs: [{ script: 'echo hello', stage: 'build' }],
+        },
+        {
+          name: 'build_3',
+          jobs: [{ script: 'echo hello', stage: 'build' }],
+        },
+      ],
+    },
+    {
+      name: 'test',
+      groups: [
+        {
+          name: 'test_1',
+          jobs: [{ script: 'yarn test', stage: 'test', needs: ['build_2'] }],
+        },
+        {
+          name: 'test_2',
+          jobs: [{ script: 'yarn karma', stage: 'test', needs: ['build_2'] }],
+        },
+      ],
+    },
+    {
+      name: 'deploy',
+      groups: [
+        {
+          name: 'deploy_1',
+          jobs: [{ script: 'yarn magick', stage: 'deploy', needs: ['test_1'] }],
+        },
+        {
+          name: 'deploy_2',
+          jobs: [{ script: 'yarn magick', stage: 'deploy', needs: ['build_3'] }],
+        },
+        {
+          name: 'deploy_3',
+          jobs: [{ script: 'yarn magick', stage: 'deploy', needs: ['test_2'] }],
         },
       ],
     },
@@ -94,9 +186,30 @@ export const singleStageData = {
         {
           name: 'build_1',
           jobs: [{ script: 'echo hello', stage: 'build' }],
-          id: jobId1,
         },
       ],
     },
   ],
 };
+
+export const rootRect = {
+  bottom: 463,
+  height: 271,
+  left: 236,
+  right: 1252,
+  top: 192,
+  width: 1016,
+  x: 236,
+  y: 192,
+};
+
+export const jobRect = {
+  bottom: 312,
+  height: 24,
+  left: 308,
+  right: 428,
+  top: 288,
+  width: 120,
+  x: 308,
+  y: 288,
+};