Merge branch '292930-breakdown-pipeline_editor_app-into-smaller-components' into 'master'

Merge feature branch for Pipeline Editor app refactor

See merge request gitlab-org/gitlab!52200

app/assets/javascripts/pipeline_editor/components/commit/commit_section.vue

+<script>
+import CommitForm from './commit_form.vue';
+import commitCIFile from '../../graphql/mutations/commit_ci_file.mutation.graphql';
+import getCommitSha from '../../graphql/queries/client/commit_sha.graphql';
+
+import { COMMIT_FAILURE, COMMIT_SUCCESS } from '../../constants';
+import { mergeUrlParams, redirectTo } from '~/lib/utils/url_utility';
+import { __, s__, sprintf } from '~/locale';
+
+const MR_SOURCE_BRANCH = 'merge_request[source_branch]';
+const MR_TARGET_BRANCH = 'merge_request[target_branch]';
+
+export default {
+  alertTexts: {
+    [COMMIT_FAILURE]: s__('Pipelines|The GitLab CI configuration could not be updated.'),
+    [COMMIT_SUCCESS]: __('Your changes have been successfully committed.'),
+  },
+  i18n: {
+    defaultCommitMessage: __('Update %{sourcePath} file'),
+  },
+  components: {
+    CommitForm,
+  },
+  inject: ['projectFullPath', 'ciConfigPath', 'defaultBranch', 'newMergeRequestPath'],
+  props: {
+    ciFileContent: {
+      type: String,
+      required: true,
+    },
+  },
+  data() {
+    return {
+      commit: {},
+      isSaving: false,
+    };
+  },
+  apollo: {
+    commitSha: {
+      query: getCommitSha,
+    },
+  },
+  computed: {
+    defaultCommitMessage() {
+      return sprintf(this.$options.i18n.defaultCommitMessage, { sourcePath: this.ciConfigPath });
+    },
+  },
+  methods: {
+    redirectToNewMergeRequest(sourceBranch) {
+      const url = mergeUrlParams(
+        {
+          [MR_SOURCE_BRANCH]: sourceBranch,
+          [MR_TARGET_BRANCH]: this.defaultBranch,
+        },
+        this.newMergeRequestPath,
+      );
+      redirectTo(url);
+    },
+    async onCommitSubmit({ message, branch, openMergeRequest }) {
+      this.isSaving = true;
+
+      try {
+        const {
+          data: {
+            commitCreate: { errors },
+          },
+        } = await this.$apollo.mutate({
+          mutation: commitCIFile,
+          variables: {
+            projectPath: this.projectFullPath,
+            branch,
+            startBranch: this.defaultBranch,
+            message,
+            filePath: this.ciConfigPath,
+            content: this.ciFileContent,
+            lastCommitId: this.commitSha,
+          },
+          update(store, { data }) {
+            const commitSha = data?.commitCreate?.commit?.sha;
+
+            if (commitSha) {
+              store.writeQuery({ query: getCommitSha, data: { commitSha } });
+            }
+          },
+        });
+
+        if (errors?.length) {
+          this.$emit('showError', { type: COMMIT_FAILURE, reasons: errors });
+        } else if (openMergeRequest) {
+          this.redirectToNewMergeRequest(branch);
+        } else {
+          this.$emit('commit', { type: COMMIT_SUCCESS });
+        }
+      } catch (error) {
+        this.$emit('showError', { type: COMMIT_FAILURE, reasons: [error?.message] });
+      } finally {
+        this.isSaving = false;
+      }
+    },
+    onCommitCancel() {
+      this.$emit('resetContent');
+    },
+  },
+};
+</script>
+
+<template>
+  <commit-form
+    :default-branch="defaultBranch"
+    :default-message="defaultCommitMessage"
+    :is-saving="isSaving"
+    @cancel="onCommitCancel"
+    @submit="onCommitSubmit"
+  />
+</template>

app/assets/javascripts/pipeline_editor/components/header/pipeline_editor_header.vue

+<script>
+import ValidationSegment from './validation_segment.vue';
+
+export default {
+  validationSegmentClasses:
+    'gl-p-5 gl-bg-gray-10 gl-border-solid gl-border-1 gl-border-gray-100 gl-rounded-base',
+  components: {
+    ValidationSegment,
+  },
+  props: {
+    ciConfigData: {
+      type: Object,
+      required: true,
+    },
+    isCiConfigDataLoading: {
+      type: Boolean,
+      required: true,
+    },
+  },
+};
+</script>
+<template>
+  <div class="gl-mb-5">
+    <validation-segment
+      :class="$options.validationSegmentClasses"
+      :loading="isCiConfigDataLoading"
+      :ci-config="ciConfigData"
+    />
+  </div>
+</template>

app/assets/javascripts/pipeline_editor/components/pipeline_editor_tabs.vue

+<script>
+import { GlLoadingIcon, GlTabs, GlTab } from '@gitlab/ui';
+import { s__ } from '~/locale';
+import glFeatureFlagsMixin from '~/vue_shared/mixins/gl_feature_flags_mixin';
+import CiLint from './lint/ci_lint.vue';
+import EditorTab from './ui/editor_tab.vue';
+import TextEditor from './text_editor.vue';
+import PipelineGraph from '~/pipelines/components/pipeline_graph/pipeline_graph.vue';
+
+export default {
+  i18n: {
+    tabEdit: s__('Pipelines|Write pipeline configuration'),
+    tabGraph: s__('Pipelines|Visualize'),
+    tabLint: s__('Pipelines|Lint'),
+  },
+  components: {
+    CiLint,
+    EditorTab,
+    GlLoadingIcon,
+    GlTab,
+    GlTabs,
+    PipelineGraph,
+    TextEditor,
+  },
+  mixins: [glFeatureFlagsMixin()],
+  props: {
+    ciConfigData: {
+      type: Object,
+      required: true,
+    },
+    ciFileContent: {
+      type: String,
+      required: true,
+    },
+    isCiConfigDataLoading: {
+      type: Boolean,
+      required: false,
+      default: false,
+    },
+  },
+};
+</script>
+<template>
+  <gl-tabs class="file-editor gl-mb-3">
+    <editor-tab :title="$options.i18n.tabEdit" lazy data-testid="editor-tab">
+      <text-editor :value="ciFileContent" v-on="$listeners" />
+    </editor-tab>
+    <gl-tab
+      v-if="glFeatures.ciConfigVisualizationTab"
+      :title="$options.i18n.tabGraph"
+      lazy
+      data-testid="visualization-tab"
+    >
+      <gl-loading-icon v-if="isCiConfigDataLoading" size="lg" class="gl-m-3" />
+      <pipeline-graph v-else :pipeline-data="ciConfigData" />
+    </gl-tab>
+    <editor-tab :title="$options.i18n.tabLint" data-testid="lint-tab">
+      <gl-loading-icon v-if="isCiConfigDataLoading" size="lg" class="gl-m-3" />
+      <ci-lint v-else :ci-config="ciConfigData" />
+    </editor-tab>
+  </gl-tabs>
+</template>

app/assets/javascripts/pipeline_editor/components/text_editor.vue

@@ -2,26 +2,29 @@
 import EditorLite from '~/vue_shared/components/editor_lite.vue';
 import { CiSchemaExtension } from '~/editor/extensions/editor_ci_schema_ext';
 import { EDITOR_READY_EVENT } from '~/editor/constants';
+import getCommitSha from '../graphql/queries/client/commit_sha.graphql';
 
 export default {
   components: {
     EditorLite,
   },
-  inject: ['projectPath', 'projectNamespace'],
+  inject: ['ciConfigPath', 'projectPath', 'projectNamespace'],
   inheritAttrs: false,
-  props: {
-    ciConfigPath: {
-      type: String,
-      required: true,
+  data() {
+    return {
+      commitSha: '',
+    };
   },
+  apollo: {
     commitSha: {
-      type: String,
-      required: false,
-      default: null,
+      query: getCommitSha,
     },
   },
   methods: {
-    onEditorReady() {
+    onCiConfigUpdate(content) {
+      this.$emit('updateCiConfig', content);
+    },
+    registerCiSchema() {
       const editorInstance = this.$refs.editor.getEditor();
 
       editorInstance.use(new CiSchemaExtension());
@@ -41,7 +44,8 @@ export default {
       ref="editor"
       :file-name="ciConfigPath"
       v-bind="$attrs"
-      @[$options.readyEvent]="onEditorReady"
+      @[$options.readyEvent]="registerCiSchema"
+      @input="onCiConfigUpdate"
       v-on="$listeners"
     />
   </div>

app/assets/javascripts/pipeline_editor/constants.js

 export const CI_CONFIG_STATUS_VALID = 'VALID';
 export const CI_CONFIG_STATUS_INVALID = 'INVALID';
+
+export const COMMIT_FAILURE = 'COMMIT_FAILURE';
+export const COMMIT_SUCCESS = 'COMMIT_SUCCESS';
+
+export const DEFAULT_FAILURE = 'DEFAULT_FAILURE';
+export const LOAD_FAILURE_NO_FILE = 'LOAD_FAILURE_NO_FILE';
+export const LOAD_FAILURE_UNKNOWN = 'LOAD_FAILURE_UNKNOWN';

app/assets/javascripts/pipeline_editor/graphql/mutations/commit_ci_file.mutation.graphql

-mutation commitCIFileMutation(
+mutation commitCIFile(
   $projectPath: ID!
   $branch: String!
   $startBranch: String

app/assets/javascripts/pipeline_editor/graphql/queries/client/commit_sha.graphql

+query getCommitSha {
+  commitSha @client
+}

app/assets/javascripts/pipeline_editor/index.js

@@ -15,14 +15,13 @@ export const initPipelineEditor = (selector = '#js-pipeline-editor') => {
   }
 
   const {
-    // props
-    ciConfigPath,
+    // Add to apollo cache as it can be updated by future queries
     commitSha,
+    // Add to provide/inject API for static values
+    ciConfigPath,
     defaultBranch,
-    newMergeRequestPath,
-
-    // `provide/inject` data
     lintHelpPagePath,
+    newMergeRequestPath,
     projectFullPath,
     projectPath,
     projectNamespace,
@@ -35,25 +34,27 @@ export const initPipelineEditor = (selector = '#js-pipeline-editor') => {
     defaultClient: createDefaultClient(resolvers, { typeDefs }),
   });
 
+  apolloProvider.clients.defaultClient.cache.writeData({
+    data: {
+      commitSha,
+    },
+  });
+
   return new Vue({
     el,
     apolloProvider,
     provide: {
+      ciConfigPath,
+      defaultBranch,
       lintHelpPagePath,
+      newMergeRequestPath,
       projectFullPath,
       projectPath,
       projectNamespace,
       ymlHelpPagePath,
     },
     render(h) {
-      return h(PipelineEditorApp, {
-        props: {
-          ciConfigPath,
-          commitSha,
-          defaultBranch,
-          newMergeRequestPath,
-        },
-      });
+      return h(PipelineEditorApp);
     },
   });
 };

app/assets/javascripts/pipeline_editor/pipeline_editor_home.vue

+<script>
+import CommitSection from './components/commit/commit_section.vue';
+import PipelineEditorTabs from './components/pipeline_editor_tabs.vue';
+import PipelineEditorHeader from './components/header/pipeline_editor_header.vue';
+
+export default {
+  components: {
+    CommitSection,
+    PipelineEditorHeader,
+    PipelineEditorTabs,
+  },
+  props: {
+    ciConfigData: {
+      type: Object,
+      required: true,
+    },
+    ciFileContent: {
+      type: String,
+      required: true,
+    },
+    isCiConfigDataLoading: {
+      type: Boolean,
+      required: true,
+    },
+  },
+};
+</script>
+
+<template>
+  <div>
+    <pipeline-editor-header
+      :ci-config-data="ciConfigData"
+      :is-ci-config-data-loading="isCiConfigDataLoading"
+    />
+    <pipeline-editor-tabs
+      :ci-config-data="ciConfigData"
+      :ci-file-content="ciFileContent"
+      :is-ci-config-data-loading="isCiConfigDataLoading"
+      v-on="$listeners"
+    />
+    <commit-section :ci-file-content="ciFileContent" v-on="$listeners" />
+  </div>
+</template>

spec/frontend/pipeline_editor/components/commit/commit_form_spec.js

@@ -5,7 +5,7 @@ import CommitForm from '~/pipeline_editor/components/commit/commit_form.vue';
 
 import { mockCommitMessage, mockDefaultBranch } from '../../mock_data';
 
-describe('~/pipeline_editor/pipeline_editor_app.vue', () => {
+describe('Pipeline Editor | Commit Form', () => {
   let wrapper;
 
   const createComponent = ({ props = {} } = {}, mountFn = shallowMount) => {
@@ -21,8 +21,8 @@ describe('~/pipeline_editor/pipeline_editor_app.vue', () => {
     });
   };
 
-  const findCommitTextarea = () => wrapper.find(GlFormTextarea);
-  const findBranchInput = () => wrapper.find(GlFormInput);
+  const findCommitTextarea = () => wrapper.findComponent(GlFormTextarea);
+  const findBranchInput = () => wrapper.findComponent(GlFormInput);
   const findNewMrCheckbox = () => wrapper.find('[data-testid="new-mr-checkbox"]');
   const findSubmitBtn = () => wrapper.find('[type="submit"]');
   const findCancelBtn = () => wrapper.find('[type="reset"]');

spec/frontend/pipeline_editor/components/commit/commit_section_spec.js

+import { mount } from '@vue/test-utils';
+import { GlFormTextarea, GlFormInput, GlLoadingIcon } from '@gitlab/ui';
+import CommitSection from '~/pipeline_editor/components/commit/commit_section.vue';
+import CommitForm from '~/pipeline_editor/components/commit/commit_form.vue';
+import { objectToQuery, redirectTo } from '~/lib/utils/url_utility';
+import commitCreate from '~/pipeline_editor/graphql/mutations/commit_ci_file.mutation.graphql';
+
+import {
+  mockCiConfigPath,
+  mockCiYml,
+  mockCommitSha,
+  mockCommitNextSha,
+  mockCommitMessage,
+  mockDefaultBranch,
+  mockProjectFullPath,
+  mockNewMergeRequestPath,
+} from '../../mock_data';
+import { COMMIT_SUCCESS } from '~/pipeline_editor/constants';
+
+jest.mock('~/lib/utils/url_utility', () => ({
+  redirectTo: jest.fn(),
+  refreshCurrentPage: jest.fn(),
+  objectToQuery: jest.requireActual('~/lib/utils/url_utility').objectToQuery,
+  mergeUrlParams: jest.requireActual('~/lib/utils/url_utility').mergeUrlParams,
+}));
+
+const mockVariables = {
+  projectPath: mockProjectFullPath,
+  startBranch: mockDefaultBranch,
+  message: mockCommitMessage,
+  filePath: mockCiConfigPath,
+  content: mockCiYml,
+  lastCommitId: mockCommitSha,
+};
+
+const mockProvide = {
+  ciConfigPath: mockCiConfigPath,
+  defaultBranch: mockDefaultBranch,
+  projectFullPath: mockProjectFullPath,
+  newMergeRequestPath: mockNewMergeRequestPath,
+};
+
+describe('Pipeline Editor | Commit section', () => {
+  let wrapper;
+  let mockMutate;
+
+  const defaultProps = { ciFileContent: mockCiYml };
+
+  const createComponent = ({ props = {}, options = {}, provide = {} } = {}) => {
+    mockMutate = jest.fn().mockResolvedValue({
+      data: {
+        commitCreate: {
+          errors: [],
+          commit: {
+            sha: mockCommitNextSha,
+          },
+        },
+      },
+    });
+
+    wrapper = mount(CommitSection, {
+      propsData: { ...defaultProps, ...props },
+      provide: { ...mockProvide, ...provide },
+      data() {
+        return {
+          commitSha: mockCommitSha,
+        };
+      },
+      mocks: {
+        $apollo: {
+          mutate: mockMutate,
+        },
+      },
+      attachTo: document.body,
+      ...options,
+    });
+  };
+
+  const findCommitForm = () => wrapper.findComponent(CommitForm);
+  const findCommitBtnLoadingIcon = () =>
+    wrapper.find('[type="submit"]').findComponent(GlLoadingIcon);
+
+  const submitCommit = async ({
+    message = mockCommitMessage,
+    branch = mockDefaultBranch,
+    openMergeRequest = false,
+  } = {}) => {
+    await findCommitForm().findComponent(GlFormTextarea).setValue(message);
+    await findCommitForm().findComponent(GlFormInput).setValue(branch);
+    if (openMergeRequest) {
+      await findCommitForm().find('[data-testid="new-mr-checkbox"]').setChecked(openMergeRequest);
+    }
+    await findCommitForm().find('[type="submit"]').trigger('click');
+    // Simulate the write to local cache that occurs after a commit
+    await wrapper.setData({ commitSha: mockCommitNextSha });
+  };
+
+  const cancelCommitForm = async () => {
+    const findCancelBtn = () => wrapper.find('[type="reset"]');
+    await findCancelBtn().trigger('click');
+  };
+
+  beforeEach(() => {
+    createComponent();
+  });
+
+  afterEach(() => {
+    mockMutate.mockReset();
+
+    wrapper.destroy();
+    wrapper = null;
+  });
+
+  describe('when the user commits changes to the current branch', () => {
+    beforeEach(async () => {
+      await submitCommit();
+    });
+
+    it('calls the mutation with the default branch', () => {
+      expect(mockMutate).toHaveBeenCalledTimes(1);
+      expect(mockMutate).toHaveBeenCalledWith({
+        mutation: commitCreate,
+        update: expect.any(Function),
+        variables: {
+          ...mockVariables,
+          branch: mockDefaultBranch,
+        },
+      });
+    });
+
+    it('emits an event to communicate the commit was successful', () => {
+      expect(wrapper.emitted('commit')).toHaveLength(1);
+      expect(wrapper.emitted('commit')[0]).toEqual([{ type: COMMIT_SUCCESS }]);
+    });
+
+    it('shows no saving state', () => {
+      expect(findCommitBtnLoadingIcon().exists()).toBe(false);
+    });
+
+    it('a second commit submits the latest sha, keeping the form updated', async () => {
+      await submitCommit();
+
+      expect(mockMutate).toHaveBeenCalledTimes(2);
+      expect(mockMutate).toHaveBeenCalledWith({
+        mutation: commitCreate,
+        update: expect.any(Function),
+        variables: {
+          ...mockVariables,
+          lastCommitId: mockCommitNextSha,
+          branch: mockDefaultBranch,
+        },
+      });
+    });
+  });
+
+  describe('when the user commits changes to a new branch', () => {
+    const newBranch = 'new-branch';
+
+    beforeEach(async () => {
+      await submitCommit({
+        branch: newBranch,
+      });
+    });
+
+    it('calls the mutation with the new branch', () => {
+      expect(mockMutate).toHaveBeenCalledWith({
+        mutation: commitCreate,
+        update: expect.any(Function),
+        variables: {
+          ...mockVariables,
+          branch: newBranch,
+        },
+      });
+    });
+  });
+
+  describe('when the user commits changes to open a new merge request', () => {
+    const newBranch = 'new-branch';
+
+    beforeEach(async () => {
+      await submitCommit({
+        branch: newBranch,
+        openMergeRequest: true,
+      });
+    });
+
+    it('redirects to the merge request page with source and target branches', () => {
+      const branchesQuery = objectToQuery({
+        'merge_request[source_branch]': newBranch,
+        'merge_request[target_branch]': mockDefaultBranch,
+      });
+
+      expect(redirectTo).toHaveBeenCalledWith(`${mockNewMergeRequestPath}?${branchesQuery}`);
+    });
+  });
+
+  describe('when the commit is ocurring', () => {
+    it('shows a saving state', async () => {
+      mockMutate.mockImplementationOnce(() => {
+        expect(findCommitBtnLoadingIcon().exists()).toBe(true);
+        return Promise.resolve();
+      });
+
+      await submitCommit({
+        message: mockCommitMessage,
+        branch: mockDefaultBranch,
+        openMergeRequest: false,
+      });
+    });
+  });
+
+  describe('when the commit form is cancelled', () => {
+    beforeEach(async () => {
+      createComponent();
+    });
+
+    it('emits an event so that it cab be reseted', async () => {
+      await cancelCommitForm();
+
+      expect(wrapper.emitted('resetContent')).toHaveLength(1);
+    });
+  });
+});

spec/frontend/pipeline_editor/components/header/pipeline_editor_header_spec.js

+import { shallowMount } from '@vue/test-utils';
+import PipelineEditorHeader from '~/pipeline_editor/components/header/pipeline_editor_header.vue';
+import ValidationSegment from '~/pipeline_editor/components/header/validation_segment.vue';
+
+import { mockLintResponse } from '../../mock_data';
+
+describe('Pipeline editor header', () => {
+  let wrapper;
+
+  const createComponent = () => {
+    wrapper = shallowMount(PipelineEditorHeader, {
+      props: {
+        ciConfigData: mockLintResponse,
+        isCiConfigDataLoading: false,
+      },
+    });
+  };
+
+  const findValidationSegment = () => wrapper.findComponent(ValidationSegment);
+
+  afterEach(() => {
+    wrapper.destroy();
+    wrapper = null;
+  });
+
+  describe('template', () => {
+    beforeEach(() => {
+      createComponent();
+    });
+    it('renders the validation segment', () => {
+      expect(findValidationSegment().exists()).toBe(true);
+    });
+  });
+});

spec/frontend/pipeline_editor/components/info/validation_segment_spec.js → spec/frontend/pipeline_editor/components/header/validation_segment_spec.js

@@ -3,7 +3,9 @@ import { shallowMount } from '@vue/test-utils';
 import { GlIcon } from '@gitlab/ui';
 import { extendedWrapper } from 'helpers/vue_test_utils_helper';
 import { sprintf } from '~/locale';
-import ValidationSegment, { i18n } from '~/pipeline_editor/components/info/validation_segment.vue';
+import ValidationSegment, {
+  i18n,
+} from '~/pipeline_editor/components/header/validation_segment.vue';
 import { CI_CONFIG_STATUS_INVALID } from '~/pipeline_editor/constants';
 import { mockYmlHelpPagePath, mergeUnwrappedCiConfig } from '../../mock_data';
 
@@ -29,6 +31,11 @@ describe('~/pipeline_editor/components/info/validation_segment.vue', () => {
   const findLearnMoreLink = () => wrapper.findByTestId('learnMoreLink');
   const findValidationMsg = () => wrapper.findByTestId('validationMsg');
 
+  afterEach(() => {
+    wrapper.destroy();
+    wrapper = null;
+  });
+
   it('shows the loading state', () => {
     createComponent({ loading: true });
 

spec/frontend/pipeline_editor/components/pipeline_editor_tabs_spec.js

+import { nextTick } from 'vue';
+import { shallowMount, mount } from '@vue/test-utils';
+import { GlLoadingIcon } from '@gitlab/ui';
+import PipelineGraph from '~/pipelines/components/pipeline_graph/pipeline_graph.vue';
+import PipelineEditorTabs from '~/pipeline_editor/components/pipeline_editor_tabs.vue';
+import CiLint from '~/pipeline_editor/components/lint/ci_lint.vue';
+
+import { mockLintResponse, mockCiYml } from '../mock_data';
+
+describe('Pipeline editor tabs component', () => {
+  let wrapper;
+  const MockTextEditor = {
+    template: '<div />',
+  };
+  const mockProvide = {
+    glFeatures: {
+      ciConfigVisualizationTab: true,
+    },
+  };
+
+  const createComponent = ({ props = {}, provide = {}, mountFn = shallowMount } = {}) => {
+    wrapper = mountFn(PipelineEditorTabs, {
+      propsData: {
+        ciConfigData: mockLintResponse,
+        ciFileContent: mockCiYml,
+        isCiConfigDataLoading: false,
+        ...props,
+      },
+      provide: { ...mockProvide, ...provide },
+      stubs: {
+        TextEditor: MockTextEditor,
+      },
+    });
+  };
+
+  const findEditorTab = () => wrapper.find('[data-testid="editor-tab"]');
+  const findLintTab = () => wrapper.find('[data-testid="lint-tab"]');
+  const findVisualizationTab = () => wrapper.find('[data-testid="visualization-tab"]');
+  const findCiLint = () => wrapper.findComponent(CiLint);
+  const findLoadingIcon = () => wrapper.findComponent(GlLoadingIcon);
+  const findPipelineGraph = () => wrapper.findComponent(PipelineGraph);
+  const findTextEditor = () => wrapper.findComponent(MockTextEditor);
+
+  afterEach(() => {
+    wrapper.destroy();
+    wrapper = null;
+  });
+
+  describe('tabs', () => {
+    describe('editor tab', () => {
+      it('displays editor only after the tab is mounted', async () => {
+        createComponent({ mountFn: mount });
+
+        expect(findTextEditor().exists()).toBe(false);
+
+        await nextTick();
+
+        expect(findTextEditor().exists()).toBe(true);
+        expect(findEditorTab().exists()).toBe(true);
+      });
+    });
+
+    describe('visualization tab', () => {
+      describe('with feature flag on', () => {
+        describe('while loading', () => {
+          beforeEach(() => {
+            createComponent({ props: { isCiConfigDataLoading: true } });
+          });
+
+          it('displays a loading icon if the lint query is loading', () => {
+            expect(findLoadingIcon().exists()).toBe(true);
+            expect(findPipelineGraph().exists()).toBe(false);
+          });
+        });
+        describe('after loading', () => {
+          beforeEach(() => {
+            createComponent();
+          });
+
+          it('display the tab and visualization', () => {
+            expect(findVisualizationTab().exists()).toBe(true);
+            expect(findPipelineGraph().exists()).toBe(true);
+          });
+        });
+      });
+
+      describe('with feature flag off', () => {
+        beforeEach(() => {
+          createComponent({
+            provide: {
+              glFeatures: { ciConfigVisualizationTab: false },
+            },
+          });
+        });
+
+        it('does not display the tab or component', () => {
+          expect(findVisualizationTab().exists()).toBe(false);
+          expect(findPipelineGraph().exists()).toBe(false);
+        });
+      });
+    });
+
+    describe('lint tab', () => {
+      describe('while loading', () => {
+        beforeEach(() => {
+          createComponent({ props: { isCiConfigDataLoading: true } });
+        });
+
+        it('displays a loading icon if the lint query is loading', () => {
+          expect(findLoadingIcon().exists()).toBe(true);
+        });
+
+        it('does not display the lint component', () => {
+          expect(findCiLint().exists()).toBe(false);
+        });
+      });
+      describe('after loading', () => {
+        beforeEach(() => {
+          createComponent();
+        });
+
+        it('display the tab and the lint component', () => {
+          expect(findLintTab().exists()).toBe(true);
+          expect(findCiLint().exists()).toBe(true);
+        });
+      });
+    });
+  });
+});

spec/frontend/pipeline_editor/components/text_editor_spec.js

 import { shallowMount } from '@vue/test-utils';
 
-import { EDITOR_READY_EVENT } from '~/editor/constants';
-import TextEditor from '~/pipeline_editor/components/text_editor.vue';
 import {
   mockCiConfigPath,
   mockCiYml,
@@ -10,7 +8,10 @@ import {
   mockProjectNamespace,
 } from '../mock_data';
 
-describe('~/pipeline_editor/components/text_editor.vue', () => {
+import { EDITOR_READY_EVENT } from '~/editor/constants';
+import TextEditor from '~/pipeline_editor/components/text_editor.vue';
+
+describe('Pipeline Editor | Text editor component', () => {
   let wrapper;
 
   let editorReadyListener;
@@ -36,14 +37,17 @@ describe('~/pipeline_editor/components/text_editor.vue', () => {
       provide: {
         projectPath: mockProjectPath,
         projectNamespace: mockProjectNamespace,
-      },
-      propsData: {
         ciConfigPath: mockCiConfigPath,
-        commitSha: mockCommitSha,
       },
       attrs: {
         value: mockCiYml,
       },
+      // Simulate graphQL client query result
+      data() {
+        return {
+          commitSha: mockCommitSha,
+        };
+      },
       listeners: {
         [EDITOR_READY_EVENT]: editorReadyListener,
       },
@@ -54,8 +58,17 @@ describe('~/pipeline_editor/components/text_editor.vue', () => {
     });
   };
 
-  const findEditor = () => wrapper.find(MockEditorLite);
+  const findEditor = () => wrapper.findComponent(MockEditorLite);
+
+  afterEach(() => {
+    wrapper.destroy();
+    wrapper = null;
+
+    mockUse.mockClear();
+    mockRegisterCiSchema.mockClear();
+  });
 
+  describe('template', () => {
     beforeEach(() => {
       editorReadyListener = jest.fn();
       mockUse = jest.fn();
@@ -76,7 +89,26 @@ describe('~/pipeline_editor/components/text_editor.vue', () => {
       expect(findEditor().props('fileName')).toBe(mockCiConfigPath);
     });
 
-  it('editor is configured with syntax highligting', async () => {
+    it('bubbles up events', () => {
+      findEditor().vm.$emit(EDITOR_READY_EVENT);
+
+      expect(editorReadyListener).toHaveBeenCalled();
+    });
+  });
+
+  describe('register CI schema', () => {
+    beforeEach(async () => {
+      createComponent();
+
+      // Since the editor will have already mounted, the event will have fired.
+      // To ensure we properly test this, we clear the mock and re-remit the event.
+      mockRegisterCiSchema.mockClear();
+      mockUse.mockClear();
+
+      findEditor().vm.$emit(EDITOR_READY_EVENT);
+    });
+
+    it('configures editor with syntax highlight', async () => {
       expect(mockUse).toHaveBeenCalledTimes(1);
       expect(mockRegisterCiSchema).toHaveBeenCalledTimes(1);
       expect(mockRegisterCiSchema).toHaveBeenCalledWith({
@@ -85,10 +117,5 @@ describe('~/pipeline_editor/components/text_editor.vue', () => {
         ref: mockCommitSha,
       });
     });
-
-  it('bubbles up events', () => {
-    findEditor().vm.$emit(EDITOR_READY_EVENT);
-
-    expect(editorReadyListener).toHaveBeenCalled();
   });
 });

spec/frontend/pipeline_editor/pipeline_editor_home_spec.js

+import { shallowMount } from '@vue/test-utils';
+
+import PipelineEditorHome from '~/pipeline_editor/pipeline_editor_home.vue';
+import PipelineEditorTabs from '~/pipeline_editor/components/pipeline_editor_tabs.vue';
+import CommitSection from '~/pipeline_editor/components/commit/commit_section.vue';
+import PipelineEditorHeader from '~/pipeline_editor/components/header/pipeline_editor_header.vue';
+
+import { mockLintResponse, mockCiYml } from './mock_data';
+
+describe('Pipeline editor home wrapper', () => {
+  let wrapper;
+
+  const createComponent = ({ props = {} } = {}) => {
+    wrapper = shallowMount(PipelineEditorHome, {
+      propsData: {
+        ciConfigData: mockLintResponse,
+        ciFileContent: mockCiYml,
+        isCiConfigDataLoading: false,
+        ...props,
+      },
+    });
+  };
+
+  const findPipelineEditorHeader = () => wrapper.findComponent(PipelineEditorTabs);
+  const findPipelineEditorTabs = () => wrapper.findComponent(CommitSection);
+  const findCommitSection = () => wrapper.findComponent(PipelineEditorHeader);
+
+  afterEach(() => {
+    wrapper.destroy();
+    wrapper = null;
+  });
+
+  describe('renders', () => {
+    beforeEach(() => {
+      createComponent();
+    });
+
+    it('shows the pipeline editor header', () => {
+      expect(findPipelineEditorHeader().exists()).toBe(true);
+    });
+
+    it('shows the pipeline editor tabs', () => {
+      expect(findPipelineEditorTabs().exists()).toBe(true);
+    });
+
+    it('shows the commit section', () => {
+      expect(findCommitSection().exists()).toBe(true);
+    });
+  });
+});