Add a metadata mock

Right now, we don't test the metadata endpoint
really at all. To test it, this mock adds a sample
response that could be paired with the diff_file
mock.

spec/frontend/diffs/mock_data/diff_file.js

@@ -13,6 +13,7 @@ export default {
   blob_name: 'CHANGELOG',
   blob_icon: '<i aria-hidden="true" data-hidden="true" class="fa fa-file-text-o fa-fw"></i>',
   file_hash: '1c497fbb3a46b78edf04cc2a2fa33f67e3ffbe2a',
+  file_identifier_hash: '928f8286952bda02d674b692addcbe077084663a',
   file_path: 'CHANGELOG',
   new_file: false,
   deleted_file: false,

spec/frontend/diffs/mock_data/diff_metadata.js

+/* eslint-disable import/prefer-default-export */
+/* https://gitlab.com/gitlab-org/frontend/rfcs/-/issues/20 */
+
+export const diffMetadata = {
+  real_size: '1',
+  size: 1,
+  branch_name: 'update-changelog',
+  source_branch_exists: true,
+  target_branch_name: 'master',
+  commit: null,
+  context_commits: null,
+  merge_request_diff: {
+    version_index: null,
+    created_at: '2019-11-07T06:48:35.202Z',
+    commits_count: 1,
+    latest: true,
+    short_commit_sha: 'eb227b3e',
+    base_version_path: '/gitlab-org/gitlab-test/-/merge_requests/4/diffs?diff_id=4',
+    head_version_path: '/gitlab-org/gitlab-test/-/merge_requests/4/diffs?diff_head=true',
+    version_path: '/gitlab-org/gitlab-test/-/merge_requests/4/diffs?diff_id=4',
+    compare_path:
+      '/gitlab-org/gitlab-test/-/merge_requests/4/diffs?diff_id=4\u0026start_sha=eb227b3e214624708c474bdab7bde7afc17cefcc',
+  },
+  start_version: null,
+  latest_diff: true,
+  latest_version_path: '/gitlab-org/gitlab-test/-/merge_requests/4/diffs',
+  added_lines: 2,
+  removed_lines: 0,
+  render_overflow_warning: false,
+  email_patch_path: '/gitlab-org/gitlab-test/-/merge_requests/4.patch',
+  plain_diff_path: '/gitlab-org/gitlab-test/-/merge_requests/4.diff',
+  merge_request_diffs: [
+    {
+      version_index: null,
+      created_at: '2019-11-07T06:48:35.202Z',
+      commits_count: 1,
+      latest: true,
+      short_commit_sha: 'eb227b3e',
+      base_version_path: '/gitlab-org/gitlab-test/-/merge_requests/4/diffs?diff_id=4',
+      head_version_path: '/gitlab-org/gitlab-test/-/merge_requests/4/diffs?diff_head=true',
+      version_path: '/gitlab-org/gitlab-test/-/merge_requests/4/diffs?diff_id=4',
+      compare_path:
+        '/gitlab-org/gitlab-test/-/merge_requests/4/diffs?diff_id=4\u0026start_sha=eb227b3e214624708c474bdab7bde7afc17cefcc',
+    },
+  ],
+  diff_files: [
+    {
+      added_lines: 2,
+      removed_lines: 0,
+      new_path: 'CHANGELOG',
+      old_path: 'CHANGELOG',
+      new_file: false,
+      deleted_file: false,
+      file_identifier_hash: '928f8286952bda02d674b692addcbe077084663a',
+      file_hash: '1c497fbb3a46b78edf04cc2a2fa33f67e3ffbe2a',
+    },
+  ],
+};

spec/frontend/diffs/store/actions_spec.js

@@ -53,6 +53,7 @@ import * as utils from '~/diffs/store/utils';
 import * as commonUtils from '~/lib/utils/common_utils';
 import { mergeUrlParams } from '~/lib/utils/url_utility';
 import { useLocalStorageSpy } from 'helpers/local_storage_helper';
+import { diffMetadata } from '../mock_data/diff_metadata';
 import createFlash from '~/flash';
 
 jest.mock('~/flash', () => jest.fn());
@@ -259,13 +260,19 @@ describe('DiffsStoreActions', () => {
   });
 
   describe('fetchDiffFilesMeta', () => {
-    it('should fetch diff meta information', done => {
-      const endpointMetadata = '/fetch/diffs_meta?view=inline';
-      const mock = new MockAdapter(axios);
-      const data = { diff_files: [] };
-      const res = { data };
-      mock.onGet(endpointMetadata).reply(200, res);
+    const endpointMetadata = '/fetch/diffs_metadata.json?view=inline';
+    const noFilesData = { ...diffMetadata };
+    let mock;
+
+    beforeEach(() => {
+      mock = new MockAdapter(axios);
+
+      delete noFilesData.diff_files;
 
+      mock.onGet(endpointMetadata).reply(200, diffMetadata);
+    });
+
+    it('should fetch diff meta information', done => {
       testAction(
         fetchDiffFilesMeta,
         {},
@@ -273,8 +280,8 @@ describe('DiffsStoreActions', () => {
         [
           { type: types.SET_LOADING, payload: true },
           { type: types.SET_LOADING, payload: false },
-          { type: types.SET_MERGE_REQUEST_DIFFS, payload: [] },
-          { type: types.SET_DIFF_DATA, payload: { data } },
+          { type: types.SET_MERGE_REQUEST_DIFFS, payload: diffMetadata.merge_request_diffs },
+          { type: types.SET_DIFF_DATA, payload: noFilesData },
         ],
         [],
         () => {
@@ -390,13 +397,18 @@ describe('DiffsStoreActions', () => {
     });
 
     describe('fetchDiffFilesMeta', () => {
-      it('should fetch diff meta information', done => {
-        const endpointMetadata = '/fetch/diffs_meta';
-        const mock = new MockAdapter(axios);
-        const data = { diff_files: [] };
-        const res = { data };
-        mock.onGet(endpointMetadata).reply(200, res);
+      const endpointMetadata = '/fetch/diffs_metadata.json';
+      const noFilesData = { ...diffMetadata };
+      let mock;
 
+      beforeEach(() => {
+        mock = new MockAdapter(axios);
+
+        delete noFilesData.diff_files;
+
+        mock.onGet(endpointMetadata).reply(200, diffMetadata);
+      });
+      it('should fetch diff meta information', done => {
         testAction(
           fetchDiffFilesMeta,
           {},
@@ -404,8 +416,8 @@ describe('DiffsStoreActions', () => {
           [
             { type: types.SET_LOADING, payload: true },
             { type: types.SET_LOADING, payload: false },
-            { type: types.SET_MERGE_REQUEST_DIFFS, payload: [] },
-            { type: types.SET_DIFF_DATA, payload: { data } },
+            { type: types.SET_MERGE_REQUEST_DIFFS, payload: diffMetadata.merge_request_diffs },
+            { type: types.SET_DIFF_DATA, payload: noFilesData },
           ],
           [],
           () => {