Add test for Migration Helper (#518)

__tests__/tests/utilities/migration-helper.js

@@ -0,0 +1,45 @@
+import { getRepoIdFromUrl, toOldIssueFormat, toOldUserFormat } from 'utils';
+
+describe('Migration Helper', () => {
+  it('should return a repo id in {username}/{reponame} format', () => {
+    const result = getRepoIdFromUrl('https://api.github.com/repos/octocat/Hello-World');
+
+    expect(result).toBe('octocat/Hello-World');
+  });
+
+  it('should convert a user object to old format', () => {
+    const user = {};
+    const result = toOldUserFormat(user);
+    const resultKeys = Object.keys(result);
+
+    expect(result.avatar_url).toBe(user.avatarUrl);
+    expect(Object.keys(user).reduce((accum, key) => accum && resultKeys.includes(key), true)).toBe(true);
+  });
+
+  it('should convert an issue object to old format', () => {
+    const issue = {
+      author: {},
+      comments: {
+        totalCount: 7,
+      },
+      closedAt: '',
+      createdAt: '',
+      number: 42,
+      state: 'StAte',
+    };
+    const repoId = 'git-point';
+    const result = toOldIssueFormat(issue, repoId);
+    const resultKeys = Object.keys(result);
+
+    expect(Object.keys(issue).reduce((accum, key) => accum && resultKeys.includes(key), true)).toBe(true);
+    expect(result.comments).toBe(issue.comments.totalCount);
+    expect(result.closed_at).toBe(issue.closedAt);
+    expect(result.created_at).toBe(issue.createdAt);
+    expect(result.state).toBe('state');
+    expect(result.pull_request).toBeNull();
+    expect(result.url).toBe('https://api.github.com/repos/git-point/issues/42');
+
+    expect(toOldIssueFormat(issue, repoId, false).pull_request).toBeNull();
+    expect(toOldIssueFormat(issue, repoId, true).pull_request).toMatchObject({});
+  });
+});