Allow specifying a custom GitLab URL for non-hosted instances

Author: nextrevision

src/__tests__/fixtures/gitlab-data.ts

@@ -4,6 +4,7 @@ import { CommitFileDiff, MergeRequest } from '../../types';
 export const TEST_COMPONENT_ID =
   'ari:cloud:compass:4958bb5d-3970-4a13-bebc-62bbca57f370:component/5ce8c075-7b72-4455-9be9-7f0a1c6e6db4/23b718b0-26a9-4654-9a48-4390a3e811dd';
 
+export const BASE_URL = 'https://gitlab.com';
 export const TEST_TOKEN = 'glpat-geTHYDSDGHJJ';
 
 export const TEST_GET_PROJECT_BY_ID_RESPONSE = {