diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 8443af300048ad9ae31ea808c28a063c9a24619d..580ca99052d4ee522aee26fc787db9ab3bdac0fd 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -12,6 +12,7 @@ pr:
 variables:
   YARN_CACHE_FOLDER: $(Pipeline.Workspace)/.yarn
   CI: true
+  Agent.Source.Git.ShallowFetchDepth: 1
 
 jobs:
   - job: 'Windows'
@@ -52,7 +53,7 @@ jobs:
           nodeVersion: '10.x'
           pythonVersion: '3.7'
     pool:
-      vmImage: macOS-10.14
+      vmImage: macOS-10.13
 
     steps:
       - template: .azure/steps.yml
diff --git a/test/datasource/orb.spec.ts b/test/datasource/orb.spec.ts
index 4db9ad0bf93cb1ba348a386e09fe77d8210c226f..6e3227cc9b555e4d43d1627637422c21d539e1ae 100644
--- a/test/datasource/orb.spec.ts
+++ b/test/datasource/orb.spec.ts
@@ -2,6 +2,9 @@ import _got from '../../lib/util/got';
 import * as datasource from '../../lib/datasource';
 
 jest.mock('../../lib/util/got');
+jest.mock('simple-git', () => {
+  throw new Error('Test');
+});
 
 const got: any = _got;