add import test

packages/aws-cdk/test/diff.test.ts

@@ -8,13 +8,21 @@ import { Deployments } from '../lib/api/deployments';
 import { CdkToolkit } from '../lib/cdk-toolkit';
 import * as cfn from '../lib/api/util/cloudformation';
 import { NestedStackTemplates } from '../lib/api/nested-stack-helpers';
+import * as fs from 'fs';
 
 let cloudExecutable: MockCloudExecutable;
 let cloudFormation: jest.Mocked<Deployments>;
 let toolkit: CdkToolkit;
 
 describe('imports', () => {
   beforeEach(() => {
+    const outputToJson = {
+      '//': 'This file is generated by cdk migrate. It will be automatically deleted after the first successful deployment of this app to the environment of the original resources.',
+      'Source': 'localfile',
+      'Resources': [],
+    };
+    fs.writeFileSync('migrate.json', JSON.stringify(outputToJson, null, 2));
+
     jest.spyOn(cfn, 'createDiffChangeSet').mockImplementationOnce(async () => {
       return {
         Changes: [
@@ -82,6 +90,10 @@ describe('imports', () => {
     }));
   });
 
+  afterEach(() => {
+    fs.rmSync('migrate.json');
+  });
+
   test('imports', async () => {
     // GIVEN
     const buffer = new StringWritable();
@@ -96,6 +108,7 @@ describe('imports', () => {
     // THEN
     const plainTextOutput = buffer.data.replace(/\x1B\[[0-?]*[ -/]*[@-~]/g, '');
     expect(plainTextOutput).toContain(`Stack A
+Parameters and rules created during migration do not affect resource configuration.
 Resources
 [←] AWS::SQS::Queue Queue import
 [←] AWS::SQS::Queue Queue2 import