chore(cli): fix security related changes integ test (aws#8274)

The test was passing because (1) the stack contained an incorrect service principal
and (2) `--require-approval` was set to `never` by default. This means that the stack
was actually deployed but failed, making the test pass.

Corrected the service principal, added an expectation to ensure that the stack
did not deploy and removed the `--require-approval` CLI option during this test.


----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

packages/aws-cdk/test/integ/cli/app/app.js

@@ -107,7 +107,7 @@ class IamStack extends cdk.Stack {
     super(parent, id, props);
 
     new iam.Role(this, 'SomeRole', {
-      assumedBy: new iam.ServicePrincipal('ec2.amazon.aws.com')
+      assumedBy: new iam.ServicePrincipal('ec2.amazonaws.com')
     });
   }
 }

packages/aws-cdk/test/integ/cli/cdk-helpers.ts

@@ -39,6 +39,7 @@ export interface ShellOptions extends child_process.SpawnOptions {
 
 export interface CdkCliOptions extends ShellOptions {
   options?: string[];
+  neverRequireApproval?: boolean;
 }
 
 export function log(x: string) {
@@ -48,8 +49,10 @@ export function log(x: string) {
 export async function cdkDeploy(stackNames: string | string[], options: CdkCliOptions = {}) {
   stackNames = typeof stackNames === 'string' ? [stackNames] : stackNames;
 
+  const neverRequireApproval = options.neverRequireApproval ?? true;
+
   return await cdk(['deploy',
-    '--require-approval=never', // We never want a prompt in an unattended test
+    ...(neverRequireApproval ? ['--require-approval=never'] : []), // Default to no approval in an unattended test
     ...(options.options ?? []),
     ...fullStackName(stackNames)], options);
 }

packages/aws-cdk/test/integ/cli/cli.integtest.ts

@@ -160,9 +160,16 @@ test('security related changes without a CLI are expected to fail', async () =>
   // redirect /dev/null to stdin, which means there will not be tty attached
   // since this stack includes security-related changes, the deployment should
   // immediately fail because we can't confirm the changes
-  await expect(cdkDeploy('iam-test', {
+  const stackName = 'iam-test';
+  await expect(cdkDeploy(stackName, {
     options: ['<', '/dev/null'], // H4x, this only works because I happen to know we pass shell: true.
+    neverRequireApproval: false,
   })).rejects.toThrow('exited with error');
+
+  // Ensure stack was not deployed
+  await expect(cloudFormation('describeStacks', {
+    StackName: fullStackName(stackName),
+  })).rejects.toThrow('does not exist');
 });
 
 test('deploy wildcard with outputs', async () => {