fix(assert): support multiline strings with stringLike() (#17692)

Updates the `RegExp` constructor to support multiline. Resolves #17691

----

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

packages/@aws-cdk/assert-internal/README.md

@@ -103,7 +103,7 @@ The following matchers exist:
  back to exact value matching.
 - `arrayWith(E, [F, ...])` - value must be an array containing the given elements (or matchers) in any order.
 - `stringLike(S)` - value must be a string matching `S`. `S` may contain `*` as wildcard to match any number
- of characters.
+ of characters. Multiline strings are supported.
 - `anything()` - matches any value.
 - `notMatching(M)` - any value that does NOT match the given matcher (or exact value) given.
 - `encodedJson(M)` - value must be a string which, when decoded as JSON, matches the given matcher or

packages/@aws-cdk/assert-internal/lib/assertions/have-resource-matchers.ts

@@ -239,11 +239,11 @@ function isCallable(x: any): x is ((...args: any[]) => any) {
 }
 
 /**
- * Do a glob-like pattern match (which only supports *s)
+ * Do a glob-like pattern match (which only supports *s). Supports multiline strings.
  */
 export function stringLike(pattern: string): PropertyMatcher {
  // Replace * with .* in the string, escape the rest and brace with ^...$
- const regex = new RegExp(`^${pattern.split('*').map(escapeRegex).join('.*')}$`);
+ const regex = new RegExp(`^${pattern.split('*').map(escapeRegex).join('.*')}$`, 'm');
 
  return annotateMatcher({ $stringContaining: pattern }, (value: any, failure: InspectionFailure) => {
  if (typeof value !== 'string') {

packages/@aws-cdk/assert-internal/test/have-resource.test.ts

@@ -1,4 +1,14 @@
-import { ABSENT, arrayWith, exactValue, expect as cdkExpect, haveResource, haveResourceLike, Capture, anything } from '../lib/index';
+import {
+ ABSENT,
+ arrayWith,
+ exactValue,
+ expect as cdkExpect,
+ haveResource,
+ haveResourceLike,
+ Capture,
+ anything,
+ stringLike,
+} from '../lib/index';
 import { mkResource, mkStack } from './cloud-artifact';
 
 test('support resource with no properties', () => {
@@ -156,6 +166,30 @@ describe('property absence', () => {
  }).toThrowError(/Array did not contain expected element/);
  });
 
+ test('can use matcher to test stringLike on single-line strings', () => {
+ const synthStack = mkResource({
+ Content: 'something required something',
+ });
+
+ expect(() => {
+ cdkExpect(synthStack).to(haveResource('Some::Resource', {
+ Content: stringLike('*required*'),
+ }));
+ }).not.toThrowError();
+ });
+
+ test('can use matcher to test stringLike on multi-line strings', () => {
+ const synthStack = mkResource({
+ Content: 'something\nrequired\nsomething',
+ });
+
+ expect(() => {
+ cdkExpect(synthStack).to(haveResource('Some::Resource', {
+ Content: stringLike('*required*'),
+ }));
+ }).not.toThrowError();
+ });
+
  test('arrayContaining must match all elements in any order', () => {
  const synthStack = mkResource({
  List: ['a', 'b'],