Enhance tests

tests/cfn-custom-resource-mappings.test.ts

@@ -2,6 +2,7 @@ import { Stack } from 'aws-cdk-lib';
 import { mapToCustomResource } from '../src/custom-resource-mapping';
 import * as aws from '@pulumi/aws-native';
 import { MockSynth } from './mocks';
+import { typeName } from '../src/naming';
 
 jest.mock('@pulumi/aws-native', () => {
     return {
@@ -111,9 +112,28 @@ describe('Custom Resource Mapping', () => {
             }
         } as unknown as Stack;
 
-        // WHEN
+        // WHEN/THEN
         expect(() => {
             mapToCustomResource(logicalId, cfnType, cfnProps, {}, stack);
         }).toThrow('Synthesizer of stack my-stack does not support custom resources. It must inherit from PulumiSynthesizerBase.');
     });
+
+    test('Not a CustomResource', () => {
+        // GIVEN
+        const cfnType = 'AWS::S3::Bucket';
+        const logicalId = 'My-resource';
+
+
+        const stack = {
+            synthesizer: new MockSynth("bucket", "prefix/"),
+            node: {
+                id: 'my-stack',
+            }
+        } as unknown as Stack;
+
+        // WHEN
+        const returnValue = mapToCustomResource(logicalId, cfnType, {}, {}, stack);
+        // THEN
+        expect(returnValue).not.toBeDefined();
+    });
 });