Fix E2E tests to return proper json for parsing in test suite.

Author: phipag

powertools-e2e-tests/README.md

@@ -1,16 +1,20 @@
 ## End-to-end tests
-This module is internal and meant to be used for end-to-end (E2E) testing of Powertools for AWS Lambda (Java). 
 
-__Prerequisites__: 
-- An AWS account is needed as well as a local environment able to reach this account 
-([credentials](https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/credentials.html)).
+This module is internal and meant to be used for end-to-end (E2E) testing of Powertools for AWS Lambda (Java).
+
+**Prerequisites**:
+
+- An AWS account is needed as well as a local environment able to reach this account
+  ([credentials](https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/credentials.html)).
 - [Java 11+](https://docs.aws.amazon.com/corretto/latest/corretto-11-ug/downloads-list.html)
-- [Docker](https://docs.docker.com/engine/install/)
+- [Docker](https://docs.docker.com/engine/install/) (or [Finch](https://github.com/runfinch/finch) — if using Finch, set `export CDK_DOCKER=finch` before running tests)
 
 To execute the E2E tests, use the following command: `export JAVA_VERSION=11 && mvn clean verify -Pe2e`
 
 ### Under the hood
+
 This module leverages the following components:
+
 - AWS CDK to define the infrastructure and synthesize a CloudFormation template and the assets (lambda function packages)
 - The AWS S3 SDK to push the assets on S3
-- The AWS CloudFormation SDK to deploy the template
+- The AWS CloudFormation SDK to deploy the template

powertools-e2e-tests/handlers/lambda-metadata/src/main/java/software/amazon/lambda/powertools/e2e/Function.java

@@ -14,15 +14,17 @@
 
 package software.amazon.lambda.powertools.e2e;
 
+import java.util.Map;
+
 import com.amazonaws.services.lambda.runtime.Context;
 import com.amazonaws.services.lambda.runtime.RequestHandler;
 import software.amazon.lambda.powertools.metadata.LambdaMetadata;
 import software.amazon.lambda.powertools.metadata.LambdaMetadataClient;
 
-public class Function implements RequestHandler<Object, String> {
+public class Function implements RequestHandler<Object, Map<String, String>> {
 
-    public String handleRequest(Object input, Context context) {
+    public Map<String, String> handleRequest(Object input, Context context) {
         LambdaMetadata metadata = LambdaMetadataClient.get();
-        return "{\"availabilityZoneId\": \"" + metadata.getAvailabilityZoneId() + "\"}";
+        return Map.of("availabilityZoneId", metadata.getAvailabilityZoneId());
     }
 }