feat: replace external dependencies with mocks in unit tests

- Remove DynamoDB Local dependency from unit tests
- Replace integration tests with proper unit tests using Mockito
- Add E2E test scenario for real AWS infrastructure validation
- Improve test performance and reliability by eliminating external dependencies
- Add mockito-core dependency to powertools-idempotency-dynamodb module

Author: Gdm0714

powertools-e2e-tests/src/test/java/software/amazon/lambda/powertools/IdempotencyE2ET.java

@@ -75,4 +75,18 @@ public void test_ttlNotExpired_sameResult_ttlExpired_differentResult() throws In
         Assertions.assertThat(result2.getResult()).isEqualTo(result1.getResult());
         Assertions.assertThat(result3.getResult()).isNotEqualTo(result2.getResult());
     }
+
+    @Test
+    public void test_idempotencyWithRealDynamoDBTable() {
+        // GIVEN
+        String uniqueEvent = "{\"message\":\"test-" + UUID.randomUUID().toString() + "\"}";
+
+        // WHEN
+        InvocationResult result1 = invokeFunction(functionName, uniqueEvent);
+        InvocationResult result2 = invokeFunction(functionName, uniqueEvent);
+
+        // THEN
+        Assertions.assertThat(result1.getResult()).isNotNull();
+        Assertions.assertThat(result2.getResult()).isEqualTo(result1.getResult());
+    }
 }

powertools-idempotency/powertools-idempotency-dynamodb/pom.xml

@@ -60,21 +60,10 @@
 
         <!-- Test dependencies -->
         <dependency>
-            <groupId>com.amazonaws</groupId>
-            <artifactId>DynamoDBLocal</artifactId>
-            <!-- >2.2.0 is not compatible with Java 11 anymore -->
-            <!-- https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DynamoDBLocalHistory.html -->
-            <version>2.2.0</version>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
             <scope>test</scope>
         </dependency>
-        <!--Needed when building locally on M1 Mac-->
-        <dependency>
-            <groupId>io.github.ganadist.sqlite4java</groupId>
-            <artifactId>libsqlite4java-osx-aarch64</artifactId>
-            <version>1.0.392</version>
-            <scope>test</scope>
-            <type>dylib</type>
-        </dependency>
     </dependencies>
     <build>
         <plugins>

powertools-idempotency/powertools-idempotency-dynamodb/src/test/java/software/amazon/lambda/powertools/idempotency/persistence/dynamodb/DynamoDBConfig.java

@@ -14,89 +14,20 @@
 
 package software.amazon.lambda.powertools.idempotency.persistence.dynamodb;
 
-import java.io.IOException;
-import java.net.ServerSocket;
-import java.net.URI;
+import org.junit.jupiter.api.BeforeEach;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
 
-import org.junit.jupiter.api.AfterAll;
-import org.junit.jupiter.api.BeforeAll;
-
-import com.amazonaws.services.dynamodbv2.local.main.ServerRunner;
-import com.amazonaws.services.dynamodbv2.local.server.DynamoDBProxyServer;
-
-import software.amazon.awssdk.auth.credentials.AwsBasicCredentials;
-import software.amazon.awssdk.auth.credentials.StaticCredentialsProvider;
-import software.amazon.awssdk.http.urlconnection.UrlConnectionHttpClient;
-import software.amazon.awssdk.regions.Region;
 import software.amazon.awssdk.services.dynamodb.DynamoDbClient;
-import software.amazon.awssdk.services.dynamodb.model.AttributeDefinition;
-import software.amazon.awssdk.services.dynamodb.model.BillingMode;
-import software.amazon.awssdk.services.dynamodb.model.CreateTableRequest;
-import software.amazon.awssdk.services.dynamodb.model.DescribeTableRequest;
-import software.amazon.awssdk.services.dynamodb.model.DescribeTableResponse;
-import software.amazon.awssdk.services.dynamodb.model.KeySchemaElement;
-import software.amazon.awssdk.services.dynamodb.model.KeyType;
-import software.amazon.awssdk.services.dynamodb.model.ScalarAttributeType;
 
 public class DynamoDBConfig {
     protected static final String TABLE_NAME = "idempotency_table";
-    protected static DynamoDBProxyServer dynamoProxy;
-    protected static DynamoDbClient client;
-
-    @BeforeAll
-    public static void setupDynamo() {
-        int port = getFreePort();
-        try {
-            dynamoProxy = ServerRunner.createServerFromCommandLineArgs(new String[] {
-                    "-inMemory",
-                    "-port",
-                    Integer.toString(port)
-            });
-            dynamoProxy.start();
-        } catch (Exception e) {
-            throw new RuntimeException();
-        }
-
-        client = DynamoDbClient.builder()
-                .httpClient(UrlConnectionHttpClient.builder().build())
-                .region(Region.EU_WEST_1)
-                .endpointOverride(URI.create("http://localhost:" + port))
-                .credentialsProvider(StaticCredentialsProvider.create(
-                        AwsBasicCredentials.create("FAKE", "FAKE")))
-                .build();
-
-        client.createTable(CreateTableRequest.builder()
-                .tableName(TABLE_NAME)
-                .keySchema(KeySchemaElement.builder().keyType(KeyType.HASH).attributeName("id").build())
-                .attributeDefinitions(
-                        AttributeDefinition.builder().attributeName("id").attributeType(ScalarAttributeType.S).build())
-                .billingMode(BillingMode.PAY_PER_REQUEST)
-                .build());
-
-        DescribeTableResponse response = client
-                .describeTable(DescribeTableRequest.builder().tableName(TABLE_NAME).build());
-        if (response == null) {
-            throw new RuntimeException("Table was not created within expected time");
-        }
-    }
-
-    @AfterAll
-    public static void teardownDynamo() {
-        try {
-            dynamoProxy.stop();
-        } catch (Exception e) {
-            throw new RuntimeException();
-        }
-    }
-
-    private static int getFreePort() {
-        try {
-            ServerSocket socket = new ServerSocket(0);
-            int port = socket.getLocalPort();
-            socket.close();
-            return port;
-        } catch (IOException ioe) {
-            throw new RuntimeException(ioe);
-        }
+    
+    @Mock
+    protected DynamoDbClient client;
+    
+    @BeforeEach
+    public void setupMocks() {
+        MockitoAnnotations.openMocks(this);
     }
-}
+}