Improve code coverage

Tests/BreezeLambdaWebHookTests/BreezeLambdaWebHookTests.swift

@@ -52,10 +52,12 @@ final class BreezeLambdaWebHookTests: XCTestCase {
         let createRequest = try Fixtures.fixture(name: Fixtures.postWebHook, type: "json")
         let request = try decoder.decode(APIGatewayV2Request.self, from: createRequest)
         let apiResponse: APIGatewayV2Response = try await Lambda.test(BreezeLambdaWebHook<MyPostWebHook>.self, with: request)
-        let response: String = try apiResponse.decodeBody()
+        let response: MyPostResponse = try apiResponse.decodeBody()
         XCTAssertEqual(apiResponse.statusCode, .ok)
         XCTAssertEqual(apiResponse.headers, [ "Content-Type": "application/json" ])
-        XCTAssertEqual(response, "body value")
+        let body: MyPostRequest = try request.bodyObject()
+        XCTAssertEqual(response.body, body.value)
+        XCTAssertEqual(response.handler, "build/webhook.post")
     }
 
     func test_getWhenMissingQuery_thenError() async throws {

Tests/BreezeLambdaWebHookTests/Fixtures/post_webhook_api_gtw.json

@@ -1,5 +1,5 @@
 {
-    "body": "body value",
+    "body": "{ \"value\": \"body value\" }",
     "headers": {
         "accept": "*/*",
         "accept-encoding": "gzip, deflate, br",

Tests/BreezeLambdaWebHookTests/Lambda.swift

@@ -0,0 +1,55 @@
+//    Copyright 2023 (c) Andrea Scuderi - https://github.com/swift-serverless
+//
+//    Licensed under the Apache License, Version 2.0 (the "License");
+//    you may not use this file except in compliance with the License.
+//    You may obtain a copy of the License at
+//
+//        http://www.apache.org/licenses/LICENSE-2.0
+//
+//    Unless required by applicable law or agreed to in writing, software
+//    distributed under the License is distributed on an "AS IS" BASIS,
+//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//    See the License for the specific language governing permissions and
+//    limitations under the License.
+
+import AWSLambdaEvents
+import AWSLambdaRuntime
+@testable import AWSLambdaRuntimeCore
+import AWSLambdaTesting
+import Logging
+import NIO
+
+extension Lambda {
+    public static func test<Handler: LambdaHandler>(
+        _ handlerType: Handler.Type,
+        with event: Handler.Event,
+        using config: TestConfig = .init()
+    ) async throws -> Handler.Output {
+        let logger = Logger(label: "test")
+        let eventLoopGroup = MultiThreadedEventLoopGroup(numberOfThreads: 1)
+        defer {
+            try! eventLoopGroup.syncShutdownGracefully()
+        }
+        let eventLoop = eventLoopGroup.next()
+
+        let initContext = LambdaInitializationContext.__forTestsOnly(
+            logger: logger,
+            eventLoop: eventLoop
+        )
+
+        let context = LambdaContext.__forTestsOnly(
+            requestID: config.requestID,
+            traceID: config.traceID,
+            invokedFunctionARN: config.invokedFunctionARN,
+            timeout: config.timeout,
+            logger: logger,
+            eventLoop: eventLoop
+        )
+        let handler = try await Handler(context: initContext)
+        defer {
+            let eventLoop = initContext.eventLoop.next()
+            try? initContext.terminator.terminate(eventLoop: eventLoop).wait()
+        }
+        return try await handler.handle(event, context: context)
+    }
+}

Tests/BreezeLambdaWebHookTests/MyPostWebHook.swift

@@ -18,6 +18,15 @@ import AsyncHTTPClient
 import AWSLambdaEvents
 import AWSLambdaRuntimeCore
 
+struct MyPostResponse: Codable {
+    let handler: String?
+    let body: String
+}
+
+struct MyPostRequest: Codable {
+    let value: String
+}
+
 class MyPostWebHook: BreezeLambdaWebHookHandler {
 
     let handlerContext: HandlerContext
@@ -29,9 +38,10 @@ class MyPostWebHook: BreezeLambdaWebHookHandler {
     func handle(context: AWSLambdaRuntimeCore.LambdaContext, event: AWSLambdaEvents.APIGatewayV2Request) async -> AWSLambdaEvents.APIGatewayV2Response {
         do {
             try await Task.sleep(nanoseconds: 1_000_000)
-            guard let value: String = event.body else {
+            guard let body: MyPostRequest = try event.bodyObject() else {
                 throw BreezeLambdaWebHookError.invalidRequest
             }
+            let value = MyPostResponse(handler: handler, body: body.value)
             return APIGatewayV2Response(with: value, statusCode: .ok)
         } catch {
             return APIGatewayV2Response(with: error, statusCode: .badRequest)