s3 unit test

Author: kai-ion

tests/aws-cpp-sdk-s3-unit-tests/S3UnitTests.cpp

@@ -378,6 +378,41 @@ TEST_F(S3UnitTest, PutObjectShouldHaveCorrectUserAgent) {
   EXPECT_TRUE(archMetadata < businessMetrics);
 }
 
+TEST_F(S3UnitTest, PutObjectS3ExpressShouldHaveJMetric) {
+  auto request = PutObjectRequest()
+    .WithBucket("test-express-bucket--usw2-az1--x-s3")
+    .WithKey("test-key");
+
+  std::shared_ptr<IOStream> body = Aws::MakeShared<StringStream>(ALLOCATION_TAG, "test content");
+  request.SetBody(body);
+
+  // Mock multiple responses for S3Express authentication flow
+  for (int i = 0; i < 3; i++) {
+    auto mockRequest = Aws::MakeShared<Standard::StandardHttpRequest>(ALLOCATION_TAG, "test.com", HttpMethod::HTTP_GET);
+    mockRequest->SetResponseStreamFactory([]() -> IOStream* {
+      return Aws::New<StringStream>(ALLOCATION_TAG, "", std::ios_base::in | std::ios_base::binary);
+    });
+    auto mockResponse = Aws::MakeShared<Standard::StandardHttpResponse>(ALLOCATION_TAG, mockRequest);
+    mockResponse->SetResponseCode(HttpResponseCode::REQUEST_NOT_MADE);
+    _mockHttpClient->AddResponseToReturn(mockResponse);
+  }
+
+  // Check user agent features before and after call
+  EXPECT_EQ(0u, request.GetUserAgentFeatures().size());
+  
+  const auto response = _s3Client->PutObject(request);
+  // Request will fail due to mock setup, but user agent features should be added
+  EXPECT_FALSE(response.IsSuccess());
+  
+  // Verify S3_EXPRESS_BUCKET feature (value 6) was added
+  const auto& features = request.GetUserAgentFeatures();
+  EXPECT_GT(features.size(), 0u);
+  
+  bool hasS3ExpressFeature = std::find(features.begin(), features.end(), 
+    Aws::Client::UserAgentFeature::S3_EXPRESS_BUCKET) != features.end();
+  EXPECT_TRUE(hasS3ExpressFeature);
+}
+
 TEST_F(S3UnitTest, RequestShouldNotIncludeAChecksumIfNotRequired) {
   S3ClientConfiguration configuration{};
   configuration.checksumConfig.requestChecksumCalculation = RequestChecksumCalculation::WHEN_REQUIRED;