fixing tests

Signed-off-by: Yanjun Xiang <yanjunxiang@google.com>

test/extensions/filters/http/ext_proc/ext_proc_integration_test.cc

@@ -1038,9 +1038,9 @@ TEST_P(ExtProcIntegrationTest, GetAndSetBodyAndHeadersAndTrailersOnResponse) {
  EXPECT_THAT(*(response->trailers()), SingleHeaderValueIs("x-modified-trailers", "xxx"));
 }
 
-// Test the filter using a configuration that processes response trailers, and process an upstream
-// response that has no trailers.
-TEST_P(ExtProcIntegrationTest, AddTrailersOnResponse) {
+// Test the filter using a configuration that sends response headers and trailers,
+// and process an upstream response that has no trailers.
+TEST_P(ExtProcIntegrationTest, NoTrailersOnResponseWithModeSendHeaderTrailer) {
  proto_config_.mutable_processing_mode()->set_response_trailer_mode(ProcessingMode::SEND);
  initializeConfig();
  HttpIntegrationTest::initialize();
@@ -1052,6 +1052,22 @@ TEST_P(ExtProcIntegrationTest, AddTrailersOnResponse) {
  verifyDownstreamResponse(*response, 200);
 }
 
+// Test the filter using a configuration that sends response body and trailers, and process
+// an upstream response that has no trailers.
+TEST_P(ExtProcIntegrationTest, NoTrailersOnResponseWithModeSendBodyTrailer) {
+ proto_config_.mutable_processing_mode()->set_request_header_mode(ProcessingMode::SKIP);
+ proto_config_.mutable_processing_mode()->set_response_header_mode(ProcessingMode::SKIP);
+ proto_config_.mutable_processing_mode()->set_response_body_mode(ProcessingMode::BUFFERED);
+ proto_config_.mutable_processing_mode()->set_response_trailer_mode(ProcessingMode::SEND);
+ initializeConfig();
+ HttpIntegrationTest::initialize();
+ auto response = sendDownstreamRequest(absl::nullopt);
+ handleUpstreamRequest();
+ processResponseBodyMessage(*grpc_upstreams_[0], true, absl::nullopt);
+
+ verifyDownstreamResponse(*response, 200);
+}
+
 // Test the filter with a response body callback enabled using an
 // an ext_proc server that responds to the response_body message
 // by requesting to modify the response body and headers, using a response