fixing tests

Signed-off-by: Yanjun Xiang <[email protected]>

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