[test]added unit test cases for network-layer filter "direct_response"

test/extensions/filters/network/direct_response/BUILD

@@ -29,3 +29,15 @@ envoy_extension_cc_test(
         "//test/test_common:utility_lib",
     ],
 )
+
+envoy_extension_cc_test(
+    name = "direct_response_test",
+    srcs = ["direct_response_test.cc"],
+    extension_name = "envoy.filters.network.direct_response",
+    deps = [
+        "//source/extensions/filters/network/direct_response:filter",
+        "//test/mocks/api:api_mocks",
+        "//test/mocks/network:network_mocks",
+        "@envoy_api//envoy/extensions/filters/network/direct_response/v3:pkg_cc_proto",
+    ],
+)

test/extensions/filters/network/direct_response/direct_response_test.cc

@@ -0,0 +1,61 @@
+#include "envoy/extensions/filters/network/direct_response/v3/config.pb.validate.h"
+
+#include "extensions/filters/network/direct_response/filter.h"
+
+#include "test/mocks/api/mocks.h"
+#include "test/mocks/network/mocks.h"
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+
+using testing::_;
+using testing::NiceMock;
+
+namespace Envoy {
+namespace Extensions {
+namespace NetworkFilters {
+namespace DirectResponse {
+
+class DirectResponseFilterTest : public testing::Test {
+public:
+  void initialize(const std::string& response) {
+    filter_ = std::make_shared<DirectResponseFilter>(response);
+    filter_->initializeReadFilterCallbacks(read_filter_callbacks_);
+  }
+  std::shared_ptr<DirectResponseFilter> filter_;
+  NiceMock<Network::MockReadFilterCallbacks> read_filter_callbacks_;
+};
+
+// Test the filter's onNewConnection() with a non-empty response
+TEST_F(DirectResponseFilterTest, OnNewConnection) {
+  initialize("hello");
+  Buffer::OwnedImpl response("hello");
+  EXPECT_CALL(read_filter_callbacks_.connection_, write(BufferEqual(&response), false));
+  EXPECT_CALL(read_filter_callbacks_.connection_, close(Network::ConnectionCloseType::FlushWrite));
+  EXPECT_CALL(read_filter_callbacks_.connection_.stream_info_,
+              setResponseCodeDetails(StreamInfo::ResponseCodeDetails::get().DirectResponse));
+  EXPECT_EQ(Network::FilterStatus::StopIteration, filter_->onNewConnection());
+}
+
+// Test the filter's onNewConnection() with an empty response
+TEST_F(DirectResponseFilterTest, OnNewConnectionEmptyResponse) {
+  initialize("");
+  EXPECT_CALL(read_filter_callbacks_.connection_, write(_, _)).Times(0);
+  EXPECT_CALL(read_filter_callbacks_.connection_, close(Network::ConnectionCloseType::FlushWrite));
+  EXPECT_CALL(read_filter_callbacks_.connection_.stream_info_,
+              setResponseCodeDetails(StreamInfo::ResponseCodeDetails::get().DirectResponse));
+  EXPECT_EQ(Network::FilterStatus::StopIteration, filter_->onNewConnection());
+}
+
+// Test the filter's onData()
+TEST_F(DirectResponseFilterTest, OnData) {
+  initialize("hello");
+  Buffer::OwnedImpl data("data");
+  EXPECT_CALL(read_filter_callbacks_.connection_, write(_, _)).Times(0);
+  EXPECT_EQ(Network::FilterStatus::Continue, filter_->onData(data, false));
+}
+
+} // namespace DirectResponse
+} // namespace NetworkFilters
+} // namespace Extensions
+} // namespace Envoy

test/per_file_coverage.sh

@@ -13,7 +13,6 @@ declare -a KNOWN_LOW_COVERAGE=(
 "source/extensions/filters/network/sni_dynamic_forward_proxy:90.9"
 "source/extensions/filters/network/dubbo_proxy:96.1"
 "source/extensions/filters/network/dubbo_proxy/router:95.1"
-"source/extensions/filters/network/direct_response:89.3"
 "source/extensions/filters/network/mongo_proxy:94.0"
 "source/extensions/filters/network/common:96.1"
 "source/extensions/filters/network/common/redis:96.2"