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Protobuf Conformance Tests

Google offers a conformance test suite that contains thousands of automated unit tests to check whether an implementation conforms to the specification. The suite is setup similarly to protoc plugins where a native executable calls the plugin and communicates via std::in and std::out. Due to limitations with pipes in Windows and macOS, the tester can currently only be run on Linux.

QuickBuffers currently passes all required and recommended tests and provides options to produce binary equivalent output to Protobuf-Java. The test implementation is in ConformanceQuickbuf.java.

Compile the QuickBuffers test executable

After encountering issues with Java wrapper scripts, we decided to compile the Java code to a native executable. This simultaneously tests GraalVM integration and makes sure that there no accidental runtime reflections.

# 1) build a native image of the generator
mvn clean package --projects "protoc-gen-quickbuf" -am -P"makeNative,useNative"

# 2) test the native generator and build the conformance executable
mvn clean package --projects quickbuf-runtime,conformance -am -P"makeNative,useNative"

# (note) native compilation without any prior packaging
mvn native:compile-no-fork -pl conformance -PmakeNative

The generated executable is in ${quickbufDir}/conformance/target/ConformanceQuickbuf.exe

Compile the native C++ runner+

The conformance_test_runner executable needs to be compiled on Linux using the commands below. Depending on the CPU this can take tens of minutes.

git clone https://github.com/protocolbuffers/protobuf.git
cd protobuf
git submodule update --init --recursive
cmake . -Dprotobuf_BUILD_CONFORMANCE=ON && cmake --build .

Execute the conformance_test_runner

cd ${protobufDir}
cp ${quickbufDir}/conformance/target/ConformanceQuickbuf.exe ${protobufDir}/
chmod +x ConformanceQuickbuf.exe
./conformance_test_runner --enforce_recommended ConformanceQuickbuf.exe

The output should list 0 failures. Unsupported features such as the text format and some Google internal formats are skipped.

user:~/protobuf$ ./conformance_test_runner --enforce_recommended ConformanceQuickbuf.exe
WARNING: All log messages before absl::InitializeLog() is called are written to STDERR
I0000 00:00:1675465291.622071   18024 conformance_test_runner.cc:315] ConformanceQuickbuf.exe

CONFORMANCE TEST BEGIN ====================================

CONFORMANCE SUITE PASSED: 653 successes, 1376 skipped, 0 expected failures, 0 unexpected failures.

WARNING: All log messages before absl::InitializeLog() is called are written to STDERR
I0000 00:00:1675465292.115120   22087 conformance_test_runner.cc:315] ConformanceQuickbuf.exe

CONFORMANCE TEST BEGIN ====================================

CONFORMANCE SUITE PASSED: 0 successes, 120 skipped, 0 expected failures, 0 unexpected failures.

ConformanceQuickbuf: received EOF from test runner after 120 tests. Bytes read: 12581, Bytes written: 1216
ConformanceQuickbuf: received EOF from test runner after 2030 tests. Bytes read: 166171, Bytes written: 55441