Write a C++ test

We strongly recommend each developer to write C++ unit tests when sending a PR.

We use googletest as the C++ test infrastructure.
C++ tests should be added to the tests/cpp/ directory.
Make sure your C++ test source file is covered by this CMake glob.

Build and run Taichi C++ tests

bash

# build taichi with tests enabled
TAICHI_CMAKE_ARGS="-DTI_BUILD_TESTS:BOOL=ON" python setup.py develop

# run the C++ test
python tests/run_tests.py --cpp

:::note

Consider polishing the C++ test infrastructure:

Separate each translation unit into its own test executable
Have a unified script to control the execution of which set of tests :::

Add a new test case

Please follow Googletest Primer and Advanced googletest Topics.