[CPP] Add unit test

[761417898]

Does the TsFile_CPP project require unit tests? Can we use third-party libraries such as Gtest or CppUnit ?

[github-actions]

Hi, this is your first issue in the Apache TsFile project. Thanks for your report. Welcome to join the community!

[chrisdutz]

So this is more a legal than a technical question .. from a quick check Gtest is BSD 3-Clause Licensed, which is ok .. CppUnit is GPL licensed, which is not ok.

We probably should remove the tooling for Unity integration as this seems to be a pure C test setup which we will most probably not be using.

[chrisdutz]

This looks as if integrating it into our build would be simple:
https://google.github.io/googletest/quickstart-cmake.html

[jt2594838]

Good job. But I am afraid that we are facing something more challenging: verifying that TsFiles generated by the CPP edition can be read by the Java edition and vice versa.

The motivation is that I just found the dictionary encoding implementation is different on both sides. Other similar issues would better be detected automatically.

Any idea about this?

[chrisdutz]

I guess an "integration-test" sub-module makes sense for this ... I would however think that this issue is about unit-testing the Cpp code itself, right?

[jt2594838]

Of course, we should open another issue for it.

[761417898]

This looks as if integrating it into our build would be simple: https://google.github.io/googletest/quickstart-cmake.html

The unit test framework chosen is GTest, as recommended by Chris.
The unit tests have been implemented for the common utils file encoding section. Here is the MR #134