SWIG编译的C ++ / Python代码的测试覆盖率

Question

I have a classical SWIG setup where a bunch of C++ function are called from Python. Now, after adding some tests (in Python), I'd like to get test coverage on the C++ sources. The classical Python method is

nosetests --with-coverage --cover-package=mypackage

but that only works for native Python modules. In fact, this will return the coverage on the mypackage.py file generated by SWIG.

Since I need coverage on the C++ files (/the shared library generated by SWIG), adding --coverage to compile and linker flags is certainly called for. Not sure where to go from there though.

Any hints?

Answer 1

Faced with a similar issue, but with C code. It's not related to the SWIG part, just need to compile your C++ code with the coverage instrumentation and execute it. I used gcov and gcovr for that.

With gcov , to make this work, compile the code with the following flags (enables gcov instrumentation)

CFLAGS_VAL += -O0 --coverage

Then, execute the test. Following the test run, .gcno and .gcda files should be generated.

To create the coverage report, run from your root folder

gcovr -r . --filter="" --html --html-details -o coverage/coverage.html

GCOV docs, here

Same can create with lcov, follow an example in this wiki page