Currently the tests are not included in the package tarball on PyPI. This is valid for both 3.x and 4.x versions.
I'm writing some external programs which rely on coverage functionality and would like to test them. The easiest way is to inherit my test suite from one of the coverage test classes and use all the helper methods which are there. This is not possible at the moment b/c the test suite is not shipped with the rest of the package.