[issue24553] improve test coverage for subinterpreters

[Nick Coghlan]

Nick Coghlan added the comment:

There are some basic tests in test_capi as well:

* https://hg.python.org/cpython/file/09b223827f63/Lib/test/test_capi.py#l344
* https://hg.python.org/cpython/file/default/Programs/_testembed.c

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<http://bugs.python.org/issue24553>
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