Lintian tag information: package-contains-python-tests-in-global-namespace (type: warning)

Description (from lintian-explain-tags)

This package appears to contain Python test files such as test_foo.py or
test_foo/ in the global module namespace.

Whilst the tests may be useful in the binary package, it is probably a
mistake to pollute the "top-level" namespace in this way.

Please install them to a subdirectory of the module being tested instead
or simply omit from the binary package entirely.

Visibility: warning
Show-Always: no
Check: files/names

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