Support implicit namespaces (PEP 420)

[icemac]

FEATURE REQUEST

What I did:

Converted megrok.strictrequire to a package using a PEP 420 implicit namespace.
See zopefoundation/megrok.strictrequire#8

What I expect to happen:

Tests run like before.

What actually happened:

No tests were run because directories without an __init__.py are not considered to contain Python code.
See

zope.testrunner/src/zope/testrunner/find.py

Lines 295 to 299 in 4f9048a

	if dirname != p and not contains_init_py(options, files):
	# This is not a plausible test directory. Avoid descending
	# further.
	del dirs[:]
	continue

What version of Python and Zope/Addons I am using:

• OS independent
• Python 3.7+

⚠️ This feature is required to solve zopefoundation/meta#194

[dataflake]

Not sure if it helps, but if you invoke the test runner and pass a specific package name, like megrok.strictrequire, the test search will not start in src, but in src/megrok/strictrequire and circumvent the issue. The tests are found and run.

zope-testrunner --test-path=src --package megrok.strictrequire

[icemac]

@dataflake That's an interesting workaround for running the tests of a single package. The question would be if this could also work when testing an application having multiple packages.

[dataflake]

The package argument can be passed multiple times.

[jensens]

I stumbled over this too some weeks ago and switched to pytest in my project, forgot to create an issue here... Sorry.