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python -m unittest discover -t . foo
where foo is a package
will not trigger load_tests in foo/__init__.py.
To reproduce:
mkdir -p demo/tests
cd demo
cat <<EOF > tests/__init__.py
import sys
import os
def load_tests(loader, tests, pattern):
 print("HI WE ARE LOADING!")
 this_dir = os.path.dirname(__file__)
 tests.addTest(loader.discover(start_dir=this_dir, pattern=pattern))
 return tests
EOF
python -m unittest discover -t . tests

This should fix this issue :)

Updated patch - fixes windows tests for this patch.

Updated patch.

Updated patch, after other recent conflicting changes.

(Pinging for reviews - I'm going to time out and land this early next week if I can't get a review on it, since this is actually a fairly significant oversight and I don't want unittest2 to run ahead of the stdlib - that way leads unmaintainable madness).

With one minor doc change (break up the really long sentence), this looks good to go to me.

New changeset ce0dd5e4b801 by Robert Collins in branch 'default':
Close #22457: Honour load_tests in the start_dir of discovery.
https://hg.python.org/cpython/rev/ce0dd5e4b801 

New changeset 2aac2d76035e by Robert Collins in branch 'default':
Fix regression in issue 22457 fix.
https://hg.python.org/cpython/rev/2aac2d76035e