python/ Run doctests when testing wheels.

python/pyproject.toml

@@ -62,7 +62,7 @@ build-verbosity = 2
 test-requires = "pytest"
 test-command = [
   "pytest {package}/tests",
-  "pytest --doctest-modules --doctest-continue-on-failure {package}/src/moocore",
+  "pytest --doctest-modules --doctest-continue-on-failure {package}",
 ]
 # skip tests on cp38-macosx_x86_64 because of https://github.com/catboost/catboost/issues/2371
 # skip tests on emulated architectures, as they are very slow
@@ -120,3 +120,4 @@ doctest_optionflags = "NUMBER"
 addopts = [
   "--import-mode=importlib",
 ]
+pythonpath = "src"