pytest: add src to PYTHONPATH

Author: 31ch

pyproject.toml

@@ -54,6 +54,9 @@ write_to = "src/python_training_project/version.py"
 [tool.pytest.ini_options]
 minversion = "6.0"
 addopts = "--cov --cov-report term --cov-report xml --junitxml=build/test-report.xml"
+pythonpath = [
+  "src",
+]
 testpaths = [
     "tests",
 ]