Add a config for pytest (#680)

pytest.ini

@@ -0,0 +1,87 @@
+[pytest]
+addopts =
+  # FIXME: Enable this once the test suite has no race conditions
+  # `pytest-xdist`:
+  # --numprocesses=auto
+
+  # Show 10 slowest invocations:
+  --durations=10
+
+  # A bit of verbosity doesn't hurt:
+  -v
+
+  # Report all the things == -rxXs:
+  -ra
+
+  # Show values of the local vars in errors/tracebacks:
+  --showlocals
+
+  # Autocollect and invoke the doctests from all modules:
+  # https://docs.pytest.org/en/stable/doctest.html
+  --doctest-modules
+
+  # Dump the test results in junit format:
+  --junitxml=.tox/tmp/test-results/pytest/results.xml
+
+  # Fail on config parsing warnings:
+  --strict-config
+
+  # Fail on non-existing markers:
+  # * Deprecated since v6.2.0 but may be reintroduced later covering a
+  #   broader scope:
+  # --strict
+  # * Exists since v4.5.0 (advised to be used instead of `--strict`):
+  --strict-markers
+
+  # `pytest-cov`:
+  # `pytest-cov`, "-p" preloads the module early:
+  -p pytest_cov
+  --no-cov-on-fail
+  --cov=proxy
+  --cov=tests/
+  --cov-branch
+  --cov-report=term-missing:skip-covered
+  --cov-report=html:.tox/tmp/test-results/pytest/cov/
+  --cov-report=xml
+  --cov-context=test
+  --cov-config=.coveragerc
+
+doctest_optionflags = ALLOW_UNICODE ELLIPSIS
+
+# Marks tests with an empty parameterset as xfail(run=False)
+empty_parameter_set_mark = xfail
+
+faulthandler_timeout = 30
+
+filterwarnings =
+  error
+
+junit_duration_report = call
+# xunit1 contains more metadata than xunit2 so it's better for CI UIs:
+junit_family = xunit1
+junit_logging = all
+junit_log_passing_tests = true
+junit_suite_name = proxy_py_test_suite
+
+# A mapping of markers to their descriptions allowed in strict mode:
+markers =
+
+minversion = 6.2.0
+
+# Optimize pytest's lookup by restricting potentially deep dir tree scan:
+norecursedirs =
+  build
+  dist
+  docs
+  examples
+  proxy.egg-info
+  .cache
+  .eggs
+  .git
+  .github
+  .tox
+  *.egg
+
+testpaths = tests/
+
+xfail_strict = true

requirements-testing.txt

@@ -4,6 +4,7 @@ coverage==6.1.1
 flake8==4.0.1
 pytest==6.2.5
 pytest-cov==3.0.0
+pytest-xdist == 2.4.0
 autopep8==1.6.0
 mypy==0.910
 py-spy==0.3.10

tox.ini

@@ -11,7 +11,7 @@ deps =
 # NOTE: `{envpython} -m pytest` because it'd add CWD into $PYTHONPATH
 # NOTE: testing the project from the Git checkout
 # NOTE: rather than one installed.
-commands = pytest --cov=proxy --cov=tests/ --cov-report=xml tests/ {posargs:}
+commands = pytest {posargs:}
 
 
 [dists]