Print slow tests in CI (#13163)

Author: hauntsaninja

tox.ini

@@ -17,8 +17,8 @@ description = run the test driver with {basepython}
 setenv = cov: COVERAGE_FILE={toxworkdir}/.coverage.{envname}
 passenv = PYTEST_XDIST_WORKER_COUNT PROGRAMDATA PROGRAMFILES(X86)
 deps = -rtest-requirements.txt
-commands = python -m pytest {posargs}
-           cov: python -m pytest {posargs: --cov mypy --cov-config setup.cfg}
+commands = python -m pytest --durations 100 {posargs}
+           cov: python -m pytest --durations 100 {posargs: --cov mypy --cov-config setup.cfg}
 
 
 [testenv:coverage]