Mark slow test to skip in default pytest

tests/conftest.py

@@ -34,6 +34,21 @@
 
 def pytest_addoption(parser):
     parser.addoption("--boto-model-file", action="store", default=None)
+    parser.addoption("--runslow", action="store_true", default=False, help="run slow tests")
+
+
+def pytest_configure(config):
+    config.addinivalue_line("markers", "slow: mark test as slow to run")
+
+
+def pytest_collection_modifyitems(config, items):
+    if config.getoption("--runslow"):
+        # --runslow given in cli: do not skip slow tests
+        return
+    skip_slow = pytest.mark.skip(reason="need --runslow option to run")
+    for item in items:
+        if "slow" in item.keywords:
+            item.add_marker(skip_slow)
 
 
 @pytest.fixture(scope="session")

tox.ini

@@ -49,7 +49,7 @@ passenv =
 # {posargs} can be passed in by additional arguments specified when invoking tox.
 # Can be used to specify which tests to run, e.g.: tox -- -s
 commands =
-    coverage run --source smexperiments -m pytest {posargs} -m "not slow"
+    coverage run --source smexperiments -m pytest {posargs}
     {env:IGNORE_COVERAGE:} coverage report  --fail-under=95
 extras = test
 deps =
@@ -95,7 +95,7 @@ passenv =
 # {posargs} can be passed in by additional arguments specified when invoking tox.
 # Can be used to specify which tests to run, e.g.: tox -- -s
 commands =
-    pytest {posargs} --verbose -m "slow" --capture=no
+    pytest {posargs} --verbose --runslow --capture=no
 extras = test
 deps =
     boto3 >= 1.10.32