Do not always force run of tests/ (#1380)

tox.ini

@@ -16,7 +16,7 @@ setenv =
 	# Use a non-existent file to prevent boto3 from loading
 	# any configuration from the user's environment
 	AWS_CONFIG_FILE = {toxinidir}/tests/no_such_file.conf
-commands = pytest --cov=storages tests/ {posargs}
+commands = pytest --cov=storages {posargs}
 deps =
 	cryptography
 	django3.2: django~=3.2.9
@@ -45,7 +45,6 @@ commands =
 	black --check .
 skip_install = true
 
-
 [pytest]
 # Default test paths to run, if no other paths are specified on the CLI
 # (specify paths after a -- e.g. `tox -- tests/test_s3.py`)