Alter the runtests.py script to just call py.test (keep it simple)

travis: Run py.test --cov=oscar instead of coverage run

Makefile

 	cd docs && make html
 
 coverage:
-	coverage run ./runtests.py --with-xunit
-	coverage xml -i
+	py.test --cov=oscar --cov-report=term-missing
 
 lint:
 	./lint.sh

runtests.py

 #!/usr/bin/env python
-"""
-Custom test runner
-
-If args or options, we run the testsuite as quickly as possible.
-
-If args but no options, we default to using the spec plugin and aborting on
-first error/failure.
-
-If options, we ignore defaults and pass options onto pytest.
-
-Examples:
-
-Run all tests (as fast as possible)
-$ ./runtests.py
-
-Run all unit tests (using spec output)
-$ ./runtests.py tests/unit
-
-Run all checkout unit tests (using spec output)
-$ ./runtests.py tests/unit/checkout
-
-Re-run failing tests (requires pytest-cache)
-$ ./runtests.py ... --lf
-
-Drop into pdb when a test fails
-$ ./runtests.py ... --pdb
-"""
-
-import os
-import multiprocessing
 import sys
-import logging
-import warnings
 
 import pytest
-from django.utils.six.moves import map
-
-# No logging
-logging.disable(logging.CRITICAL)
-
 
 if __name__ == '__main__':
-    args = sys.argv[1:]
-
-    verbosity = 1
-    if not args:
-        # If run with no args, try and run the testsuite as fast as possible.
-        # That means across all cores and with no high-falutin' plugins.
-
-        try:
-            cpu_count = int(multiprocessing.cpu_count())
-        except ValueError:
-            cpu_count = 1
-
-        args = [
-            '--capture=no', '--nomigrations', '-n=%d' % cpu_count,
-            'tests'
-        ]
-    else:
-        # Some args/options specified.  Check to see if any options have
-        # been specified.  If they have, then don't set any
-        has_options = any(map(lambda x: x.startswith('--'), args))
-        if not has_options:
-            # Default options:
-            # --exitfirst Abort on first error/failure
-            # --capture=no Don't capture STDOUT
-            args.extend(['--capture=no', '--nomigrations', '--exitfirst'])
-        else:
-            args = [arg for arg in args if not arg.startswith('-')]
-
-    with warnings.catch_warnings():
-        # The warnings module in default configuration will never cause tests
-        # to fail, as it never raises an exception.  We alter that behaviour by
-        # turning DeprecationWarnings into exceptions, but exclude warnings
-        # triggered by third-party libs. Note: The context manager is not
-        # thread safe. Behaviour with multiple threads is undefined.
-        warnings.filterwarnings('error', category=DeprecationWarning)
-        warnings.filterwarnings('error', category=RuntimeWarning)
-        libs = r'(sorl\.thumbnail.*|bs4.*|webtest.*|inspect.*|re.*)'
-        warnings.filterwarnings(
-            'ignore', r'.*', DeprecationWarning, libs)
-
-        os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'tests.settings')
-        result_code = pytest.main(args)
-        sys.exit(result_code)
+    result_code = pytest.main()
+    sys.exit(result_code)

setup.py

     'pytest-cov==2.3.0',
     'pytest-django==2.9.1',
     'pytest-xdist==1.14',
+    'pytest-warnings==0.1.0',
     'pytest==2.9.2',
     'spec==0.11.1',
     'tox==1.8.1',

tests/conftest.py

 import os
+import warnings
+
 import django
 
 
 def pytest_addoption(parser):
     parser.addoption('--postgres', action='store_true')
+    parser.addoption(
+        '--deprecation', choices=['strict', 'log', 'none'], default='log')
 
 
 def pytest_configure(config):
     os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'tests.settings')
 
+    deprecation = config.getoption('deprecation')
+    if deprecation == 'strict':
+        warnings.simplefilter('error', DeprecationWarning)
+        warnings.simplefilter('error', PendingDeprecationWarning)
+        warnings.simplefilter('error', RuntimeWarning)
+    if deprecation == 'log':
+        warnings.simplefilter('always', DeprecationWarning)
+        warnings.simplefilter('always', PendingDeprecationWarning)
+        warnings.simplefilter('always', RuntimeWarning)
+    elif deprecation == 'none':
+        # Deprecation warnings are ignored by default
+        pass
+
     if config.getoption('postgres'):
         os.environ['DATABASE_ENGINE'] = 'django.db.backends.postgresql_psycopg2'
         os.environ['DATABASE_NAME'] = 'oscar'