[IMPROVEMENT] Update pytest config and related doc (#214)

* [IMPROVEMENT] Update pytest config and related doc

* Update CONTRIBUTING.rst

* Update Makefile

* Update tox.ini

Author: sumit-158

CONTRIBUTING.rst

@@ -79,7 +79,7 @@ Ready to contribute? Here's how to set up `scrapy-redis` for local development.
 5. When you're done making changes, check that your changes pass flake8 and the tests, including testing other Python versions with tox::
 
     $ flake8 scrapy_redis tests
-    $ python setup.py test or py.test
+    $ pytest --ignore=setup.py
     $ tox
 
    To get flake8 and tox, just pip install them into your virtualenv.
@@ -110,4 +110,4 @@ Tips
 
 To run a subset of tests::
 
-    $ py.test tests.test_scrapy_redis
+    $ pytest tests/test_scrapy_redis

Makefile

@@ -91,13 +91,13 @@ develop: clean
 	pip install -e .
 
 test: develop
-	py.test
+	pytest --ignore=setup.py
 
 test-all:
 	tox -v
 
 coverage: develop
-	coverage run -m py.test
+	coverage run -m pytest --ignore=setup.py
 	coverage combine
 	coverage report
 	coverage html

pytest.ini

@@ -7,7 +7,5 @@ python_files =
     test_*.py
     *_test.py
     tests.py
-ignore =
-    setup.py
 addopts =
     -rxEfsw -v

tox.ini

@@ -18,4 +18,4 @@ commands =
     scrapy1x: pip install scrapy>=1.0,<2.0
     scrapyrel: pip install scrapy
     scrapydev: pip install https://github.com/scrapy/scrapy/archive/master.zip
-    {posargs:coverage run -m py.test}
+    {posargs:coverage run -m pytest --ignore=setup.py }