Use pytest instead of deprecated nose

Makefile

@@ -23,7 +23,7 @@ docs: setup_docs build_docs
 	python -mwebbrowser file:///`pwd`/docs/_build/html/index.html
 
 test: setup
-	nosetests
+	pytest
 
 publish: setup_publish
 	python setup.py sdist

setup.py

@@ -65,7 +65,7 @@ def readme():
             'coverage',
             'moto[server]',
             'mock',
-            'nose',
+            'pytest',
         ],
     },
 )

tests/test_storage.py

@@ -8,9 +8,9 @@
 
 from datetime import datetime, timedelta
 from unittest import TestCase
+from pytest import raises
 
 from dateutil.tz import tzutc
-from nose.tools import assert_raises_regexp
 from thumbor.config import Config
 from thumbor.context import Context, RequestParameters
 from tornado.testing import gen_test
@@ -101,8 +101,7 @@ async def test_should_raise_on_invalid_config(self):
 
         await storage.put(IMAGE_URL % '9999', IMAGE_BYTES)
 
-        with assert_raises_regexp(RuntimeError,
-                                  "STORES_CRYPTO_KEY_FOR_EACH_IMAGE can't be True if no SECURITY_KEY specified"):
+        with raises(RuntimeError, match='STORES_CRYPTO_KEY_FOR_EACH_IMAGE can\'t be True if no SECURITY_KEY specified'):
             await storage.put_crypto(IMAGE_URL % '9999')
 
     @gen_test

version.txt

@@ -1 +1 @@
-3.2
+4.0b