diff --git a/vcr/unittest/testcase.py b/vcr/unittest/testcase.py
index 4e4d974..655edbd 100644
--- a/vcr/unittest/testcase.py
+++ b/vcr/unittest/testcase.py
@@ -2,14 +2,15 @@ import inspect
 import logging
 import os
 import unittest
-from .. import VCR
 
+from .. import VCR
 
 logger = logging.getLogger(__name__)
 
 
 class VCRMixin(object):
     """A TestCase mixin that provides VCR integration."""
+
     vcr_enabled = True
 
     def setUp(self):
@@ -22,8 +23,8 @@ class VCRMixin(object):
             self.addCleanup(cm.__exit__, None, None, None)
 
     def _get_vcr(self, **kwargs):
-        if 'cassette_library_dir' not in kwargs:
-            kwargs['cassette_library_dir'] = self._get_cassette_library_dir()
+        if "cassette_library_dir" not in kwargs:
+            kwargs["cassette_library_dir"] = self._get_cassette_library_dir()
         return VCR(**kwargs)
 
     def _get_vcr_kwargs(self, **kwargs):
@@ -31,11 +32,10 @@ class VCRMixin(object):
 
     def _get_cassette_library_dir(self):
         testdir = os.path.dirname(inspect.getfile(self.__class__))
-        return os.path.join(testdir, 'cassettes')
+        return os.path.join(testdir, "cassettes")
 
     def _get_cassette_name(self):
-        return '{0}.{1}.yaml'.format(self.__class__.__name__,
-                                     self._testMethodName)
+        return "{0}.{1}.yaml".format(self.__class__.__name__, self._testMethodName)
 
 
 class VCRTestCase(VCRMixin, unittest.TestCase):
diff --git a/vcr/unittest/tests/test_testcase.py b/vcr/unittest/tests/test_testcase.py
index a799015..36bf3ac 100644
--- a/vcr/unittest/tests/test_testcase.py
+++ b/vcr/unittest/tests/test_testcase.py
@@ -1,107 +1,111 @@
 import os
+from unittest import TextTestRunner, defaultTestLoader
 from unittest.mock import MagicMock
-from unittest import defaultTestLoader, TextTestRunner
 from urllib.request import urlopen
+
 from ..testcase import VCRTestCase
 
 
 def test_defaults():
-
     class MyTest(VCRTestCase):
         def test_foo(self):
             pass
 
     test = run_testcase(MyTest)[0][0]
-    expected_path = os.path.join(os.path.dirname(__file__), 'cassettes')
-    expected_name = 'MyTest.test_foo.yaml'
+    expected_path = os.path.join(os.path.dirname(__file__), "cassettes")
+    expected_name = "MyTest.test_foo.yaml"
     assert os.path.dirname(test.cassette._path) == expected_path
     assert os.path.basename(test.cassette._path) == expected_name
 
 
 def test_disabled():
-
     # Baseline vcr_enabled = True
     class MyTest(VCRTestCase):
         def test_foo(self):
             pass
+
     test = run_testcase(MyTest)[0][0]
-    assert hasattr(test, 'cassette')
+    assert hasattr(test, "cassette")
 
     # Test vcr_enabled = False
     class MyTest(VCRTestCase):
         vcr_enabled = False
+
         def test_foo(self):
             pass
+
     test = run_testcase(MyTest)[0][0]
-    assert not hasattr(test, 'cassette')
+    assert not hasattr(test, "cassette")
 
 
 def test_cassette_library_dir():
-
     class MyTest(VCRTestCase):
         def test_foo(self):
             pass
+
         def _get_cassette_library_dir(self):
-            return '/testing'
+            return "/testing"
 
     test = run_testcase(MyTest)[0][0]
-    assert test.cassette._path.startswith('/testing/')
+    assert test.cassette._path.startswith("/testing/")
 
 
 def test_cassette_name():
-
     class MyTest(VCRTestCase):
         def test_foo(self):
             pass
+
         def _get_cassette_name(self):
-            return 'my-custom-name'
+            return "my-custom-name"
 
     test = run_testcase(MyTest)[0][0]
-    assert os.path.basename(test.cassette._path) == 'my-custom-name'
+    assert os.path.basename(test.cassette._path) == "my-custom-name"
 
 
 def test_vcr_kwargs_overridden():
-
     class MyTest(VCRTestCase):
         def test_foo(self):
             pass
+
         def _get_vcr_kwargs(self):
             kwargs = super(MyTest, self)._get_vcr_kwargs()
-            kwargs['record_mode'] = 'new_episodes'
+            kwargs["record_mode"] = "new_episodes"
             return kwargs
 
     test = run_testcase(MyTest)[0][0]
-    assert test.cassette.record_mode == 'new_episodes'
+    assert test.cassette.record_mode == "new_episodes"
 
 
 def test_vcr_kwargs_passed():
-
     class MyTest(VCRTestCase):
         def test_foo(self):
             pass
+
         def _get_vcr_kwargs(self):
             return super(MyTest, self)._get_vcr_kwargs(
-                record_mode='new_episodes',
+                record_mode="new_episodes",
             )
 
     test = run_testcase(MyTest)[0][0]
-    assert test.cassette.record_mode == 'new_episodes'
+    assert test.cassette.record_mode == "new_episodes"
 
 
 def test_vcr_kwargs_cassette_dir():
-
     # Test that _get_cassette_library_dir applies if cassette_library_dir
     # is absent from vcr kwargs.
     class MyTest(VCRTestCase):
         def test_foo(self):
             pass
+
         def _get_vcr_kwargs(self):
             return dict(
-                record_mode='new_episodes',
+                record_mode="new_episodes",
             )
-        _get_cassette_library_dir = MagicMock(return_value='/testing')
+
+        _get_cassette_library_dir = MagicMock(return_value="/testing")
+
     test = run_testcase(MyTest)[0][0]
-    assert test.cassette._path.startswith('/testing/')
+    assert test.cassette._path.startswith("/testing/")
     assert test._get_cassette_library_dir.call_count == 1
 
     # Test that _get_cassette_library_dir is ignored if cassette_library_dir
@@ -109,30 +113,35 @@ def test_vcr_kwargs_cassette_dir():
     class MyTest(VCRTestCase):
         def test_foo(self):
             pass
+
         def _get_vcr_kwargs(self):
             return dict(
-                cassette_library_dir='/testing',
+                cassette_library_dir="/testing",
             )
-        _get_cassette_library_dir = MagicMock(return_value='/ignored')
+
+        _get_cassette_library_dir = MagicMock(return_value="/ignored")
+
     test = run_testcase(MyTest)[0][0]
-    assert test.cassette._path.startswith('/testing/')
+    assert test.cassette._path.startswith("/testing/")
     assert test._get_cassette_library_dir.call_count == 0
 
 
 def test_get_vcr_with_matcher(tmpdir):
-    cassette_dir = tmpdir.mkdir('cassettes')
+    cassette_dir = tmpdir.mkdir("cassettes")
     assert len(cassette_dir.listdir()) == 0
 
-    mock_matcher = MagicMock(return_value=True, __name__='MockMatcher')
+    mock_matcher = MagicMock(return_value=True, __name__="MockMatcher")
 
     class MyTest(VCRTestCase):
         def test_foo(self):
-            self.response = urlopen('http://example.com').read()
+            self.response = urlopen("http://example.com").read()
+
         def _get_vcr(self):
             myvcr = super(MyTest, self)._get_vcr()
-            myvcr.register_matcher('mymatcher', mock_matcher)
-            myvcr.match_on = ['mymatcher']
+            myvcr.register_matcher("mymatcher", mock_matcher)
+            myvcr.match_on = ["mymatcher"]
             return myvcr
+
         def _get_cassette_library_dir(self):
             return str(cassette_dir)
 
@@ -145,23 +154,27 @@ def test_get_vcr_with_matcher(tmpdir):
     test = run_testcase(MyTest)[0][0]
     assert len(test.cassette.requests) == 1
     assert mock_matcher.called
-    assert repr(mock_matcher.mock_calls[0]) == 'call(<Request (GET) http://example.com>, <Request (GET) http://example.com>)'
+    assert (
+        repr(mock_matcher.mock_calls[0])
+        == "call(<Request (GET) http://example.com>, <Request (GET) http://example.com>)"
+    )
 
 
 def test_testcase_playback(tmpdir):
-    cassette_dir = tmpdir.mkdir('cassettes')
+    cassette_dir = tmpdir.mkdir("cassettes")
     assert len(cassette_dir.listdir()) == 0
 
     # First test actually reads from the web.
 
     class MyTest(VCRTestCase):
         def test_foo(self):
-            self.response = urlopen('http://example.com').read()
+            self.response = urlopen("http://example.com").read()
+
         def _get_cassette_library_dir(self):
             return str(cassette_dir)
 
     test = run_testcase(MyTest)[0][0]
-    assert b'illustrative examples' in test.response
+    assert b"illustrative examples" in test.response
     assert len(test.cassette.requests) == 1
     assert test.cassette.play_count == 0
 
@@ -169,7 +182,7 @@ def test_testcase_playback(tmpdir):
 
     test2 = run_testcase(MyTest)[0][0]
     assert test.cassette is not test2.cassette
-    assert b'illustrative examples' in test.response
+    assert b"illustrative examples" in test.response
     assert len(test2.cassette.requests) == 1
     assert test2.cassette.play_count == 1