diff --git a/tests/integration/test_boto.py b/tests/integration/test_boto.py
index 84132d7..6a396cc 100644
--- a/tests/integration/test_boto.py
+++ b/tests/integration/test_boto.py
@@ -1,12 +1,12 @@
 import pytest
 boto = pytest.importorskip("boto")
 
-import boto
-import boto.iam
-from boto.s3.connection import S3Connection
-from boto.s3.key import Key
-from ConfigParser import DuplicateSectionError
-import vcr
+import boto  # NOQA
+import boto.iam  # NOQA
+from boto.s3.connection import S3Connection  # NOQA
+from boto.s3.key import Key  # NOQA
+from ConfigParser import DuplicateSectionError  # NOQA
+import vcr  # NOQA
 
 
 def test_boto_stubs(tmpdir):
diff --git a/tests/integration/test_requests.py b/tests/integration/test_requests.py
index cc8360a..117e92e 100644
--- a/tests/integration/test_requests.py
+++ b/tests/integration/test_requests.py
@@ -1,7 +1,5 @@
 # -*- coding: utf-8 -*-
 '''Test requests' interaction with vcr'''
-from io import BytesIO
-
 import pytest
 import vcr
 from assertions import assert_cassette_empty, assert_is_json
@@ -97,7 +95,7 @@ def test_post(tmpdir, scheme):
 
 
 def test_post_chunked_binary(tmpdir, scheme):
-    '''Ensure that we can send chunked binary without breaking while trying to concatenate bytes with string.'''
+    '''Ensure that we can send chunked binary without breaking while trying to concatenate bytes with str.'''
     data1 = iter([b'data', b'to', b'send'])
     data2 = iter([b'data', b'to', b'send'])
     url = scheme + '://httpbin.org/post'
diff --git a/tests/integration/test_wild.py b/tests/integration/test_wild.py
index 47edc08..e8feeb5 100644
--- a/tests/integration/test_wild.py
+++ b/tests/integration/test_wild.py
@@ -3,7 +3,7 @@ from six.moves import xmlrpc_client
 
 requests = pytest.importorskip("requests")
 
-import vcr
+import vcr  # NOQA
 
 try:
     import httplib
diff --git a/tests/unit/test_cassettes.py b/tests/unit/test_cassettes.py
index fc7fac0..ef9e808 100644
--- a/tests/unit/test_cassettes.py
+++ b/tests/unit/test_cassettes.py
@@ -233,7 +233,8 @@ def test_cassette_use_called_without_path_uses_function_to_generate_path():
 
 
 def test_path_transformer_with_function_path():
-    path_transformer = lambda path: os.path.join('a', path)
+    def path_transformer(path):
+        return os.path.join('a', path)
 
     @Cassette.use(inject=True, path_transformer=path_transformer)
     def function_name(cassette):