diff --git a/tests/integration/test_httpx.py b/tests/integration/test_httpx.py
index cf1f6c2..4bedc8a 100644
--- a/tests/integration/test_httpx.py
+++ b/tests/integration/test_httpx.py
@@ -1,4 +1,3 @@
-import os
 
 import pytest
 
@@ -7,7 +6,6 @@ import vcr
 asyncio = pytest.importorskip("asyncio")
 httpx = pytest.importorskip("httpx")
 
-from vcr.stubs.httpx_stubs import HTTPX_REDIRECT_PARAM  # noqa: E402
 
 
 @pytest.fixture(params=["https", "http"])
diff --git a/tests/integration/test_proxy.py b/tests/integration/test_proxy.py
index c450ab2..7366d33 100644
--- a/tests/integration/test_proxy.py
+++ b/tests/integration/test_proxy.py
@@ -1,9 +1,8 @@
 """Test using a proxy."""
 
 import http.server
-import multiprocessing
-import threading
 import socketserver
+import threading
 from urllib.request import urlopen
 
 import pytest
diff --git a/vcr/serializers/compat.py b/vcr/serializers/compat.py
index 0ab358d..65ba96f 100644
--- a/vcr/serializers/compat.py
+++ b/vcr/serializers/compat.py
@@ -56,7 +56,7 @@ def convert_body_to_unicode(resp):
     If the request or responses body is bytes, decode it to a string
     (for python3 support)
     """
-    if type(resp) is not dict:
+    if not isinstance(resp, dict):
         # Some of the tests just serialize and deserialize a string.
         return _convert_string_to_unicode(resp)
     else: