diff --git a/rest_framework/tests/hyperlink_relations.py b/rest_framework/tests/relations_hyperlink.py
similarity index 100%
rename from rest_framework/tests/hyperlink_relations.py
rename to rest_framework/tests/relations_hyperlink.py
diff --git a/rest_framework/tests/nested_relations.py b/rest_framework/tests/relations_nested.py
similarity index 98%
rename from rest_framework/tests/nested_relations.py
rename to rest_framework/tests/relations_nested.py
index b9022cac2..0d18d4adc 100644
--- a/rest_framework/tests/nested_relations.py
+++ b/rest_framework/tests/relations_nested.py
@@ -1,4 +1,3 @@
-from copy import deepcopy
 from django.db import models
 from django.test import TestCase
 from rest_framework import serializers
diff --git a/rest_framework/tests/pk_relations.py b/rest_framework/tests/relations_pk.py
similarity index 100%
rename from rest_framework/tests/pk_relations.py
rename to rest_framework/tests/relations_pk.py