diff --git a/tests/test_utils.py b/tests/test_utils.py
new file mode 100644
index 00000000..92c04a1b
--- /dev/null
+++ b/tests/test_utils.py
@@ -0,0 +1,19 @@
+from .utils import simple_class
+
+
+class TestSimpleClass:
+    """
+    Tests for the testing helper function `make_class`.
+    """
+
+    def test_returns_class(self):
+        """
+        Returns a class object.
+        """
+        assert type is simple_class().__class__
+
+    def test_returns_distinct_classes(self):
+        """
+        Each call returns a completely new class.
+        """
+        assert simple_class() is not simple_class()
diff --git a/tests/utils.py b/tests/utils.py
index 3d10621d..261d15b6 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -65,21 +65,3 @@ def simple_attr(
         kw_only=kw_only,
         inherited=inherited,
     )
-
-
-class TestSimpleClass:
-    """
-    Tests for the testing helper function `make_class`.
-    """
-
-    def test_returns_class(self):
-        """
-        Returns a class object.
-        """
-        assert type is simple_class().__class__
-
-    def returns_distinct_classes(self):
-        """
-        Each call returns a completely new class.
-        """
-        assert simple_class() is not simple_class()