1 files changed, 7 insertions, 3 deletions
diff --git a/Lib/unittest/async_case.py b/Lib/unittest/async_case.py
index 63ff6a5..bd06eb3 100644
--- a/Lib/unittest/async_case.py
+++ b/Lib/unittest/async_case.py
@@ -90,9 +90,13 @@ class IsolatedAsyncioTestCase(TestCase):
         self._callAsync(self.asyncSetUp)
 
     def _callTestMethod(self, method):
-        if self._callMaybeAsync(method) is not None:
-            warnings.warn(f'It is deprecated to return a value that is not None from a '
-                          f'test case ({method})', DeprecationWarning, stacklevel=4)
+        result = self._callMaybeAsync(method)
+        if result is not None:
+            msg = (
+                f'It is deprecated to return a value that is not None '
+                f'from a test case ({method} returned {type(result).__name__!r})',
+            )
+            warnings.warn(msg, DeprecationWarning, stacklevel=4)
 
     def _callTearDown(self):
         self._callAsync(self.asyncTearDown)