Add a failing test for formatting Tuple[int, str, int]

tests/test_util_inspect.py

@@ -231,7 +231,7 @@ def test_Signature_partialmethod():
 @pytest.mark.skipif(sys.version_info < (3, 5),
                     reason='type annotation test is available on py35 or above')
 def test_Signature_annotations():
-    from typing_test_data import f0, f1, f2, f3, f4, f5, f6, f7, f8, f9, f10, f11
+    from typing_test_data import f0, f1, f2, f3, f4, f5, f6, f7, f8, f9, f10, f11, f12
 
     # Class annotations
     sig = inspect.Signature(f0).format_args()
@@ -284,6 +284,10 @@ def test_Signature_annotations():
     sig = inspect.Signature(f11, has_retval=False).format_args()
     assert sig == '(x: CustomAnnotation, y: 123)'
 
+    # tuple with more than two items
+    sig = inspect.Signature(f12).format_args()
+    assert sig == '() -> Tuple[int, str, int]'
+
 
 def test_safe_getattr_with_default():
     class Foo(object):

tests/typing_test_data.py

@@ -62,3 +62,7 @@ class CustomAnnotation:
 
 def f11(x: CustomAnnotation(), y: 123) -> None:
     pass
+
+
+def f12() -> Tuple[int, str, int]:
+    pass