Fix test

jedi/plugins/stdlib.py

@@ -593,8 +593,9 @@ def _random_choice(sequences):
 def _dataclass(value, arguments, callback):
     """
     dataclass decorator can be called 2 times with different arguments. One to
-    customize it dataclass(eq=True) and another one with the class to
-    transform.
+    customize it dataclass(eq=True) and another one with the class to transform.
+
+    It supports dataclass, dataclass_transform and attrs.
     """
     for c in _follow_param(value.inference_state, arguments, 0):
         if c.is_class():

test/test_inference/test_signature.py

@@ -509,6 +509,10 @@ ids = [
 def test_extensions_dataclass_transform_signature(
     Script, skip_pre_python37, start, start_params, include_params
 ):
+    has_typing_ext = bool(Script('import typing_extensions').infer())
+    if not has_typing_ext:
+        raise pytest.skip("typing_extensions needed in target environment to run this test")
+
     code = dedent(
         """
             name: str
@@ -596,7 +600,8 @@ def test_dataclass_transform_signature(
              z = 5
          @define
          class X(Y):'''), ['y']],
-    ]
+    ],
+    ids=["define", "frozen", "define_customized", "define_subclass", "define_both"]
 )
 def test_attrs_signature(Script, skip_pre_python37, start, start_params):
     has_attrs = bool(Script('import attrs').infer())