TST: Add capture_stderr decorator to test_validate_docstrings (pandas-dev#22543)

Author: WillAyd

pandas/util/testing.py

@@ -673,7 +673,7 @@ def capture_stderr(f):
     AssertionError: assert 'foo\n' == 'bar\n'
     """
 
-    @wraps(f)
+    @compat.wraps(f)
     def wrapper(*args, **kwargs):
         try:
             sys.stderr = StringIO()

scripts/tests/test_validate_docstrings.py

@@ -6,6 +6,8 @@
 import validate_docstrings
 validate_one = validate_docstrings.validate_one
 
+from pandas.util.testing import capture_stderr
+
 
 class GoodDocStrings(object):
     """
@@ -518,21 +520,25 @@ def _import_path(self, klass=None, func=None):
 
         return base_path
 
+    @capture_stderr
     def test_good_class(self):
         assert validate_one(self._import_path(
             klass='GoodDocStrings')) == 0
 
+    @capture_stderr
     @pytest.mark.parametrize("func", [
         'plot', 'sample', 'random_letters', 'sample_values', 'head', 'head1',
         'contains', 'mode'])
     def test_good_functions(self, func):
         assert validate_one(self._import_path(
             klass='GoodDocStrings', func=func)) == 0
 
+    @capture_stderr
     def test_bad_class(self):
         assert validate_one(self._import_path(
             klass='BadGenericDocStrings')) > 0
 
+    @capture_stderr
     @pytest.mark.parametrize("func", [
         'func', 'astype', 'astype1', 'astype2', 'astype3', 'plot', 'method'])
     def test_bad_generic_functions(self, func):