Remove hidden

last reference removed in 8447f39fe1

src/pip/_internal/cli/base_command.py

@@ -50,7 +50,6 @@ logger = logging.getLogger(__name__)
 class Command(object):
     name = None  # type: Optional[str]
     usage = None  # type: Optional[str]
-    hidden = False  # type: bool
     ignore_require_venv = False  # type: bool
 
     def __init__(self, isolated=False):

tests/functional/test_help.py

@@ -81,9 +81,6 @@ def test_help_commands_equally_functional(in_memory_pip):
     assert all(len(o) > 0 for o in out)
 
     for name, cls in commands.items():
-        if cls.hidden:
-            continue
-
         assert (
             in_memory_pip.pip('help', name).stdout ==
             in_memory_pip.pip(name, '--help').stdout != ""