def METHOD_NAME(self):
    settings = {
        "command": ["pyls"],
        "selector": "source.python",
        "env": {
            "PATH": "/a/b/"
        }
    }
    config = read_client_config("pyls", settings)
    transport_config = config.resolve_transport_config({})
    original_path = environ.copy()['PATH']
    resolved_path = transport_config.env['PATH']
    self.assertEqual(resolved_path, '/a/b/{}{}'.format(pathsep, original_path))