def METHOD_NAME(self, mocker: MockerFixture) -> None:
    """Test use_concurrent."""
    mocker.patch.object(OsInfo, "is_posix", True)
    mocker.patch.object(self.env, "ci", False)
    assert not RunwayContext(deploy_environment=self.env).use_concurrent
    mocker.patch.object(self.env, "ci", True)
    assert RunwayContext(deploy_environment=self.env).use_concurrent