def test_checkout_no_rev(self):
        new_branch = 'iamanothernewbranch'
        self.assertEqual(
            self.run_function(
                'git.checkout', [self.repo], rev=None, opts='-b ' + new_branch
            ),
            'Switched to a new branch \'' + new_branch + '\''
        )
        self.assertTrue(
            '\'rev\' argument is required unless -b or -B in opts' in
            self.run_function('git.checkout', [self.repo])
        )
Test git.checkout without a rev, both with -b in opts and without
dataset/ETHPy150Open saltstack/salt/tests/integration/modules/git.py/GitModuleTest.test_checkout_no_rev