How to use the fakeredis.FakeStrictRedis.from_url function in fakeredis

def test_can_pass_through_extra_args(self):
        db = fakeredis.FakeStrictRedis.from_url(
            'redis://username:password@localhost:6379/0',
            decode_responses=True)
        db.set('foo', 'bar')
        self.assertEqual(db.get('foo'), 'bar')

def test_from_url(self):
        db = fakeredis.FakeStrictRedis.from_url(
            'redis://username:password@localhost:6379/0')
        db.set('foo', 'bar')
        self.assertEqual(db.get('foo'), b'bar')

def test_from_url_with_db_arg(self):
        db = fakeredis.FakeStrictRedis.from_url(
            'redis://username:password@localhost:6379/0')
        db1 = fakeredis.FakeStrictRedis.from_url(
            'redis://username:password@localhost:6379/1')
        db2 = fakeredis.FakeStrictRedis.from_url(
            'redis://username:password@localhost:6379/',
            db=2)
        db.set('foo', 'foo0')
        db1.set('foo', 'foo1')
        db2.set('foo', 'foo2')
        self.assertEqual(db.get('foo'), b'foo0')
        self.assertEqual(db1.get('foo'), b'foo1')
        self.assertEqual(db2.get('foo'), b'foo2')

def test_from_url_with_db_arg(self):
        db = fakeredis.FakeStrictRedis.from_url(
            'redis://username:password@localhost:6379/0')
        db1 = fakeredis.FakeStrictRedis.from_url(
            'redis://username:password@localhost:6379/1')
        db2 = fakeredis.FakeStrictRedis.from_url(
            'redis://username:password@localhost:6379/',
            db=2)
        db.set('foo', 'foo0')
        db1.set('foo', 'foo1')
        db2.set('foo', 'foo2')
        self.assertEqual(db.get('foo'), b'foo0')
        self.assertEqual(db1.get('foo'), b'foo1')
        self.assertEqual(db2.get('foo'), b'foo2')

def test_from_url_with_db_arg(self):
        db = fakeredis.FakeStrictRedis.from_url(
            'redis://username:password@localhost:6379/0')
        db1 = fakeredis.FakeStrictRedis.from_url(
            'redis://username:password@localhost:6379/1')
        db2 = fakeredis.FakeStrictRedis.from_url(
            'redis://username:password@localhost:6379/',
            db=2)
        db.set('foo', 'foo0')
        db1.set('foo', 'foo1')
        db2.set('foo', 'foo2')
        self.assertEqual(db.get('foo'), b'foo0')
        self.assertEqual(db1.get('foo'), b'foo1')
        self.assertEqual(db2.get('foo'), b'foo2')

def test_from_url_db_value_error(self):
        # In ValueError, should default to 0
        db = fakeredis.FakeStrictRedis.from_url(
            'redis://username:password@localhost:6379/a')
        self.assertEqual(db._db_num, 0)