def METHOD_NAME(self):
    m1 = MetaData()
    m2 = MetaData()
    Table(
        "some_table",
        m1,
        Column("test", String(10), primary_key=True),
        Column("amount", Float),
    )
    Table(
        "some_table",
        m2,
        Column("test", String(10), primary_key=True),
        Column("amount", Float, comment="the amount"),
    )
    diffs = self._fixture(m1, m2)
    eq_(
        diffs,
        [
            [
                (
                    "modify_comment",
                    None,
                    "some_table",
                    "amount",
                    {
                        "existing_nullable": True,
                        "existing_type": mock.ANY,
                        "existing_server_default": False,
                    },
                    None,
                    "the amount",
                )
            ]
        ],
    )