def test_filter(self):
t = Table([
Record(x=1, y=2, z=3),
Record(x=2, y=2, z=3),
Record(x=1, y=2, z=4),
Record(x=2, y=1, z=3),
Record(x=1, y=2, z=3),
Record(x=3, y=3, z=4),
])
assert t.filter(lambda r: r.z > 3) == Table([
Record(x=1, y=2, z=4),
Record(x=3, y=3, z=4),
])
