def test_extract_comps(self):
cases = [('x == 3', ['x == 3']),
('x == 3 and y == 4', ['x == 3', 'y == 4']),
('x < 3 and not y > 4', ['x < 3', 'y > 4']),
('x < 3 + (y > 4)', ['x < (3 + (y > 4))', 'y > 4']),
]
for expr, comps in cases:
result = ExprManip.extract_comps(expr)
assert result == sets.Set(comps)
