def test_equals_rule():
rule = "a == a"
assert_equal(rule, str(Rule(rule)))
rule2 = "a == a and a == a"
assert_equal(rule, str(Rule(rule2)))
rule3 = "a < 3.0 and a == a"
assert_equal(rule3, str(Rule(rule3)))
def test_hash_rule():
assert_equal(len({
Rule('a <= 2 and a <= 3'),
Rule('a <= 2')
}), 1)
assert_not_equal(len({
Rule('a <= 4 and a <= 3'),
Rule('a <= 2')
}), 1)
def test_rule():
assert_equal(Rule('a <= 10 and a <= 12'),
Rule('a <= 10'))
assert_equal(Rule('a <= 10 and a <= 12 and a > 3'),
Rule('a > 3 and a <= 10'))
assert_equal(Rule('a <= 10 and a <= 10 and a > 3'),
Rule('a > 3 and a <= 10'))
assert_equal(Rule('a <= 10 and a <= 12 and b > 3 and b > 6'),
Rule('a <= 10 and b > 6'))
assert_equal(len({Rule('a <= 2 and a <= 3'),
Rule('a <= 2')
}), 1)
assert_equal(len({Rule('a > 2 and a > 3 and b <= 2 and b <= 3'),
Rule('a > 3 and b <= 2')
}), 1)
assert_equal(len({Rule('a <= 3 and b <= 2'),
Rule('b <= 2 and a <= 3')
}), 1)
def test_str_rule():
rule = 'a <= 10.0 and b > 3.0'
assert_equal(rule, str(Rule(rule)))