def test_Variable_eq():
var1 = Variable('test', rvalues=['a+b', 'c+d'])
var2 = Variable('test', rvalues=['a+b', 'c+d'])
var1.next()
assert var1 == var2
assert var1.idx == 1
assert var2.idx == 0
def test_Variable_next():
var1 = Variable('test')
var2 = Variable('test', rvalues=['a', 'b'])
assert var1.next() is False
assert var2.next() is True
assert var2.next() is False
assert var2.next() is False