
PASS testing calc(20px + calc(80px)) 
PASS testing calc(calc(100px)) 
PASS testing calc(calc(2) * calc(50px) 
PASS testing calc(calc(150px*2/3) 
PASS testing calc(calc(2 * calc(calc(3)) + 4) * 10px) 
FAIL testing calc(50px + calc(40%)) assert_equals: expected "calc(40% + 50px)" but got "calc(50px + 40%)"