tdd.py

def somar(a, b):
    pass

def subtrair(a, b):
    pass

def dividir(a, b):
    pass

def multiplicar(a, b):
    pass

# Testes
def testar_somar(val1, val2, res):
    resultado = somar(val1, val2)
    if resultado == res:
        print("passou")
    else:
        print("não passou")

def testar_subtrair(val1, val2, res):
    assert subtrair(val1, val2) == res


testar_somar(2, 1, 3)
testar_subtrair(5, 4, 1)