def test_fatir2(): assert fatir(2) == 2
def test_fatir5(): assert fatir(5) == 120
def Test_fatir1(): assert fatir(1) == 1
def test_fatir0(): assert fatir(0) == 1
def test_fatir2(): assert fatir(2) == 2
def test_fatir5(): assert fatir(5) == 120
def Test_fatir1(): assert fatir(1) == 1
def test_fatir0(): assert fatir(0) == 1