def test_cons():
a = 3
b = 4
def pair(f):
return f(a,b)
result = solution.cons(a,b)
assert isinstance(result,type(pair))
def test_cdr():
expected = 4
result = solution.cdr(solution.cons(3,4))
assert result == expected
def test_cdr_alt():
expected = 7
result = solution.cdr_alt(solution.cons(8,7))
assert result == expected
def test_car():
expected = 3
result = solution.car(solution.cons(3,4))
assert result == expected