def test_5_times_8_plus_7_times_3_returns_141():
assert calc("3 5 8 * 7 + *") == 141
def test_0_returns_0():
assert calc("0") == 0
def test_12_divided_by_4_returns_3():
assert calc("12 4 /") == 3
def test_12_minus_4_returns_8():
assert calc("12 4 -") == 8
def test_3_times_4_returns_12():
assert calc("3 4 *") == 12
def test_empty_string():
assert calc("") == 0
def test_2_plus_3_plus_4_returns_9():
assert calc("2 3 + 4 +") == 9
def test_2_plus_2_plus_2_returns_6():
assert calc("2 2 2 + +") == 6
def test_2_plus_2_returns_4():
assert calc("2 2 +") == 4
def test_2_returns_2():
assert calc("2") == 2
def is_solution(nums: Numbers, t: int) -> bool:
try:
return calc(nums) == t
except NotValidEqnError:
return False