def test_basic_sub():
assert calculate('10 5 -') == 5
assert calculate('10 20 -') == -10
assert calculate('200 200 -') == 0
def test_sqrt():
assert calculate('4 sqrt') == 2
def test_basic_sum():
assert calculate('2 2 +') == 4
assert calculate('20 3 +') == 23
assert calculate('0 2 +') == 2
def test_float_negative_sum():
assert calculate('-2.2 2.5 +') == approx(0.3)
def test_float_sub():
assert calculate('5.2 1.1 -') == 4.1
assert calculate('0 9.8 -') == -9.8
assert calculate('120.45 0 -') == 120.45
def test_float_sum():
assert calculate('2.2 2.5 +') == 4.7
assert calculate('0.2 0 +') == 0.2
assert calculate('10 0.125 +') == 10.125
def test_basic_div():
assert calculate('1 10 /') == 0.1
assert calculate('10 2 /') == 5
assert calculate('0 9 /') == 0
def test_basic_mult():
assert calculate('6 3 *') == 18
assert calculate('900 1 *') == 900
assert calculate('10 0 *') == 0