def test_calculator_arithmetic(expression, answer):
calc = RPCalc()
for element in expression:
calc.push(element)
assert calc.peek() == answer, \
f"expected an answer of {answer}"
def test_peek_implemented():
assert hasattr(RPCalc(), 'peek'), \
"peek not implemented"
def test_peek():
calc = RPCalc()
calc.push(1)
calc.peek()
assert bool(calc), \
"expected non-empty stack"
def test_length():
calc = RPCalc()
calc.push(1)
calc.push(2)
calc.push("+")
assert len(calc) == 1
def test_pop():
calc = RPCalc()
calc.push(1)
calc.pop()
assert not bool(calc), \
"expected empty stack"
def test_pop_implemented():
assert hasattr(RPCalc(), 'pop'), \
"pop not implemented"
def test_length_implemented():
assert hasattr(RPCalc(), '__len__'), \
"RPCalc has no len special method"
def test_push(elements):
calc = RPCalc()
for element in elements:
calc.push(element)
def test_push_implemented():
assert hasattr(RPCalc(), 'push'), \
"push not implemented"
def test_peek_implemented():
assert hasattr(RPCalc(), "peek"), "peek not implemented"
def test_pop_implemented():
assert hasattr(RPCalc(), "pop"), "pop not implemented"
def test_push_implemented():
assert hasattr(RPCalc(), "push"), "push not implemented"