def test_subtracting_two_numbers():
# ARRANGE #
calc = Calculator()
# ACT #
actual = calc.subtract(1, 1)
expected = 0
# ASSERT #
assert actual == expected
def test_subtracting_number_from_latest_calculation():
# ARRANGE #
calc = Calculator(1)
# ACT #
actual = calc.subtract(1)
expected = 0
# ASSERT #
assert actual == expected
def test_instantiation_with_zero_as_default_calculation():
# ARRANGE #
calc = Calculator()
# ACT #
actual = calc.get_last_calculation()
expected = 0
# ASSERT #
assert actual == expected
def test_adding_number_to_latest_calculation():
# ARRANGE #
calc = Calculator(1)
# ACT #
actual = calc.add(1)
expected = 2
# ASSERT #
assert actual == expected
def test_adding_two_numbers():
# ARRANGE #
calc = Calculator()
# ACT #
actual = calc.add(1, 1)
expected = 2
# ASSERT #
assert actual == expected
def test_instantiation_with_initial_calculation():
# ARRANGE #
calc = Calculator(1 + 1)
# ACT #
actual = calc.get_last_calculation()
expected = 2
# ASSERT #
assert actual == expected
def test_adding_only_numbers():
# ARRANGE #
calc = Calculator()
# ACT #
actual1 = calc.add(1, "not a number")
expected1 = "INVALID INPUT"
actual2 = calc.add("not a number", "not a number")
expected2 = "INVALID INPUT"
actual3 = calc.add("not a number")
expected3 = "INVALID INPUT"
# ASSERT #
assert actual1 == expected1
assert actual2 == expected2
assert actual3 == expected3