def test_subtract():
x = 1
y = 2
expected = -1
obtained = c.subtract(x, y)
assert expected == obtained
class TDDPythonExample(unittest.TestCase):
def setUp(self):
self.calc = Calculator()
def test_calculator_add_method_returns_correct_value(self):
result = self.calc.add(2, 2)
self.assertEqual(4, result)
def test_calculator_add_error_message_if_both_args_are_not_numbers(self):
self.assertRaises(ValueError, self.calc.add, 'one', 'two')
def test_calculator_subtract_method_returns_correct_value(self):
result = self.calc.subtract(4, 2)
self.assertEqual(2, result)
def test_calculator_subtract_error_message_if_both_args_are_not_numbers(
self):
self.assertRaises(ValueError, self.calc.subtract, 'one', 'two')
def test_calculator_multiply_method_returns_correct_value(self):
result = self.calc.multiply(4, 2)
self.assertEqual(8, result)
def test_calculator_multiply_error_message_if_both_args_are_not_numbers(
self):
self.assertRaises(ValueError, self.calc.multiply, 'one', 'two')
class CalculatorTest(unittest.TestCase):
def setUp(self):
self.calc = Calculator()
def test_calculator_add_method_returns_correct_result(self):
result = self.calc.add(2, 2)
self.assertEqual(4, result)
def test_calculator_add_method_raise_error_on_wrong_input(self):
self.assertRaises(ValueError, self.calc.add, 'two', 'three')
self.assertRaises(ValueError, self.calc.add, 1, 'a')
def test_calculator_subtract_method_returns_correct_result(self):
result = self.calc.subtract(4, 1)
self.assertEqual(3, result)
def test_calculator_subtract_method_raise_error_on_wrong_input(self):
self.assertRaises(ValueError, self.calc.subtract, 'two', 'three')
self.assertRaises(ValueError, self.calc.subtract, 1, 'a')
def test_calculator_multiply_method_returns_correct_result(self):
result = self.calc.multiply(3, 4)
self.assertEqual(12, result)
def test_calculator_multiply_method_raise_error_on_wrong_input(self):
self.assertRaises(ValueError, self.calc.multiply, 'two', 'three')
self.assertRaises(ValueError, self.calc.multiply, 1, 'a')
def test_calculator_divide_method_returns_correct_result(self):
result = self.calc.divide(15, 5)
self.assertEqual(3, result)
def test_calculator_divide_method_raise_error_on_wrong_input(self):
self.assertRaises(ValueError, self.calc.divide, 'two', 'three')
self.assertRaises(ValueError, self.calc.divide, 1, 'a')
def test_calculator_divide_method_raise_error_on_divide_by_zero(self):
self.assertRaises(ZeroDivisionError, self.calc.divide, 16, 0)
def test_calculator_power_method_returns_correct_result(self):
result = self.calc.power(5, 3)
self.assertEqual(125, result)
def test_calculator_power_method_raise_error_on_wrong_input(self):
self.assertRaises(ValueError, self.calc.power, 'two', 'three')
self.assertRaises(ValueError, self.calc.power, 1, 'a')
def test_calculator_root_method_returns_correct_result(self):
result = self.calc.root(16, 2)
self.assertEqual(4, result)
result = self.calc.root(8, 3)
self.assertEqual(2, result)
def test_calculator_root_method_raise_error_on_wrong_input(self):
self.assertRaises(ValueError, self.calc.root, 'two', 'three')
self.assertRaises(ValueError, self.calc.root, 1, 'a')
def test_subtract(self):
calc = Calculator()
result = calc.subtract(4, 2)
self.assertEqual(2, result)
def test_subtract(self):
calc = Calculator()
result = calc.subtract(4,2)
self.assertEqual(2, result)
def test_subtract_bypositive(self):
result = Calculator.subtract(30,25)
self.assertEqual(result,5)
class TddInPythonExample(unittest.TestCase):
def setUp(self):
self.calc = Calculator()
# Correct result tests
def test_calculator_add_method_returns_correct_result(self):
result = self.calc.add(2, 2)
self.assertEqual(4, result)
def test_calculator_subtract_method_returns_correct_result(self):
result = self.calc.subtract(10, 2)
self.assertEqual(8, result)
def test_calculator_multiply_method_returns_correct_result(self):
result = self.calc.multiply(15, 3)
self.assertEqual(45, result)
def test_calculator_divide_method_returns_correct_result(self):
result = self.calc.divide(100, 5)
self.assertEqual(20, result)
# Test for when both args are not numbers
def test_calculator_add_if_both_args_are_not_numbers(self):
self.assertRaises(ValueError, self.calc.add, 'two', 'three')
def test_calculator_subtract_if_both_args_are_not_numbers(self):
self.assertRaises(ValueError, self.calc.subtract, [1, 2, 3], 'three')
def test_calculator_multiply_if_both_args_are_not_numbers(self):
self.assertRaises(ValueError, self.calc.multiply, {'one': '1'}, '2')
def test_calculator_divide_if_both_args_are_not_numbers(self):
self.assertRaises(ValueError, self.calc.divide, (1, 3, 5), 'eleven')
# Tests for when x is not a number
def test_calculator_add_returns_error_message_if_x_arg_not_number(self):
self.assertRaises(ValueError, self.calc.add, 'two', 3)
def test_calculator_subtract_returns_error_message_if_x_arg_not_number(
self):
self.assertRaises(ValueError, self.calc.subtract, (2, 4), 3)
def test_calculator_multiply_returns_error_message_if_x_arg_not_number(
self):
self.assertRaises(ValueError, self.calc.multiply, {'x': 'four'}, 3)
def test_calculator_divide_returns_error_message_if_x_arg_not_number(self):
self.assertRaises(ValueError, self.calc.divide, [15], 3)
# Tests for when y is not a number
def test_calculator_add_returns_error_message_if_y_arg_not_number(self):
self.assertRaises(ValueError, self.calc.add, 2, 'three')
def test_calculator_subtract_returns_error_message_if_y_arg_not_number(
self):
self.assertRaises(ValueError, self.calc.subtract, 100, {'y': 'four'})
def test_calculator_multiply_returns_error_message_if_y_arg_not_number(
self):
self.assertRaises(ValueError, self.calc.multiply, 65, [15])
def test_calculator_divide_returns_error_message_if_y_arg_not_number(self):
self.assertRaises(ValueError, self.calc.divide, 2, (1, ))
# Test divide_by_zero
def test_calculator_divide_by_zero_returns_error_message(self):
self.assertRaises(ZeroDivisionError, self.calc.divide, 15, 0)
