def test_value_requires_numbers(self):
Value(23)
Value(23.5)
with self.assertRaises(TypeError):
Value("100")
with self.assertRaises(TypeError):
Value(True)
def test_error_requires_numbers(self):
Value(23, 1)
Value(23, 0.5)
with self.assertRaises(TypeError):
Value(23, "100")
with self.assertRaises(TypeError):
Value(23, True)
def test_value_greater_equal_than_value(self):
val1 = Value(19, 0.4)
val2 = Value(19, 0.5)
val3 = Value(17, 0.5)
self.assertTrue(val2 >= val1)
self.assertTrue(val1 <= val2)
self.assertTrue(val2 >= val3)
def test_can_add_values(self):
val1 = Value(23, 5)
val2 = Value(19, 1)
val3 = val1 + val2
self.assertIsInstance(val3, Value)
self.assertEqual(val3._value, 42)
self.assertAlmostEqual(val3._error, 5.1, delta=0.05)
def test_can_multiply_negative_values(self, mock_err):
mock_err.side_effect = (0.025, 0.06)
val1 = Value(-2, 0.08)
val2 = Value(3, 0.05)
val3 = val1 * val2
self.assertIsInstance(val3, Value)
self.assertEqual(val3._value, -6)
self.assertAlmostEqual(val3._error, 0.39)
def test_can_divide_negative_values(self, mock_err):
mock_err.side_effect = (4, 3)
val1 = Value(12, 48)
val2 = Value(-4, 12)
val3 = val1 / val2
self.assertIsInstance(val3, Value)
self.assertEqual(val3._value, -3)
self.assertEqual(val3._error, 15)
def test_can_create_value_from_value(self):
value = Mock(Value)
value._value = 10
value._error = 2
val = Value(value)
self.assertEqual(val._value, 10)
self.assertEqual(val._error, 0)
def test_can_add_number_to_value(self):
val1 = 23
val2 = Value(19, 0.4)
val3 = val1 + val2
self.assertIsInstance(val3, Value)
self.assertEqual(val3._value, 42)
self.assertEqual(val3._error, 0.4)
def test_can_subtract_value_from_number(self):
val1 = Value(23, 0.5)
val2 = 19.0
val3 = val2 - val1
self.assertIsInstance(val3, Value)
self.assertEqual(val3._value, -4)
self.assertEqual(val3._error, 0.5)
def test_can_raise_value_to_negative_power(self, mock_err):
mock_err.return_value = 0.01
val1 = Value(2, 0.02)
val = val1**-2
self.assertIsInstance(val, Value)
self.assertEqual(val._value, 0.25)
self.assertEqual(val._error, 0.005)
def test_can_subtract_number_from_value(self):
val1 = 23
val2 = Value(19, 0.4)
val3 = val2 - val1
self.assertIsInstance(val3, Value)
self.assertEqual(val3._value, -4)
self.assertEqual(val3._error, 0.4)
def test_can_add_value_to_number(self):
val1 = Value(23, 0.5)
val2 = 19.0
val3 = val1 + val2
self.assertIsInstance(val3, Value)
self.assertEqual(val3._value, 42)
self.assertEqual(val3._error, 0.5)
def test_can_multiply_number_with_value(self, mock_err):
mock_err.return_value = 0.06
val1 = 2
val2 = Value(3, 0.05)
val3 = val1 * val2
self.assertIsInstance(val3, Value)
self.assertEqual(val3._value, 6)
self.assertAlmostEqual(val3._error, 0.36)
def test_can_divide_value_by_number(self, mock_err):
mock_err.return_value = 0.025
val1 = Value(12, 48)
val2 = 4.0
val3 = val1 / val2
self.assertIsInstance(val3, Value)
self.assertEqual(val3._value, 3)
self.assertAlmostEqual(val3._error, 0.075, delta=0.000005)
def test_can_divide_number_by_value(self, mock_err):
mock_err.return_value = 0.06
val1 = 12
val2 = Value(4, 12)
val3 = val1 / val2
self.assertIsInstance(val3, Value)
self.assertEqual(val3._value, 3)
self.assertAlmostEqual(val3._error, 0.18, delta=0.000005)
def test_can_multiply_value_with_number(self, mock_err):
mock_err.return_value = 0.025
val1 = Value(2, 0.08)
val2 = 3
val3 = val1 * val2
self.assertIsInstance(val3, Value)
self.assertEqual(val3._value, 6)
self.assertAlmostEqual(val3._error, 0.15)
def test_can_raise_value_to_power(self, mock_err):
mock_err.return_value = 0.01
val1 = Value(2, 0.02)
val2 = 3
val3 = val1**val2
self.assertIsInstance(val3, Value)
self.assertEqual(val3._value, 8)
self.assertEqual(val3._error, 0.24)
def test_can_get_consistency_with_non_value(self):
val1 = Value(9.87, 0.09)
val2 = 9.81
self.assertTrue(val1.consistent_with(val2))
val2 = 9.78
self.assertTrue(val1.consistent_with(val2))
val2 = 9.7799
self.assertFalse(val1.consistent_with(val2))
def test_can_raise_negative_value_to_power(self, mock_err):
mock_err.return_value = 0.01
val1 = Value(-2, 0.02)
val = val1**2
self.assertIsInstance(val, Value)
self.assertEqual(val._value, 4)
self.assertEqual(val._error, 0.08)
val = val1**3
self.assertIsInstance(val, Value)
self.assertEqual(val._value, -8)
self.assertEqual(val._error, 0.24)
def test_can_get_error_range(self):
val = Value(100, 2)
self.assertEqual(val.error_range(), (98, 102))
def test_repr_with_error(self):
val = Value(23, 0.5)
self.assertEqual(str(val), '23 ± 0.5')
def test_repr_with_no_error(self):
val = Value(23)
self.assertEqual(str(val), '23')
def test_can_create_simple_value(self):
val = Value(10)
self.assertEqual(val._value, 10)
self.assertEqual(val._error, 0)
def test_error_must_be_positive(self):
with self.assertRaises(ValueError):
Value(23, -0.01)
def test_cannot_get_consistency_with_non_number(self):
val1 = Value(9.87, 0.09)
with self.assertRaises(TypeError):
val1.consistent_with("value")
def test_can_get_inconsistent_results(self):
val1 = Value(3.30001, 0.2)
val2 = Mock(Value)
val2.value.return_value = 3.0
val2.error.return_value = 0.1
self.assertFalse(val1.consistent_with(val2))
def test_can_get_relative_error_when_value_is_zero(self):
val = Value(0, 2)
self.assertEqual(val.relative_error(), 0)
def test_can_get_relative_error_when_value_is_negative(self):
val = Value(-100, 2)
self.assertEqual(val.relative_error(), 0.02)
def test_can_get_relative_error(self):
val = Value(100, 2)
self.assertEqual(val.relative_error(), 0.02)
def test_can_get_consistent_results(self):
val1 = Value(3.3, 0.2)
val2 = Mock(Value)
val2.value.return_value = 3.1
val2.error.return_value = 0.1
self.assertTrue(val1.consistent_with(val2))
