def test_not_numeric_values_in_list(self):
"""
This test checks if the function deals correctly with list with not numeric values given as an argument.
"""
with self.assertRaises(TypeError) as error:
variance([1, 'a'])
self.assertEqual(
error.exception.args[0],
'argument of the function must be a list of values of type int '
'or float')
def test_not_a_list(self):
"""
This test checks if the function deals correctly with not a list argument.
"""
with self.assertRaises(TypeError) as error:
variance('a')
self.assertEqual(
error.exception.args[0],
'argument of the function must be a list of values of type int '
'or float')
def test_harder_test(self):
"""
This test checks if the function deals correctly with list [1.21, -3.42, 5.56, 112.86, -34].
"""
self.assertAlmostEqual(variance([1.21, -3.42, 5.56, 112.86, -34]),
2517.1513760000003,
delta=0.0001)
def test_variance(self):
self.assertEqual(stats.variance([1, 2, 3, 4, 5]), 2.5)
def test_simple_int_list(self):
"""
This test checks if the function deals correctly with list [1, 2, 3, 4, 5].
"""
self.assertEqual(variance([1, 2, 3, 4, 5]), 2.0)
def test_one_element(self):
"""
This test checks if the function deals correctly with list of one element.
"""
self.assertEqual(variance([1]), 0.0)