def test_corr_negative_elements(self):
"""
Negative unittest for wrong input.
:returns: None; AssertionError -- if test fails
"""
with self.assertRaises(TypeError) as raised_exception:
correlation(['aaa', 2], [2, 3])
self.assertEqual(raised_exception.exception.args[0],
'elements of object should be int or float values')
def test_corr_negative_type(self):
"""
Negative unittest for wrong input.
:returns: None; AssertionError -- if test fails
"""
with self.assertRaises(TypeError) as raised_exception:
correlation(2, 3)
self.assertEqual(raised_exception.exception.args[0],
'object should be iterable')
def test_corr_missing_elements(self):
"""
Negative unittest for wrong input.
:returns: None; AssertionError -- if test fails
"""
with self.assertRaises(TypeError) as raised_exception:
correlation([2, 3])
self.assertEqual(
raised_exception.exception.args[0],
"correlation() missing 1 required positional argument: 'y'")
def test_corr_positive_type(self):
"""
Positive unittest for type correctness of result.
:returns: None; AssertionError -- if test fails
"""
x = correlation([1, 2, 3], [1, 2, 3])
self.assertIsInstance(x, float)
def test_corr_positive_zero(self):
"""
Positive unittest for correctness of function.
Checks if function returns correct result.
:returns: None; AssertionError -- if test fails
"""
x = correlation([1, 1, 1], [1, 1, 1])
self.assertEqual(x, 0)