python assertRaises code example
Example 1: python assert
"""Quick note!
This code snippet has been copied by Pseudo Balls.
This is the original answer.
Please consider justice by ignoring his answer.
"""
"""assert:
evaluates an expression and raises AssertionError
if expression returns False
"""
assert 1 == 1
assert False
assert 1 + 1 == 3, "1 + 1 does not equal 3"
"""When line 7 is run:
AssertionError: 1 + 1 does not equal 3
"""
Example 2: assert python
x = "hello"
assert x == "goodbye", "x should be 'hello'"
-----------------------------------------------------------------
Traceback (most recent call last):
File "demo_ref_keyword_assert2.py", line 4, in <module>
assert x == "goodbye", "x should be 'hello'"
AssertionError: x should be 'hello'
Example 3: assert python 3
def test_math():
assert(1 + 1 == 2)
Example 4: unittest python how set test failed
import unittest
class TestStringMethods(unittest.TestCase):
def test_upper(self):
self.assertEqual('foo'.upper(), 'FOO')
def test_isupper(self):
self.assertTrue('FOO'.isupper())
self.assertFalse('Foo'.isupper())
def test_split(self):
s = 'hello world'
self.assertEqual(s.split(), ['hello', 'world'])
with self.assertRaises(TypeError):
s.split(2)
if __name__ == '__main__':
unittest.main()
Example 5: how to use assert in python
assert type(num) is int,"num must be an integer"
Example 6: python unittest setUpClass
class MyUnitTest(unittest.TestCase):
@classmethod
def setUpClass(cls):
do_something_expensive_for_all_sets_of_tests()
class MyFirstSetOfTests(MyUnitTest):
@classmethod
def setUpClass(cls):
super(MyFirstSetOfTests, cls).setUpClass()
do_something_expensive_for_just_these_first_tests()