2. Lots of different devices, browsers, and operating systems 3. User really will do that – no matter how silly it seems. 4. One person to hundreds of people, even more, are using it. 5. To ensure that what we create does what it’s supposed to do. http://www.te52.com/testtalk/2014/08/07/5-reasons-we-need-software-testing/ Precision and Accuracy, Validation, Reliability, and Quality Delivery of high quality product or software application to customers
application like functions, classes, procedures, interfaces. • Breaking your program into pieces, and subjecting each piece to a series of tests • should be done by the developers. http://istqbexamcertification.com/what-is-unit-testing/ Unit test is good, because • Issues are found at early stage • Unit testing helps in maintaining and changing the code • Reducing the cost of bug fixes. • Simplifying the debugging process
an error if the condition is false. if not condition: raise AssertionError() >>> assert True >>> assert False Traceback (most recent call last) : File "<stdin>", line 1, in <module> AssertionError Assert = https://docs.python.org/3/reference/simple_stmts.html#assert
are code-driven • By Kent Beck • Prescribes testing the fundamental units of software –examples: functions, methods, classes • Distinguishes between failures and errors in a unit of software Each Test case has four-phase: • Setup • Exercise • Verify (assertion) • Teardown (cleanup)
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']) # check that s.split fails when the separator is not a string with self.assertRaises (TypeError) : s. split(2) if __name__ == '__main__': unittest. main()
Implementing Software that relies on the repetition of a very short development cycle TDD is not • a developing Tool • a silver bullet for problems! • the ONLY way to write good software! ◦ But, if followed, will help you write solid software!
100. But for multiples of three print “Fizz” instead of the number and for the multiples of five print “Buzz”. For numbers which are multiples of both three and five print “FizzBuzz” FizzBuzz Problem http://codingdojo.org/kata/FizzBuzz/ Sample output
Kent Beck ◦ Extreme Programming Explained ◦ Test Driven Development: By Example Is TDD Dead? Test-Driven Development with Python Essential TDD (Test-Driven Development) for Pythoners, Pycontw 2016 RSpec & TDD Tutorial by ihower