Test Driven Development in Python

Test Driven Development in Python

• 1.
  Test Driven Developmentin Python Anoop Thomas Mathew Agiliq Info Solutions Pvt. Ltd.
• 2.
  Overview ● About TDD ● TDD and Python ● unittests ● Developing with Tests ● Concluding Remarks ● Open Discussion
• 3.
  “ Walking onwater and developing software from a specification are easy if both are frozen. ” - Edward V Berard
• 4.
  About Test DrivenDevelopment (TDD) ● Write tests for the use case ● Run it (make sure it fails and fails miserably) ● Write code and implement the required functionality with relevant level of detail ● Run the test ● Write test for addition features ● Run all test ● Watch it succeed. Have a cup of coffee !
• 5.
  Advantages of TDD ● application is determined by using it ● written minimal amount of application code – total application + tests is probably more – objects: simpler, stand-alone, minimal dependencies ● tends to result in extensible architectures ● instant feedback
• 6.
  Unittest import unittest class MyTest(unittest.TestCase): def testMethod(self): self.assertEqual(1 + 2, 3, "1 + 2 !=3") if __name__ == '__main__': unittest.main()
• 7.
  import unittest from demoimport Greater The Test class DemoTest(unittest.TestCase): def test_number(self): comparator = Greater() result = comparator.greater(10,5) self.assertTrue(result) def test_char(self): comparator = Greater() result = comparator.greater('abcxyz', 'AB') self.assertTrue(result) def test_char_equal(self): comparator = Greater() result = comparator.greater('4', 3) self.assertTrue(result) if __name__ == '__main__': unittest.main()
• 8.
  class Greater(object): The Program def greater(self, val1, val2): if type(val1) ==str or type(val2) == str: val1 = str(val1) val2 = str(val2) sum1 = sum([ord(i) for i in val1]) sum2 = sum([ord(i) for i in val2]) if sum1 > sum2: return True else: return False if val1>val2: return True else: return False
• 9.
  Test Again 1. Addnew test for features/bugs 2. Resolve the issue, make the test succeed. 3. Iterate from Step 1
• 10.
  Beware!!! Murphy is everywhere.
• 11.
  Let's Discuss