TDD in the ABAP world - sitNL 2013 edition
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This document discusses unit testing and test-driven development (TDD) in ABAP. It defines unit testing as a method to test individual units of code, such as methods and functions, to find bugs early. An xUnit framework provides automated testing with setup, test, and teardown methods. SAP's implementation is called ABAP Unit. TDD involves writing tests before code is written in a cycle of red, green, refactor to drive the development process. The document concludes with a code kata example to practice TDD with converting numbers to Roman numerals.
TDD in the ABAP world - sitNL 2013 edition
- 1. TDD in the ABAP World Hendrik Neumann #sitNL 2013 © 2013 evivax IT Consulting GmbH
- 2. Agenda (1) Unit Testing & ABAP Unit (2) Test Driven Development (TDD) (3) Live Coding
- 3. Unit Testing & ABAP Unit © 2013 evivax IT Consulting GmbH
- 5. Unit Testing Unit Testing is a method by which individual units of source code are tested to determine if they are fit to use.
- 6. Unit Testing Unit Testing is a method by which individual units are e.g.ource code fittMethods of t Methods Function Modules fit Function Groups fiMoModule Pools Function Functn Reports
- 7. Unit Testing aim: Find bugs early Write once, run often Effective Tests must be automated solution: xUnit Frameworks
- 9. xUnit Framework Provides an automated solution with no need to write the same tests many times and no need to remember what should be the result of each test.
- 10. xUnit Framework How does it work?
- 11. xUnit Framework setup() Create object under test common to all tests.
- 12. xUnit Framework Call Clear up object under test – e.g. a mess.. method public your with test data. setup() test_method()
- 13. xUnit Framework assert_*()–methods setup() test_method() Verify output of object under test using xUnit‘s assert methods
- 14. xUnit Framework Clear up your mess.. setup() test_method()teardown()
- 15. xUnit Framework test_method() test_method() test_method() setup() test_method()teardown() test_method() test_method() test_method()
- 16. ABAP Unit © 2013 evivax IT Consulting GmbH
- 17. ABAP Unit SAP‘s xUnit implemenation
- 18. ABAP Unit Local test classes for global development artifacts In Reports, Function Modules and Classes Not acitve on production systems
- 19. ABAP Unit • Tools integration: – ABAP Workbench – Code Inspector Integration – ABAP Unit Browser – ABAP Test Cockpit (ATC) – ABAP in Eclipse
- 20. Test Driven Development © 2013 evivax IT Consulting GmbH
- 21. Test Driven Development When do you write your Unit Tests? • Never • After you wrote your code • Before you write your code
- 22. Test Driven Development When do you write your Unit Tests? • Never • After you wrote your code • Before you write your code Test Driven Development
- 23. Test Driven Development Test 1st
- 24. Test Cycle Test Write a test that expresses how you’ll use the code and what you need it to do.
- 25. Test Cycle Test Write enough code to get the test to pass, but no more. Code
- 26. Test Cycle Test Refactor Clean up the code to remove redundancy and improve the design. Code
- 31. Code Kata: Roman Numerals Rules: • • • • smaller number in front of a larger number subtraction all else addition put only one smaller number in front of a larger number ones, tens, hundreds and thousands are separate items I The numeral one. II is two, III is three. V The numeral 5. IV is 4, VI is 6, VII is 7, VIII is 8. X The numeral 10. IX is 9, XI is 11, etc. L The numeral 50. XL would be 40. C The numeral 100. C is short for the Latin word Centum, but Century is eaysier to remember ;-) D The numeral 500. M The numeral 1000.
- 32. So Long, and Thanks for All the Fish Any Qs? © 2013 evivax IT Consulting GmbH
- 33. Green Bar Patterns (hidden track) © 2013 evivax IT Consulting GmbH
- 34. Green Bar Patterns Fake it till you make it • Start with hardcoded results and wait until tests force them to become real
- 35. Green Bar Patterns Triangulate To Abstraction • Make the code abstract only when you have two or more examples
- 36. Green Bar Patterns Obvious Implementation • aka Don‘t be stupid • If you really know the right way to implement it, do it that way