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ABAPCodeRetreat Frankfurt 2016 - TDD with ABAP

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ABAP CodeRetreat Frankfurt 2016. TDD talk by Hendrik Neumann

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ABAPCodeRetreat Frankfurt 2016 - TDD with ABAP

  1. 1. TDD – Test Driven Development Hendrik Neumann
  2. 2. Agenda (1) Unit Testing (2) ABAP Unit (3) Test Driven Development
  3. 3. Unit Testing
  4. 4. Unit Testing Definition
  5. 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. 6. Unit Testing Unit Testing is a method by which individual units are e.g.ource code fittMethods of t Function Modules fit Function Groups fiMoModule Pools Function Functn Reports Methods Function Groups
  7. 7. Unit Testing aim: Find bugs early Write once, run often Effective Tests must be automated solution: xUnit Frameworks
  8. 8. xUnit Framework
  9. 9. xUnit Framework Definition
  10. 10. 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.
  11. 11. xUnit Framework How does it work?
  12. 12. xUnit Framework setup() creates object under test – used in all tests
  13. 13. xUnit Framework setup()  test_method() Clear up your mess.. calls object under test – e.g. a public method with test data
  14. 14. xUnit Framework setup()  test_method() assert_*()–methods verify the return value of the object under test using xUnit’s assert methods
  15. 15. xUnit Framework setup()  test_method() teardown() Clear up your mess..
  16. 16. xUnit Framework setup()  test_method() teardown() test_method() test_method() test_method() test_method() test_method() test_method()
  17. 17. ABAP Unit
  18. 18. ABAP Unit SAP‘s xUnit implemenation
  19. 19. ABAP Unit cl_abap_unit_assert=>assert_equals( msg = 'Test msg' act = act exp = out->( ) ).
  20. 20. assert_*()-Methods
  21. 21. ABAP Unit in ADT
  22. 22. ABAP Unit Local test classes for global development artifacts In Reports, Function Modules and Classes Not acitve on production systems
  23. 23. ABAP Unit • Tools integration: –ABAP Workbench –Code Inspector Integration –ABAP Unit Browser –ABAP Test Cockpit (ATC) –ABAP in Eclipse
  24. 24. Test Driven Development
  25. 25. Test Driven Development • Never • After you wrote your code • Before you write your code When do you write your Unit Tests?
  26. 26. Test Driven Development • Never • After you wrote your code • Before you write your code When do you write your Unit Tests? Test Driven Development
  27. 27. Test Driven Development Test 1st
  28. 28. Test Cycle Test Write a test that expresses how you’ll use the code and what you need it to do.
  29. 29. Test Cycle Write enough code to get the test to pass, but no more. Code Test
  30. 30. Test Cycle Code Test Refactor Clean up the code to remove redundancy and improve the design.
  31. 31. Test Cycle Code Test Refactor
  32. 32. Test Cycle Code Test Refactor
  33. 33. Test Cycle Code Test Refactor
  34. 34. Test Cycle Code Test Refactor
  35. 35. Green Bar Patterns
  36. 36. Green Bar Patterns Fake it till you make it • Start with hardcoded results and wait until tests force them to become real
  37. 37. Green Bar Patterns Triangulate To Abstraction • Make the code abstract only when you have two or more examples
  38. 38. Green Bar Patterns Obvious Implementation • aka Don‘t be stupid • If you really know the right way to implement it, do it that way
  39. 39. Have FUN!
  40. 40. Backup
  41. 41. 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.

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