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Working Effectively with Legacy Code (draft)

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Andrea Francia
Andrea Francia

The document discusses Michael Feather's book "Working Effectively with Legacy Code" which provides an approach for refactoring and modifying legacy code using automatic tests. It defines legacy code as code without automatic tests which leads to risks in changing the code. The approach involves writing characterization tests that describe the actual behavior of the existing code to use as regression tests during refactoring. An example is provided of writing characterization tests for a method to illustrate testing existing behavior before refactoring.

TechnologyEducation
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Working Effectively with Legacy Code written by Michael Feathers Something I understand about the book
Contents ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The Book ,[object Object],[object Object],http://www.amazon.com/Working-Effectively-Legacy-Michael-Feathers/dp/0131177052 Paperback:  456 pages Publisher:  Prentice Hall PTR; 1 edition (October 2, 2004)
What is legacy code? (for me/us?) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What is legacy code? (M.Feathers) ,[object Object],[object Object],[object Object]
The conservative approach ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],If it ain't broke don't fix it
Preserving Behaviour with Characterization Tests ,[object Object],[object Object],[object Object],Please note that: “actual” is not always the same as “correct”.
Characterization Tests Example (1/5) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Characterization Tests Example (2/5) ,[object Object],[object Object],[object Object],[object Object],Testcase: testSlaDjcl(prova.ProvaTest): FAILED array lengths differed, expected.length=0 actual.length=3 junit.framework.AssertionFailedError: array lengths differed, expected.length=0 actual.length=3 at prova.ProvaTest.testSlaDjcl(ProvaTest.java:19)
Characterization Tests Example (3/5) ,[object Object],[object Object],[object Object],[object Object],Testcase: testSlaDjcl(prova.ProvaTest): Caused an ERROR arrays first differed at element [0]; expected:<0> but was:<1858> arrays first differed at element [0]; expected:<0> but was:<1858> at prova.ProvaTest.testSlaDjcl(ProvaTest.java:19)
Characterization Tests Example (4/5) ,[object Object],[object Object],[object Object],[object Object],BUILD SUCCESSFUL (total time: 0 seconds)
Characterization Tests Example (5/5) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The TDD algorithm ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Conclusions: Complaints / Solutions matrix So then you ... But legacy code… add them (as characterization tests) lacks of test redesign it (with refactoring) is ugly
Conclusions: I can’t put code under tests because So you I can’t because code ,[object Object],[object Object],depends of everything ,[object Object],[object Object],lacks of modularity
Thanks ,[object Object],[object Object],[object Object],[object Object],[object Object]

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Working Effectively with Legacy Code (draft)

  • 1. Working Effectively with Legacy Code written by Michael Feathers Something I understand about the book
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  • 14. Conclusions: Complaints / Solutions matrix So then you ... But legacy code… add them (as characterization tests) lacks of test redesign it (with refactoring) is ugly
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Editor's Notes

  1. M