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Stopping the Rot - Putting Legacy C++ Under Test

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Seb Rose
Seb Rose

The document discusses introducing unit testing to legacy C++ code. It covers choosing a testing framework, writing initial tests and mocks, and various refactoring techniques like wrapping dependencies, extracting components, and adding non-intrusive C seams to facilitate testing. The goal is to incrementally make the code more testable while maintaining functionality through practices like test-driven development.

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Stopping the rot Putting legacy C++ under test Seb Rose ACCU 2011
Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
A brief history of DOORS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Challenges ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
New direction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Why Unit Test? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
When to write Unit Tests? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Unit Test guidelines ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
How to write the first Unit Test ,[object Object],[object Object],[object Object],[object Object]
A test is not a unit test if: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Which framework to use? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Googletest ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Googlemock ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
The first test ,[object Object],[object Object],[object Object],[object Object],[object Object]
The first mock (1) ,[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 first mock (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Another Mock (1) ,[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]
Another Mock (2) ,[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]
Another Mock (3) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Wrap Dependency ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Test Doubles ,[object Object],[object Object],[object Object],[object Object],[object Object]
Code Under Test ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Test The Defect ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Describe Behaviour ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Refactor Code Under Test ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Modify the Test ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
After the test passes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Extract Component ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Tests Application Before Refactoring During Unit Test Interesting Code Application While App Executes main Interesting Code
Simple Extraction Not Enough Interesting Code Utility Functionality Application main ,[object Object],[object Object],Tests
Break Dependency ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Modify Utility Code ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Full extraction ,[object Object],[object Object],[object Object],[object Object],[object Object]
Tests After Refactoring During Unit Test Utility Functionality <<interface>> Mock Dependencies Application Interesting Code Utility Functionality <<interface>> Application Dependencies Application While App Executes main Interesting Code 1. Inject Dependencies 2. Run Application
Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Original code ,[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],db_initialize startup
How to unit test? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Non-Intrusive C Seam ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Create new interface ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],db_initialize startup Database
Move legacy code into namespace ,[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],startup db_initialize Global namespace Legacy namespace Database
Implement the new interface ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],startup Global namespace db_initialize Database LegacyDatabase Legacy namespace
Create a shim ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],startup db_initialize shim Database LegacyDatabase Global namespace Legacy namespace
Redirect client to shim ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],startup db_initialize shim Database LegacyDatabase Global namespace Legacy namespace
Schematic of transformation db_initialize startup Before After Global namespace startup db_initialize shim Database LegacyDatabase Global namespace Legacy namespace
What have we achieved? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Are we there yet? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Conclusions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Musical trivia ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Stopping the Rot - Putting Legacy C++ Under Test

  • 1. Stopping the rot Putting legacy C++ under test Seb Rose ACCU 2011
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  • 35. Tests Application Before Refactoring During Unit Test Interesting Code Application While App Executes main Interesting Code
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  • 40. Tests After Refactoring During Unit Test Utility Functionality <<interface>> Mock Dependencies Application Interesting Code Utility Functionality <<interface>> Application Dependencies Application While App Executes main Interesting Code 1. Inject Dependencies 2. Run Application
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  • 50. Schematic of transformation db_initialize startup Before After Global namespace startup db_initialize shim Database LegacyDatabase Global namespace Legacy namespace
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Editor's Notes

  1. Spaghetti code; Big Ball of Mud
  2. “ Islands of test”
  3. Spaghetti code; Big Ball of Mud