Discover why unit testing is such an important practice in software development and learn about Test Driven Development, mocking and other code testing practices in .Net

1. Introduction to Unit Tests & TDD

2. UNIT TEST IN AN AGILE CONTEXT
Agile
XP
UT
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3. DEFINITION
A unit test confirms functionality of a
small unit of functionality or component
in a larger system
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•
•
•
Written by developers
isolate piece of code
No use of database or external ressources
Find problems early in dev cycle
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4. INITIAL REACTIONS
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5. BENEFITS
• Higher quality (less bug)
• Living documentation
• Well-crafted code
• Easier refactoring
• Automatic regression harness
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6. HOW UNIT TEST FRAMEWORKS WORK
Unit test Runner .exe
My Code
My unit test code
Unit Test Common Lib
Test Results
Code Coverage
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7. TEST DRIVEN DEVELOPMENT
1. Create a falling test
 Red
2. Make the test pass
Green
3. Refactor
 Improve the internal
implementation without changing
the external contract or behavior
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8. THE TESTS ARE THE SPECS
*.doc files can’t prove
software works !
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9. LIMITATION
• 100 % code coverage impossible to reach
• Impossible to catch all errors
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10. UNIT TEST OR INTEGRATION TEST ?
Too often we try to write unmaintainable
integration tests
UT
IT
UT
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11. UNIT TEST VS. DATA BASE
• Isolate data access with an interface
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12. UNIT TEST VS. PROVIDERS
Critical for teams using third-parties.
• Unit Test to simulate provider calls
• UnitTest unit to send data to providers
If the provider updates its interface  test
fails
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13. TOOLS
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14. .NET UNIT TESTING FRAMEWORKS
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15. • Visual studio default interface
MS TEST TOOLS
• ReSharper
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16. MOCKING FRAMEWORK: MOQ
• Dynamically implement a interface
• Test
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17. BEST PRACTICES
• New projects have to include unit test
• Legacy code : when a bug is raised, write a UT that
fails, fix the bug and the UT is successful.
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18. MORE TEST FIRST TECHNIQUES
• ATDD - Acceptance test driven development
Test written in a business language with a wiki
• BDD
Behavior Driven Development
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19. CONCLUSION
Everyone must be involved !
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20. REFERENCES
•
http://blog.octo.com/quels-sont-les-types-de-tests-quel%E2%80%99on-utilise-sur-un-projet-agile/
•
http://googletesting.blogspot.fr/
•
http://weblogs.asp.net/garrypilkington/archive/2010/02/21/setting-upioc-with-mvc-quickly.aspx
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21. FIND OUT MORE
• On https://techblog.betclicgroup.com/

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