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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
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Introduction to Unit Tests & TDD
2
UNIT TEST IN AN AGILE CONTEXT
Agile XP UT
A unit test confirms functionality of a small unit of functionality or component
in a larger system
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DEFINITION
• Written by developers
• isolate piece of code
• No use of database or external ressources
• Find problems early in dev cycle
4
INITIAL REACTIONS
• Higher quality (less bug)
• Living documentation
• Well-crafted code
• Easier refactoring
• Automatic regression harness
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BENEFITS
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HOW UNIT TEST FRAMEWORKS WORK
My Code
My unit test code
Unit test Runner .exe
Unit Test Common Lib
Test Results
Code Coverage
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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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THE TESTS ARE THE SPECS
*.doc files can’t prove software works !
• 100 % code coverage impossible to reach
• Impossible to catch all errors
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LIMITATION
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UNIT TEST OR INTEGRATION TEST ?
IT UT
UT
Too often we try to write unmaintainable integration tests
• Isolate data access with an interface
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UNIT TEST VS. DATA BASE
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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UNIT TEST VS. PROVIDERS
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TOOLS
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.NET UNIT TESTING FRAMEWORKS
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MS TEST TOOLS • Visual studio default interface
• ReSharper
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MOCKING FRAMEWORK: MOQ
• Test
• Dynamically implement a interface
• 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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BEST PRACTICES
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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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CONCLUSION
Everyone must be involved !
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REFERENCES
• http://blog.octo.com/quels-sont-les-types-de-tests-que-l%E2%80%99on-utilise-sur-un-projet-agile/
• http://googletesting.blogspot.fr/
• http://weblogs.asp.net/garrypilkington/archive/2010/02/21/setting-up-ioc-with-mvc-quickly.aspx
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