prdc10-tdd-patterns
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The document is a presentation by Amir Barylko on test-driven development (TDD) patterns for .NET developers. It introduces Amir and discusses why TDD is useful. It then covers common tools, patterns, and techniques used for TDD with .NET such as dependency injection, mock objects, and database setup. The presentation aims to provide best practices for implementing TDD in .NET projects.
![TEST WITH PARAMETERS
[Row(1)]
• Avoid duplication and [Row(2)]
repetition void Method(int arg)
[Row(typeof(...))]
• Generic Parameters void Method<T>(...)
• Parameters Factories [Factory(...)]
void Method(string arg)
• Random strings void Method([Random]...)
• Random numbers void Method([Random]...,
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Amir Barylko - TDD Patterns MavenThought Inc.](https://image.slidesharecdn.com/tdd-patterns-120524122913-phpapp01/85/prdc10-tdd-patterns-12-320.jpg)
prdc10-tdd-patterns
- 2. AMIR BARYLKO TDD PATTERNS FOR .NET DEVELOPERS PRAIRIE DEV CON REGINA 2010 Amir Barylko - TDD Patterns MavenThought Inc.
- 3. WHO AM I? • Architect • Developer • Mentor • Great cook • The one who’s entertaining you for the next hour! Amir Barylko - TDD Patterns MavenThought Inc.
- 4. WHY TDD? • Test first approach • Quality driven • Easy to refactor • Regression tests as byproduct • Increase developer’s confidence Amir Barylko - TDD Patterns MavenThought Inc.
- 5. SETUP Amir Barylko - TDD Patterns MavenThought Inc.
- 6. TOOLS • Testing framework: NUnit, MbUnit, MSpec, MavenThought Testing • Mocking framework: Rhino Mocks, Moq, TypeMock • Test Automation: Scripts that can run the test from the developer computer. • CI server: Unit test should be run after each commit. • Reports and Notifications: The team should realize right away that the tests are broken. Amir Barylko - TDD Patterns MavenThought Inc.
- 7. AUTO MOCKING • Automatic dependency creation for SUT • Dictionary of dependencies • Faster setup of tests • Build your own: StructureMap • Or use MavenThought Testing Amir Barylko - TDD Patterns MavenThought Inc.
- 8. PATTERNS Amir Barylko - TDD Patterns MavenThought Inc.
- 9. ONE FEATURE PER TEST • Easy to approach Given That (arrange) • Easy to understand When I Run • Easy to maintain (act) • Enforce Given, When, Then Then it should ... (assert) Amir Barylko - TDD Patterns MavenThought Inc.
- 10. STATE VERIFICATION • Care about the end state var m = new Library... • Does not validate SUT transitions Run Test • Verifythe state agains the m.Count.Should(...) expected value Amir Barylko - TDD Patterns MavenThought Inc.
- 11. BEHAVIOUR VERIFICATION • Checking the expected var m = Mock<...> behaviour happened • Uses mock objects m.Stub(...) • The behaviour is specified for each mock object Run Test • The expected methods m.AssertWasCalled(...) should be called Amir Barylko - TDD Patterns MavenThought Inc.
- 12. TEST WITH PARAMETERS [Row(1)] • Avoid duplication and [Row(2)] repetition void Method(int arg) [Row(typeof(...))] • Generic Parameters void Method<T>(...) • Parameters Factories [Factory(...)] void Method(string arg) • Random strings void Method([Random]...) • Random numbers void Method([Random]..., [Factory]...) Amir Barylko - TDD Patterns MavenThought Inc.
- 13. DEPENDENCY INJECTION • Remove hardcoded Initialize dependency dependencies • Introduces dependency in Stub dependency with the constructor / setter mock • Easy to test and maintain Assert the mock is returned •S OLID Amir Barylko - TDD Patterns MavenThought Inc.
- 14. DEPENDENCY LOOKUP • Remove hardcoded Initialize service dependencies locator • Introduces a factory or Stub to return a mock service locator • Easy to test and maintain Assert the mock is returned •S OLID Amir Barylko - TDD Patterns MavenThought Inc.
- 15. DATABASE SETUP • Base class to setup the Create Database database • The test always works with a Populate clean database • Can be configured to Store populate data if needed Retrieve and Assert Amir Barylko - TDD Patterns MavenThought Inc.
- 16. QUESTIONS? Amir Barylko - TDD Patterns MavenThought Inc.
- 17. RESOURCES • Contact me: amir@barylko.com, @abarylko • Download: http://www.orhtocoders.com/prairiedevcon • Books: The rSpec book, xUnit Patterns. Amir Barylko - TDD Patterns MavenThought Inc.
- 18. RESOURCES II • NUnit: http://www.nunit.org • Gallio & MbUnit: http://www.gallio.org • MavenThought Testing: http://maventcommons.codeplex.com • Rhino Mocks: http://www.ayende.com • StructureMap: http://structuremap.sourcefore.com • TeamCity: http://www.jetbrains.com Amir Barylko - TDD Patterns MavenThought Inc.