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The Path to Unit Testing

The Path to Unit Testing. Contact Information. Wes McClure wes.mcclure@gmail.com wmcclure@phxwg.com @g0t4. Poll – How do you test?. Manual Testing Automated Testing QA? Deploy and unplug the phone!. Agenda. Before Testing Unit Testing Frameworks Dependencies Legacy Testing

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The Path to Unit Testing

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  1. The Path to Unit Testing

  2. Contact Information • Wes McClure • wes.mcclure@gmail.com • wmcclure@phxwg.com • @g0t4

  3. Poll – How do you test? • Manual Testing • Automated Testing • QA? • Deploy and unplug the phone!

  4. Agenda • Before Testing • Unit Testing Frameworks • Dependencies • Legacy Testing • Good Testing

  5. Before Testing

  6. Scenario • Weather on company portal. • NOAA web service • Input zip code • Get latitude / longitude • Show weather forecast

  7. Where to start? • Build a Prototype? • Console app • Move into web app

  8. Ok Done! • What is done? • Hanselminutes #119 • Tested?

  9. It was tested … manually • How? • Run program • Provide input • Execute action • Subjectively verify output

  10. Problems with Manual • Thrown away • In the noggin • Not documented • Easily forgotten • Documented • Refactorability • Easy paths • 1 bug fixed = 2 new

  11. How can I fix this? • Automate

  12. Unit Testing • Definition (wikipedia) • Is a software verification and validation method in which a programmer tests if individual units of source code are fit for use. A unit is the smallest testable part of an application. … in object-oriented programming, the smallest unit is a class… • Testing the smallest piece

  13. Unit Test Composition • AAA • Arrange (Given) • Act (When) • Assert (Then) • Same as manual template

  14. States • Passing • Failing • Not Run

  15. Questions? Before Testing

  16. Unit Testing Frameworks

  17. Test Discovery • Inheritance • Naming Convetions • Attributes

  18. NUnit Test Discovery • Basic Attributes • TestFixture • Test • Ignore • Category

  19. Test Execution • Exectuion • Selection • Run • Results (State) • Types • Console • GUI • IDE Integrated

  20. NUnit Test Execution • Runners • Console • GUI • MiniGUI • IDE Integrated • TestDriven.Net • R# Test Runner • Gallio

  21. Assertions • Classic • Fluent “Fluent is the new xml”

  22. NUnit Assertion Syntax • Classic Assertions • Fluent Constraints • AssertionHelper • Expect • Constraints • Is • Has • Throws

  23. Putting it all together • Hello World Test

  24. More NUnit Attributes

  25. SetUp& TearDown • Per Test • Once for Test Fixture • Once for Namespace • Cautious

  26. Parameterized Tests • TestCase • Result • TestName • Theory • DataPoint • Caution

  27. Attributes to Avoid • Random • Tests should be repeatable! • Sequential • Tests shouldn’t be interdependent! • Repeat • Win the lottery?

  28. Other attributes • Localization • Culture • SetCulture • Labeling • Description • Suite • Property • Parametric • Attributes • Values • ValueSource • Range • Combinatorial • Pairwise • TestCaseSource • Timing (async) • MaxTime • Timeout • Threading • RequiresMTA • RequiresSTA • RequiresThread • Others • Explicit • RequiredAddIn • Suite • ExpectedException • Platform

  29. Questions? Unit Testing Frameworks (with NUnit)

  30. Dependencies another word for "testable" is "decoupled"

  31. Dependencies

  32. Weather Dependencies • Input to SUT • Acted upon

  33. Unit Testing with Dependencies • Unit Testing => Isolated Unit • Stubs • Simulate Dependencies • Return Dummy Data • Mocks • Record Calls

  34. Manual Stubs & Mocks • Roll our own • Cons • Low reuse • Boilerplate • Complex logic

  35. Poll • Who has used an isolation framework?

  36. Isolation Frameworks • Dynamic stubs • Proxies • Setup results • Dynamic mocks • Record calls • Verification syntax • Example

  37. Isolation Frameworks • Rhino.Mocks • TypeMock • Moq • NMock2

  38. Questions?

  39. Legacy Testing

  40. Define Legacy • Old • Untested – Michael Feathers • Missing seams

  41. Why Change Legacy Code? • Fix Bugs • Repeats • Add Features • Integrated • Isolated • Improve Design • 80/20 • Improve Moral

  42. Fixing Bugs • Example

  43. Legacy Testing @martinfowler @ JoshuaKerievsky

  44. Questions? Legacy Testing

  45. Good Unit Tests

  46. But… • Anything can be done but it takes effort to do it well! • Consistency in choices • Best Practices • Try alternatives

  47. Good Unit Tests • From “The Art of Unit Testing” • Readable • Maintainable • Trustworthy • For us and others @RoyOsherove http://www.artofunittesting.com/ http://weblogs.asp.net/ROsherove/

  48. Readability • Naming Convention • Method_Scenario_Expectation • Explicit Variables • Call stubs & mocks as such! • Fluent Assertions • var

  49. Readability • AAA • Physical Separate

  50. Readability • Single Assertion • SRP methods • Transfer? • Credit • Debit • Insufficient funds • Transactional • Success / Failure • Auditing

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