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Test Your Legacy Rails Code

About the Talk

November 4, 2011 9:45 AM

Kansas City, MO

Kansas City, MO

Everybody wants to do test-driven development, but switching to TDD or BDD on an existing project that doesn’t have tests presents special challenges. Often, the current code is a tangled mess of dependencies that defeats the very concept of unit testing. Worse, if somebody has attempted TDD in the past, you might have a test suite that needs to be fixed before any new tests can be written.

Don’t give up. Adding test-coverage and TDD to your application will make it easier.

This session will describe techniques that you can use to bootstrap a test-driven process into your project. You’ll see how to use “black-box” techniques that don’t depend on the structure of the code and “white-box” techniques that interact with the code more directly.

Topics covered will include:

  • Using Cucumber to perform black-box testing.
  • Using RSpec to perform white-box testing.
  • Using mocks to isolate legacy code.
  • Safer refactoring by finding seams, or ways to update code without changing existing behavior
  • Measuring test coverage and other useful metrics

At the end of this session you will be ready to attack the most monstrous of code bases with TDD.

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