I read a few TDD books before this one but this was the book that really got me to understand the difference between simply test-first and test-driven developme

I read a few TDD books before this one but this was the book that really got me to understand the difference between simply test-first and test-driven development. The worked example in the first section of the book really illustrates how to using test-driven to evolve the design of the code that you're writing. Previously I'd approached TDD as figuring out how I want the code to work in my head first and then writing a test that would then let me write that code. Having read this book I now write the tests as a description of how I want the code to behave without first giving consideration to how the implementation will work.