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Visualizing TDD

I saw an angel in the block of marble and I just chiseled ’til I set him free. – Michelangelo My last post, about what my colleague Yuval Mazor coined “post-tdd-ism”, came under some criticism. It was mostly triggered, understandably, by the last sentence of...

Test-Driven and Test-First Development

Students and clients approach me too many times asking for my take on whether unit tests should be written before or after the code they test. They often tell me that they’ve read or been told that if they write the unit test “after”, it can’t be considered TDD –...

Every Test Is Isolated

If you’ve been told that the difference between unit tests and integration tests is that unit tests are isolated, you’ve been misinformed. That is, unit tests are isolated, but that’s not the difference. You might be asking yourself what the real difference is, but...