Back in 2014 I wrote a blog post listing three mistakes often made by folks who are new to test-driven development (TDD). The three mistakes I identified are:

Starting with error cases or null cases.

Writing tests for invented requirements.

Writing a dozen or more lines of code to get to GREEN.

It was a very long post, so I’ve taken the three parts and expanded each into its own article, also incorporating the comments I received in 2014. This is part 3, and will deal with taking a step that’s too b...