> Testing does tend to have a negative impact on API design. Not all test has a negative impact. IMO, certain forms of testing have a positive impact because i

> Testing does tend to have a negative impact on API design. Not all test has a negative impact. IMO, certain forms of testing have a positive impact because it provides feedback and allows fearless refactoring. White Box testing with many mocks and other affordances has a negative impact. Black box testing does not require many affordances.