Should it be “Arrange-Assert-Act-Assert”?

Question

Regarding the classic test pattern of Arrange-Act-Assert, I frequently find myself adding a counter-assertion that precedes Act. This way I know that the passing assertion

Answer 1

I've already read about this technique - possibly from you btw - but I do not use it; mostly because I'm used to the triple A form for my unit tests.

Now, I'm getting curious, and have some questions: how do you write your test, do you cause this assertion to fail, following a red-green-red-green-refactor cycle, or do you add it afterwards ?

Do you fail sometimes, perhaps after you refactor the code ? What does this tell you ? Perhaps you could share an example where it helped. Thanks.