Meaning: if I break the feature, will I know about it from a test failure? Basically, you put the customer first. Make sure your features are tested such that

Meaning: if I break the feature, will I know about it from a test failure? Basically, you put the customer first. Make sure your features are tested such that they can't fail without a failing test before writing lower-level tests. This is also the approach advocated by the popular book Growing Object-Oriented Software Guided by Tests.