>The argument I get against this is that when a higher level test fails, it's harder to locate the lines of code that broke the test unlike when you have lots o

>The argument I get against this is that when a higher level test fails, it's harder to locate the lines of code that broke the test unlike when you have lots of unit tests. I don't find this convincing though. This is a valid observation but the problem clears up when you start integrating better debugging tools into your testing infrastructure: having the ability to intercept and inspect API calls made by your app, launch a debugger in in the middle of the test, etc. It is also minimized by writing the test at the same time (or just before) the code that makes it pass.