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    Not quite true... With integration tests its possible to have two components that are both buggy, but their bugs cancel out in the integration test. It doesn't matter much until the end user uses it in a way in which only one of these components is used... Commented Jan 13, 2014 at 15:15
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    Code coverage != tested - aside from bugs cancelling each other out, what about scenarios you've never thought about? Integration testing is fine for happy path testing but I rarely see adequate integration testing when things aren't going well. Commented Jan 13, 2014 at 16:34
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    @Ptolemy I think the rarity of 2 buggy components cancelling each other out is far,far lower than 2 working components interfering with each other. Commented Jan 13, 2014 at 16:37
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    @Michael then you just haven't put enough effort into the testing, I did say it is more difficult to do good integration testing as the tests have to be much more detailed. You can supply bad data in an integration test just as easily as you can in a unit test. Integration testing != happy path. Its about exercising as much code as you can, that's why there are code coverage tools that show you how much of your code has been exercised. Commented Jan 13, 2014 at 16:39
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    @Michael When I use tools like Cucumber or SpecFlow correctly I can create integration tests which also tests exceptions and extreme situations as fast as unit tests. But I agree if one class has to much permutations I prefer writing a unit test for this class. But this will be less often the case than having classes with only a handful paths. Commented Jan 14, 2014 at 10:23