Unit Testing with items that need to send headers

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Well, your session manager is basically broken by design. To be able to test something, it must be possible to isolate it from side effects. Unfortunately, PHP is designed in such a way, that it encourages liberal use of global state (echo, header, exit, session_start etc. etc.).

The best thing you can do, is to isolate the side-effects in a component, that can be swapped at runtime. That way, your tests can use mocked objects, while the live code uses adapters, that have real side-effects. You’ll find that this doesn’t play well with singletons, which I presume you’re using. So you’ll have to use some other mechanism for getting shared objects distributed to your code. You can start with a static registry, but there are even better solutions if you don’t mind a bit of learning.

If you can’t do that, you always have the option of writing integration-tests. Eg. use the PHPUnit’s equivalent of WebTestCase.

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