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Sebastian Bergmann's Blog:
Global Variables and PHPUnit
June 17, 2008 @ 08:49:19

Sebastian Bergmann has a new post today about a feature of the PHPUnit unit testing tool that has the possibility of breaking when objects are introduced - backing up the globals.

It is hard to test code that uses singletons. The same is true for code that uses global variables. Typically, the code you want to test is coupled strongly with a global variable and you cannot control its creation. An additional problem is the fact that one test's change to a global variable might break another test.

You can disable the backup option if you'd like by setting the $backupGlobals option in your test to false. This lets PHPUnit know that you want to leave the globals (and superglobals) alone during the run.

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