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    <p>Ok, I figured out what is going on here and boy is it a doozy.</p> <p>During testing the framework attempts to preserve global state. In the <code>PHPUnit_Framework_TestCase::run()</code> function the current globals are converted into a string of PHP code by <code>PHPUnit_Util_GlobalState::getGlobalsAsString()</code>. I am currently using an autoloading library to take care of requiring appropriate class files. This class was declared in a variable that was in the global scope, causing a serialization of that object to be put into the <code>$GLOBALS</code> array created by <code>getGlobalsAsString()</code>. This serialization, for whatever reason, includes the null byte character <code>\u0000</code>. When you attempt to unserialize this you get an error and is ultimately causing the output to be corrupted as well.</p> <p>I fixed this issue by create a function in my test bootstrap that creates the autoloading object outside of the global scope. Now that the script is no longer attempting to unserialize a null byte the script produces no errors and the test case works as expected. This is a really funky issue, not sure if its an error in my code, PHPUnit's code or an internal error with the <code>serialize</code> function.</p> <hr> <p>Alternatively you can override the <code>run()</code> function in your test case and explicitly set the test case to not preserve global state. This is probably a cleaner solution as you could easily run into other issues with requiring all included files again as is the default behavior.</p> <pre><code>class ManagerTest extends PHPUnit_Framework_TestCase { public function run(PHPUnit_Framework_TestResult $result = null) { $this-&gt;setPreserveGlobalState(false); parent::run($result); } } </code></pre> <p>Global state must be set <em>before</em> the <code>PHPUnit_Framework_TestCase::run()</code> function is invoked. This is likely the only way to reliably set the global state preservation properly.</p>
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