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I'm trying to mock a filesystem operation (well actually a read from php://input) with vfsStream but the lack of decent documentation and examples is really hampering me. The relevant code from the class I'm testing is as follows: class RequestBody implements iface\request\RequestBody { const REQ_PATH = 'php://input', protected $requestHandle = false; /** * Obtain a handle to the request body * * @return resource a file pointer resource on success, or <b>FALSE</b> on error. */ protected function getHandle () { if (empty ($this -> requestHandle)) { $this -> requestHandle = fopen (static::REQ_PATH, 'rb'); } return $this -> requestHandle; } } The setup I'm using in my PHPUnit test is as follows: protected function configureMock () { $mock = $this -> getMockBuilder ('\gordian\reefknot\http\request\RequestBody'); $mock -> setConstructorArgs (array ($this -> getMock ('\gordian\reefknot\http\iface\Request'))) -> setMethods (array ('getHandle')); return $mock; } /** * Sets up the fixture, for example, opens a network connection. * This method is called before a test is executed. */ protected function setUp () { \vfsStreamWrapper::register(); \vfsStream::setup ('testReqBody'); $mock = $this -> configureMock (); $this -> object = $mock -> getMock (); $this -> object -> expects ($this -> any ()) -> method ('getHandle') -> will ($this -> returnCallback (function () { return fopen ('vfs://testReqBody/data', 'rb'); })); } In an actual test (which calls a method which indirectly triggers getHandle()) I try to set up the VFS and run an assertion as follows: public function t

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