Fakes the processing of the invocation $invocation by returning a specific value.
PHPUnit_Framework_MockObject_Invocation $invocation: The invocation which was mocked and matched by the current method and argument matchers.
mixed
Overrides PHPUnit_Framework_MockObject_Stub::invoke
public function invoke(PHPUnit_Framework_MockObject_Invocation $invocation) {
return call_user_func_array($this->callback, $invocation->parameters);
}