PHPUnit_Framework_ExceptionWrapper::__toString PHP Method

    public function __toString()
    {
        $string = PHPUnit_Framework_TestFailure::exceptionToString($this);
        if ($trace = PHPUnit_Util_Filter::getFilteredStacktrace($this)) {
            $string .= "\n" . $trace;
        }
        if ($this->previous) {
            $string .= "\nCaused by\n" . $this->previous;
        }
        return $string;
    }