PHPUnit_Framework_TestFailure::toString PHP Method

    public function toString()
    {
        return sprintf('%s: %s', $this->testName, $this->thrownException->getMessage());
    }

 /**
  * @covers PHPUnit_Framework_TestFailure::toString
  */
 public function testToString()
 {
     $test = new self(__FUNCTION__);
     $exception = new PHPUnit_Framework_Exception('message');
     $failure = new PHPUnit_Framework_TestFailure($test, $exception);
     $this->assertEquals(__METHOD__ . ': message', $failure->toString());
 }