encodeSFixed64() public method

public encodeSFixed64 ( $sFixed64 )
 /**
  * @expectedException RuntimeException
  * @expectedExceptionMessage Negative integers are only supported with GMP or BC (64bit) intextensions.
  */
 public function testEncodeEncodeSFixed64Exception()
 {
     $encoder = new InvalidNegativeEncoder();
     $encoder->encodeSFixed64(-1);
 }