public function testCompareRhsAndLhsBothNegative()
 {
     $x = new \MyOddWeb\BigNumber(-5);
     $y = new \MyOddWeb\BigNumber(-3);
     // we are smaller.
     $this->assertSame(-1, $x->Compare($y));
     $x = new \MyOddWeb\BigNumber(-3);
     $y = new \MyOddWeb\BigNumber(-5);
     // we are greater.
     $this->assertSame(1, $x->Compare($y));
 }