void LineSegmentTest::testRightOf()
 {
     CPPUNIT_ASSERT( s1.rightOf(Point(3,1,0)) );
     CPPUNIT_ASSERT( !s1.leftOf(Point(3,1,0)) );
     CPPUNIT_ASSERT( !s1.rightOf(p1) );
 }
 void LineSegmentTest::testLeftOf()
 {
     CPPUNIT_ASSERT( s1.leftOf(Point(1,3,0)) );
     CPPUNIT_ASSERT( !s3.rightOf(Point(1,3,0)) );
     CPPUNIT_ASSERT( !s1.leftOf(p1) );
 }