// string1Declaration is bound to pattern 3
this.node = new ExistsNode( 15,
new MockTupleSource( 5 ),
new MockObjectSource( 8 ),
new DefaultBetaConstraints( new BetaNodeFieldConstraint[]{this.constraint},
configuration ) );
this.sink = new MockTupleSink();
this.node.addTupleSink( this.sink );