TestInput<Ex1> mst = tester.input(Ex1.class, "mst", DataSize.TINY);
TestInput<Ex1> in1 = tester.input(Ex1.class, "in1");
TestInput<Ex1> in2 = tester.input(Ex1.class, "in2");
TestOutput<ExJoined> out = tester.output(ExJoined.class, "out");
Ex1 dMst = new Ex1();
dMst.setSid(1);
dMst.setValue(10);
mst.add(dMst);
Ex1 dIn1 = new Ex1();
dIn1.setSid(2);
dIn1.setValue(10);
in1.add(dIn1);
Ex1 dIn2 = new Ex1();
dIn2.setSid(3);
dIn2.setValue(10);
in2.add(dIn2);
final In<Ex1> pMst = mst.flow();
final In<Ex1> pIn1 = in1.flow();
final In<Ex1> pIn2 = in2.flow();