@Test
public void testGetInput() {

	final Operator<?> input1 = new OpImpl(0);
	final Operator<?> input2 = new OpImpl(1);
	final Operator<?> fixture = new OpImpl(0).withInputs(input1, input2);
	assertSame(input1.getOutput(0), fixture.getInput(0));
	assertSame(input2.getOutput(0), fixture.getInput(1));
}