@Test
public void getOperatorShouldReturnTheJoiningOperatorToTheOnlyFunction() {

	final eu.stratosphere.api.common.operators.Operator contract =
		new OperatorWithOneFunction().getOperator(LAYOUT);
	assertEquals(MapOperatorBase.class, contract.getClass());
	assertEquals(OperatorWithOneFunction.Implementation.class, contract.getUserCodeWrapper().getUserCodeClass());
}