@Test
public void testConstantWithArrowIndividualStringsSpaces() {

	String[] constantFields = { "  1-> 1 , 2", "2 ->3" };
	TypeInformation<?> type = new TupleTypeInfo<Tuple4<Integer, Integer, Integer, Integer>>(BasicTypeInfo.INT_TYPE_INFO,
			BasicTypeInfo.INT_TYPE_INFO, BasicTypeInfo.INT_TYPE_INFO, BasicTypeInfo.INT_TYPE_INFO);
	SingleInputSemanticProperties sp = SemanticPropUtil.getSemanticPropsSingleFromString(constantFields, null, null, type, type);
	FieldSet fs = sp.getForwardedField(1);
	Assert.assertTrue(fs.size() == 2);
	Assert.assertTrue(fs.contains(1));
	Assert.assertTrue(fs.contains(2));
	fs = sp.getForwardedField(2);
	Assert.assertTrue(fs.size() == 1);
	Assert.assertTrue(fs.contains(3));
}