@Test
public void testConstantWithArrowIndividualStrings() {

	// no spaces
	{
		String[] constantFields = { "0->0,1", "1->2" };

		TypeInformation<?> type = new TupleTypeInfo<Tuple3<Integer, Integer, Integer>>(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(0);
		Assert.assertTrue(fs.size() == 2);
		Assert.assertTrue(fs.contains(0));
		Assert.assertTrue(fs.contains(1));

		fs = sp.getForwardedField(1);
		Assert.assertTrue(fs.size() == 1);
		Assert.assertTrue(fs.contains(2));
	}
	
	// with spaces
	{
		String[] constantFields = { "0 -> 0 ,   1 ", " 1     -> 2  " };

		TypeInformation<?> type = new TupleTypeInfo<Tuple3<Integer, Integer, Integer>>(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(0);
		Assert.assertTrue(fs.size() == 2);
		Assert.assertTrue(fs.contains(0));
		Assert.assertTrue(fs.contains(1));

		fs = sp.getForwardedField(1);
		Assert.assertTrue(fs.size() == 1);
		Assert.assertTrue(fs.contains(2));
	}
}