@Test
public void testPutValues()
{

    SetMap<String, Integer> map = new SetMap<>();
    map.putValues( "a", Sets.newHashSet( 1, 2, 3 ) );
    map.putValues( "a", Sets.newHashSet( 3, 4 ) );
    map.putValues( "b", Sets.newHashSet( 5, 6 ) );
    
    assertEquals( Sets.newHashSet( 1, 2, 3, 4 ), map.get( "a" ) );
    assertEquals( Sets.newHashSet( 5, 6 ), map.get( "b" ) );
}