scn = System.currentTimeMillis() + counter++;
swm.setLWMScn(source2, scn);
swm.setHWMScn(source2, scn);
assertEquals(swm.getHWMScn(source2), swm.getLWMScn(source2));
assertEquals(2, swm.sources().size());
scn = System.currentTimeMillis() + counter++;
swm.saveHWMark(source1, scn);
swm.saveHWMark(source2, scn);
assertTrue(swm.getLWMScn(source1) < swm.getHWMScn(source1));