swm.saveHWMark(source1, scn);
swm.saveHWMark(source2, scn);
assertTrue(swm.getLWMScn(source1) < swm.getHWMScn(source1));
assertTrue(swm.getLWMScn(source2) < swm.getHWMScn(source2));
swm.syncWaterMarks();
assertEquals(swm.getHWMScn(source1), swm.getLWMScn(source1));
assertEquals(swm.getHWMScn(source2), swm.getLWMScn(source2));
assertTrue(swm.getFile().exists());
assertTrue(swm.getFileOriginal().exists());