@Test public void intersect() { MutableSet<String> set = MultiReaderUnifiedSet.newSetWith("1", "2", "3", "4").asReadUntouchable(); MutableSet<String> intersect = set.intersect(UnifiedSet.newSetWith("a", "b", "c", "1")); Verify.assertSize(1, intersect); Assert.assertEquals(UnifiedSet.newSetWith("1"), intersect); Verify.assertEmpty(set.intersect(UnifiedSet.newSetWith("not present"))); }