@Test
public void cartesianProduct() {
MutableSet<String> set =
MultiReaderUnifiedSet.newSetWith("1", "2", "3", "4").asReadUntouchable();
LazyIterable<Pair<String, String>> cartesianProduct =
set.cartesianProduct(UnifiedSet.newSetWith("One", "Two"));
Verify.assertIterableSize(set.size() * 2, cartesianProduct);
Assert.assertEquals(
set,
cartesianProduct
.filter(Predicates.attributeEqual(Functions.<String>secondOfPair(), "One"))
.transform(Functions.<String>firstOfPair())
.toSet());
}
