@Test
public void testOnlyOne() {
List<Integer> ints = IntStreamEx.rangeClosed(1, 100).boxed().toList();
checkShortCircuitCollector("One", Optional.empty(), 2, ints::stream, MoreCollectors.onlyOne());
checkShortCircuitCollector(
"FilterSeveral",
Optional.empty(),
2,
() -> ints.stream().filter(x -> x % 20 == 0),
MoreCollectors.onlyOne());
checkShortCircuitCollector(
"FilterSeveral2",
Optional.empty(),
40,
ints::stream,
MoreCollectors.filtering(x -> x % 20 == 0, MoreCollectors.onlyOne()));
checkShortCircuitCollector(
"FilterOne",
Optional.of(60),
1,
() -> ints.stream().filter(x -> x % 60 == 0),
MoreCollectors.onlyOne());
checkShortCircuitCollector(
"FilterNone",
Optional.empty(),
0,
() -> ints.stream().filter(x -> x % 110 == 0),
MoreCollectors.onlyOne());
}
