public void testToImmutableBiMap_exceptionOnDuplicateKey() {
Collector<Entry<String, Integer>, ?, ImmutableBiMap<String, Integer>> collector =
ImmutableBiMap.toImmutableBiMap(Entry::getKey, Entry::getValue);
try {
Stream.of(mapEntry("one", 1), mapEntry("one", 11)).collect(collector);
fail("Expected IllegalArgumentException");
} catch (IllegalArgumentException expected) {
}
}
public void testToImmutableBiMap() {
Collector<Entry<String, Integer>, ?, ImmutableBiMap<String, Integer>> collector =
ImmutableBiMap.toImmutableBiMap(Entry::getKey, Entry::getValue);
Equivalence<ImmutableBiMap<String, Integer>> equivalence =
Equivalence.equals()
.<Entry<String, Integer>>pairwise()
.onResultOf(ImmutableBiMap::entrySet);
CollectorTester.of(collector, equivalence)
.expectCollects(
ImmutableBiMap.of("one", 1, "two", 2, "three", 3),
mapEntry("one", 1),
mapEntry("two", 2),
mapEntry("three", 3));
}