@Test
public void testCommonPrefix() {
checkCollectorEmpty("prefix", "", MoreCollectors.commonPrefix());
List<String> input = Arrays.asList("abcdef", "abcdefg", "abcdfgfg", "abcefgh", "abcdfg");
checkShortCircuitCollector(
"prefix", "abc", input.size(), input::stream, MoreCollectors.commonPrefix());
List<CharSequence> inputSeq =
Arrays.asList(
new StringBuffer("abcdef"),
"abcdefg",
"abcdfgfg",
"abcefgh",
new StringBuilder("abcdfg"));
checkShortCircuitCollector(
"prefix", "abc", inputSeq.size(), inputSeq::stream, MoreCollectors.commonPrefix());
List<String> input2 = Arrays.asList("abcdef", "abcdefg", "dabcdfgfg", "abcefgh", "abcdfg");
checkShortCircuitCollector("prefix", "", 3, input2::stream, MoreCollectors.commonPrefix());
List<String> inputHalf = new ArrayList<>();
inputHalf.addAll(Collections.nCopies(1000, "abc"));
inputHalf.addAll(Collections.nCopies(1000, "def"));
checkShortCircuitCollector(
"prefix", "", 1001, inputHalf::stream, MoreCollectors.commonPrefix());
List<String> inputSurrogate =
Arrays.asList("abc\ud801\udc2f", "abc\ud801\udc2f", "abc\ud801\udc14");
checkShortCircuitCollector(
"prefix",
"abc",
inputSurrogate.size(),
inputSurrogate::stream,
MoreCollectors.commonPrefix());
List<String> inputSurrogateBad = Arrays.asList("abc\ud801x", "abc\ud801y", "abc\ud801z");
checkShortCircuitCollector(
"prefix",
"abc\ud801",
inputSurrogateBad.size(),
inputSurrogateBad::stream,
MoreCollectors.commonPrefix());
List<String> inputSurrogateMix =
Arrays.asList("abc\ud801\udc2f", "abc\ud801x", "abc\ud801\udc14");
checkShortCircuitCollector(
"prefix",
"abc",
inputSurrogateMix.size(),
inputSurrogateMix::stream,
MoreCollectors.commonPrefix());
}
