assertEquals("", j.join(ImmutableMultimap.of().entries()));
    assertEquals("", j.join(ImmutableMultimap.of().entries().iterator()));
    assertEquals(":", j.join(ImmutableMultimap.of("", "").entries()));
    assertEquals(":", j.join(ImmutableMultimap.of("", "").entries().iterator()));
    assertEquals("1:a;1:b", j.join(ImmutableMultimap.of("1", "a", "1", "b").entries()));

            append(b, "used", () -> p.getUsed().getBytes()).append(',');
            append(b, "capacity", () -> p.getTotalCapacity().getBytes()).append('}');
            return b.toString();
        }).collect(Collectors.joining(",")));
        buf.append("},");
        final GarbageCollectors gc = jvmStats.getGc();
        buf.append("\"gc\":{");
        buf.append(Arrays.stream(gc.getCollectors()).map(c -> {

                .filter(StringUtil::isNotBlank)
                .distinct()
                .collect(Collectors.joining("\n")));
        body.virtualHosts = stream(entity.getVirtualHosts())
                .get(stream -> stream.filter(StringUtil::isNotBlank).distinct().map(String::trim).collect(Collectors.joining("\n")));
        return body;
    }

                .filter(StringUtil::isNotBlank)
                .distinct()
                .collect(Collectors.joining("\n")));
        body.virtualHosts = stream(entity.getVirtualHosts())
                .get(stream -> stream.filter(StringUtil::isNotBlank).distinct().map(String::trim).collect(Collectors.joining("\n")));
        return body;
    }

        InputStream is = new ByteArrayInputStream(input.getBytes(StandardCharsets.UTF_8));

        InputStreamThread thread = new InputStreamThread(is, StandardCharsets.UTF_8, 5, null);
        thread.start();
        thread.join(1000);

        String output = thread.getOutput();
        assertTrue(output.contains("line1"));
        assertTrue(output.contains("line2"));
        assertTrue(output.contains("line3"));
    }

                return StringUtils.join(newInputs, ",");
            }
            return StringUtils.join(newInputs, ",") + "=>" + StringUtils.join(newOutputs, ",");
        }
        if (Arrays.equals(inputs, outputs)) {
            return StringUtils.join(inputs, ",");
        }
        return StringUtils.join(inputs, ",") + "=>" + StringUtils.join(outputs, ",");
    }

                    .collect(Collectors.joining(","));
            buf.append('[').append(json).append(']');
        } else if (value instanceof List) {
            final String json = ((List<?>) value).stream()
                    .map(s -> "\"" + StringEscapeUtils.escapeJson(s.toString()) + "\"")
                    .collect(Collectors.joining(","));
            buf.append('[').append(json).append(']');

                    value = stream((String[]) value).get(stream -> stream.collect(Collectors.joining("\n")));
                } else if (value instanceof List) {
                    @SuppressWarnings("unchecked")
                    final List<String> list = (List<String>) value;
                    value = list.stream().collect(Collectors.joining("\n"));
                }
            } else if (dateFieldSet.contains(key)) {

        }

        @SuppressWarnings("unchecked")
        final List<String> virtualHostList = (List<String>) dataMap.get(fessConfig.getIndexFieldVirtualHost());
        if (virtualHostList != null && !virtualHostList.isEmpty()) {
            buf.append(";v=");
            buf.append(virtualHostList.stream().sorted().collect(Collectors.joining(",")));
        }

    }

    assertEquals("{" + JOINER.join(map.entrySet()) + "}", map.toString());
    assertEquals("[" + JOINER.join(map.entrySet()) + "]", map.entrySet().toString());
    assertEquals("[" + JOINER.join(map.keySet()) + "]", map.keySet().toString());
    assertEquals("[" + JOINER.join(map.values()) + "]", map.values().toString());