assertEquals("FF", Hexdump.toHexString(255, 2));
        assertEquals("1234", Hexdump.toHexString(0x1234, 4));
    }

    @Test
    @DisplayName("Should convert long to hex string with padding")
    void testLongToHexString() {
        // Test various long values
        assertEquals("0000000000000000", Hexdump.toHexString(0L, 16));
        assertEquals("00000000000000FF", Hexdump.toHexString(255L, 16));

    //                                                                        ============

    private static OptionalEntity<RelatedContent> getEntity(final CreateForm form, final String username, final long currentTime) {
        switch (form.crudMode) {
        case CrudMode.CREATE:
            return OptionalEntity.of(new RelatedContent()).map(entity -> {
                entity.setCreatedBy(username);

        // Verify that exception is serializable
        assertTrue(exception instanceof java.io.Serializable);
    }

    public void test_longMessage() {
        // Setup - test with a very long message
        final StringBuilder longMessageBuilder = new StringBuilder();
        for (int i = 0; i < 1000; i++) {
            longMessageBuilder.append("Query segment ").append(i).append("; ");
        }

    clientListener.assertOpen()

    // Send messages until the client's outgoing buffer overflows!
    val message: ByteString = ByteString.of(*ByteArray(1024 * 1024))
    var messageCount: Long = 0
    while (true) {
      val success = webSocket.send(message)
      if (!success) break
      messageCount++
      val queueSize = webSocket.queueSize()

     * interval, 24 hours starting when the certificate is created.
     */
    fun validityInterval(
      notBefore: Long,
      notAfter: Long,
    ) = apply {
      require(notBefore <= notAfter && notBefore == -1L == (notAfter == -1L)) {
        "invalid interval: $notBefore..$notAfter"
      }
      this.notBefore = notBefore

      "path": {
        "type": "keyword"
      },
      "generator": {
        "type": "keyword"
      },
      "target": {
        "type": "keyword"
      },
      "createdTime": {
        "type": "long"
      },
      "createdBy": {
        "type": "keyword"
      }
    }

        }
    }

    // Test implementation of FessUser interface
    private static class TestFessUser implements FessUser {
        private static final long serialVersionUID = 1L;
        private final String name;
        private final String[] roleNames;
        private final String[] groupNames;
        private final String[] permissions;

        assertEquals("", exception.getMessage());
        assertNull(exception.getCause());
    }

    public void test_constructorWithString_longMessage() {
        // Test with a long message
        String message = "This is a very long error message that describes in detail why the job was not found. "
                + "The job with identifier XYZ123 was expected to be in the system but could not be located "

        if (format.contains("epoch_millis")) {
            return Long.toString(date.getTime());
        } else if (format.contains("date_optional_time")) {
            final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
            sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
            return sdf.format(date);
        } else {
            return Long.toString(date.getTime());
        }
    }

        if (format.contains("epoch_millis")) {
            return Long.toString(date.getTime());
        } else if (format.contains("date_optional_time")) {
            final SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
            sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
            return sdf.format(date);
        } else {
            return Long.toString(date.getTime());
        }
    }