@Throws(EOFException::class)
private fun Buffer.readChallengeHeader(result: MutableList<Challenge>) {
  var peek: String? = null

  while (true) {
    // Read a scheme name for this challenge if we don't have one already.
    if (peek == null) {
      skipCommasAndWhitespace()
      peek = readToken()
      if (peek == null) return
    }

    val schemeName = peek

    // Read a token68, a sequence of parameters, or nothing.

        this.isEstablished = false;
        this.sealClientHandle = null;
        this.sealServerHandle = null;
        this.sealClientKey = null;
        this.sealServerKey = null;
        this.masterKey = null;
        this.signKey = null;
        this.verifyKey = null;
        this.type1Bytes = null;
    }

        assertEquals("first,null,third", result);
    }

    @Test
    @DisplayName("Should handle all null elements")
    void testJoinWithAllNullElements() {
        String result = StringUtil.join(",", null, null, null);
        assertEquals("null,null,null", result);
    }

    @Test
    @DisplayName("Should handle empty string elements")
    void testJoinWithEmptyStringElements() {

                    if (cresp != null && cresp.isReceived()) {
                        return (T) cresp;
                    }
                    if (chain != null) {
                        return this.transport.send(chain, null, params);
                    }
                    return null;
                }
            }
        }

    expected[getNullLocation()] = entry(null, v3());
    expectContents(expected);
  }

  @MapFeature.Require({SUPPORTS_PUT, ALLOWS_NULL_KEYS})
  public void testComputeIfPresent_nullKeySupportedAbsent() {
    assertNull(
        "computeIfPresent(null, function) should return null",
        getMap()
            .computeIfPresent(
                null,
                (k, v) -> {

        // Assert - message and cause are null
        assertNull(ex.getMessage(), "Default constructor should have null message");
        assertNull(ex.getCause(), "Default constructor should have null cause");

        // Assert - toString shows class name when message is null
        assertEquals(SMBProtocolDowngradeException.class.getName(), ex.toString());

     * @param includes the patterns of files to include, or null/empty for including all files
     * @param excludes the patterns of files to exclude, or null/empty for no exclusion
     * @param useDefaultExcludes whether to augment excludes with default SCM exclusion patterns
     * @return a PathMatcher that can be used to test if paths should be included
     * @throws NullPointerException if baseDirectory is null
     */
    @Nonnull

    if (expectedSequenceNumber != ANY_SEQUENCE_NUMBER &&
      (entry == null || entry.sequenceNumber != expectedSequenceNumber)
    ) {
      return null // Snapshot is stale.
    }

    if (entry?.currentEditor != null) {
      return null // Another edit is in progress.
    }

    if (entry != null && entry.lockingSourceCount != 0) {
      return null // We can't write this file because a reader is still reading it.
    }

        assertEquals(1, tags.length);
        assertEquals("PrunedTag [tag=a, id=null, css=null, attrName=null, attrValue=null]", tags[0].toString());

        tags = PrunedTag.parse("a#test");
        assertEquals(1, tags.length);
        assertEquals("PrunedTag [tag=a, id=test, css=null, attrName=null, attrValue=null]", tags[0].toString());

        tags = PrunedTag.parse("a.test");
        assertEquals(1, tags.length);

     * If the input array is {@code null}, an empty stream is returned.
     *
     * @param <T> The type of elements in the stream.
     * @param values The elements to be included in the stream. Can be {@code null}.
     * @return A {@link StreamOf} instance containing the provided values, or an empty stream if {@code values} is {@code null}.
     */
    @SafeVarargs