assertTrue("add(null) should return true", collection.add(null));
    expectAdded((E) null);
  }

  @CollectionFeature.Require(value = SUPPORTS_ADD, absent = ALLOWS_NULL_VALUES)
  public void testAdd_nullUnsupported() {
    assertThrows(NullPointerException.class, () -> collection.add(null));
    expectUnchanged();
    expectNullMissingWhenNullUnsupported("Should not contain null after unsupported add(null)");
  }

     */
    @Nonnull
    ProjectBuilderResult build(ProjectBuilderRequest request) throws ProjectBuilderException;

    /**
     * Creates a {@link org.apache.maven.api.Project} from a POM file.
     *
     * @param session the {@link Session}, must not be {@code null}
     * @param source The {@link Source}, must not be {@code null}

        int exitCode = new MavenUpCling().run(args, null, null, null, false);
        System.exit(exitCode);
    }

    /**
     * ClassWorld Launcher "enhanced" entry point: returning exitCode and accepts Class World.
     */
    public static int main(String[] args, ClassWorld world) throws IOException {
        return new MavenUpCling(world).run(args, null, null, null, false);
    }

    /**

        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() {

      when {
        response != null && response.code != 101 -> response.body.string()
        else -> null
      }

    override fun toString(): String =
      when (response) {
        null -> "Failure[$t]"
        else -> "Failure[$response]"
      }
  }

  internal data class Message(
    val bytes: ByteString? = null,
    val string: String? = null,
  )

  internal data class Ping(

                    .thenReturn(null);

            // Perform the renewal
            boolean renewed = wrapper.renewCredentials("locationHint", null);

            // Verify that NtlmAuthenticator was used but credentials were not updated
            assertFalse(renewed, "renewCredentials should return false when NtlmAuthenticator returns null");

        if (reporting != null) {
            reporting.setOutputDirectory(alignToBaseDirectory(reporting.getOutputDirectory(), basedir));
        }
    }

    @Override
    public String alignToBaseDirectory(String path, File basedir) {
        if (basedir == null) {
            return path;
        }

        if (path == null) {
            return null;
        }

        localRepositoryPath = (localRepository != null) ? new File(localRepository) : null;

        return this;
    }

    @Override
    public MavenExecutionRequest setSystemProperties(Properties properties) {
        if (properties != null) {
            this.systemProperties = SystemProperties.copyProperties(properties);
        } else {
            this.systemProperties = null;
        }

        return this;

                }));
    expectReplacement(entry(getKeyForNullValue(), v3()));
  }

  @MapFeature.Require({SUPPORTS_PUT, ALLOWS_NULL_KEYS})
  public void testMergeAbsentNullKey() {
    assertEquals(
        "Map.merge(null, value, function) should return value",
        v3(),
        getMap()
            .merge(
                null,
                v3(),

        doUpdate(entity, null);
    }

    public void insertOrUpdate(ElevateWordToLabel entity) {
        doInsertOrUpdate(entity, null, null);
    }

    public void insertOrUpdate(ElevateWordToLabel entity, RequestOptionCall<IndexRequestBuilder> opLambda) {
        entity.asDocMeta().indexOption(opLambda);
        doInsertOrUpdate(entity, null, null);
    }