import java.io.FilterWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import org.jspecify.annotations.NullUnmarked;

/**
 * A char sink for testing that has configurable behavior.
 *
 * @author Colin Decker
 */
@NullUnmarked
public class TestCharSink extends CharSink implements TestStreamSupplier {

  private final TestByteSink byteSink;

  public TestCharSink(TestOption... options) {

    void testGetSubjectLoginFailuresCacheAndRefresh(SubjectVariant variant) throws Exception {
        JAASAuthenticator auth = buildAuthenticator(variant);

        // First call attempts a JAAS login; behavior depends on JAAS configuration
        Subject first = auth.getSubject();

        // Second call should return cached value (same as first)
        Subject second = auth.getSubject();

	<component name="invokerAssistant" class="org.codelibs.fess.opensearch.common.ImplementedInvokerAssistant"/>
	<component name="behaviorCommandInvoker" class="org.dbflute.bhv.core.BehaviorCommandInvoker"/>

	<!-- The components of Behavior. -->
	<component name="userBhv" class="org.codelibs.fess.opensearch.user.exbhv.UserBhv"/>
	<component name="roleBhv" class="org.codelibs.fess.opensearch.user.exbhv.RoleBhv"/>

 * override one or more methods to modify the behavior of the backing sorted set as desired per the
 * <a href="http://en.wikipedia.org/wiki/Decorator_pattern">decorator pattern</a>.
 *
 * <p><b>Warning:</b> The methods of {@code ForwardingSortedSet} forward <i>indiscriminately</i> to
 * the methods of the delegate. For example, overriding {@link #add} alone <i>will not</i> change

 * between time measurements.
 * <p>
 * This implementation is singleton-based and always uses UTC timezone. The clock
 * cannot be adjusted to different timezones to maintain consistent monotonic behavior.
 * Users needing local time representation should convert the result of {@link #instant()}
 * to their desired timezone:
 * <pre>{@code
 * Instant now = MonotonicClock.now();

      render: java
    validations:
      required: true

  - type: textarea
    attributes:
      label: Expected Behavior
      description: What did you expect to happen?
    validations:
      required: true

  - type: textarea
    attributes:
      label: Actual Behavior
      description: What actually happened?
    validations:
      required: true

  - type: dropdown
    attributes:

        // Close the stream
        outputStream.close();

        // When & Then - after close, tmp is null so write(int) will throw NullPointerException
        // This is the actual behavior of the implementation
        assertThrows(NullPointerException.class, () -> outputStream.write(65));
    }

    @Test
    void testWriteNullArray() throws CIFSException {
        // Given

        NameQueryRequest request = spy(new NameQueryRequest(mockConfig, mockName));
        byte[] dst = new byte[100];
        int dstIndex = 0;

        // Mock the superclass method to control its behavior
        doReturn(10).when((NameServicePacket) request).writeQuestionSectionWireFormat(any(byte[].class), anyInt());

        int result = request.writeBodyWireFormat(dst, dstIndex);

**Key Test Areas**:
- `validateInputStream()` method behavior
- Exception types and messages
- Stream consumption (should not consume)
- Consistency across multiple calls

**Test Count**: 11 tests

**Key Scenarios**:
- ✅ Validates non-null streams
- ✅ Throws CrawlerSystemException for null
- ✅ Called during getText execution
- ✅ Does not consume or modify stream
- ✅ Consistent behavior across multiple calls

   * endpoints are unordered and the graph is directed; it simply returns {@code false}. This is for
   * consistency with the behavior of {@link Collection#contains(Object)} (which does not generally
   * throw if the object cannot be present in the collection), and the desire to have this method's
   * behavior be compatible with {@code edges().contains(endpoints)}.
   *
   * @since 27.1
   */
  @Override