// This test verifies that attempting to open a connection for an unsupported protocol
        // results in an IOException, as no default handler should be found.
        assertThrows(IOException.class, () -> {
            handler.openConnection(new URL("unknownprotocol://somehost/path"));
        }, "Should throw IOException for an unknown protocol.");
    }

    @Test
    void testSetURLStreamHandlerFactory_SuccessFirstTime() {

 * governing permissions and limitations under the License.
 */
package org.codelibs.core.exception;

import static org.codelibs.core.collection.ArrayUtil.asArray;

import java.sql.SQLException;

import org.codelibs.core.message.MessageFormatter;

/**
 * Exception that wraps {@link SQLException}.
 *
 * @author higa
 * @author manhole
 */

        IOException error = new IOException("Test error");

        // Should not throw exception
        assertDoesNotThrow(() -> channelManager.handleChannelFailure(channel, error));
    }

    @Test
    void testEstablishReplacementChannel() {
        // Should not throw exception even when no interfaces are available

package jcifs.smb1.util.transport;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;

/**
 * Exception thrown when transport-level errors occur in JCIFS SMB communication.
 */
public class TransportException extends IOException {

    /** The root cause exception */
    private Throwable rootCause;

    /**
     * Constructs a new TransportException with no detail message.
     */

import java.util.List;
import java.util.Map;
import java.util.Set;

import org.codelibs.core.exception.IORuntimeException;

import junit.framework.TestCase;

/**
 * @author higa
 *
 */
public class SerializeUtilTest extends TestCase {

    /**
     * @throws Exception
     */
    public void testSerialize() throws Exception {
        final String[] a = new String[] { "1", "2" };

        assertThrows(Exception.class, () -> {
            future.get(5, TimeUnit.SECONDS);
        });

        client.close();
    }

    @Test
    void testNotificationDelivery() throws Exception {
        // Setup successful registration
        WitnessRegisterResponse mockResponse = mock(WitnessRegisterResponse.class);

  @SuppressWarnings("DoNotMock")
  @Override
  protected void setUp() throws Exception {
    super.setUp();
    hasher = mock(Hasher.class);
    hashFunction = mock(HashFunction.class);

    when(hashFunction.newHasher()).thenReturn(hasher);
  }

  public void testWrite_putSingleByte() throws Exception {
    int b = 'q';
    HashingOutputStream out = new HashingOutputStream(hashFunction, buffer);

        // Both transports fail
        SmbTransportImpl trans1 = mock(SmbTransportImpl.class);
        SmbTransportImpl trans2 = mock(SmbTransportImpl.class);

        IOException firstException = new IOException("First failure");
        IOException secondException = new IOException("Second failure");

        when(trans1.unwrap(SmbTransportImpl.class)).thenReturn(trans1);
        when(trans1.ensureConnected()).thenThrow(firstException);

If you want to catch exceptions and create a custom response based on that, create a [Custom Exception Handler](../handling-errors.md#install-custom-exception-handlers).

## Dependencies with `yield` and `except` { #dependencies-with-yield-and-except }

import org.apache.lucene.search.PrefixQuery;
import org.apache.lucene.search.TermQuery;
import org.codelibs.fess.Constants;
import org.codelibs.fess.entity.QueryContext;
import org.codelibs.fess.exception.InvalidQueryException;
import org.codelibs.fess.mylasta.direction.FessConfig;
import org.codelibs.fess.util.ComponentUtil;
import org.dbflute.util.DfTypeUtil;
import org.junit.jupiter.api.Test;