type TargetList struct {
	sync.RWMutex
	targets map[TargetID]Target
}

// Add - adds unique target to target list.
func (list *TargetList) Add(targets ...Target) error {
	list.Lock()
	defer list.Unlock()

	for _, target := range targets {
		if _, ok := list.targets[target.ID()]; ok {
			return fmt.Errorf("target %v already exists", target.ID())
		}
		list.targets[target.ID()] = target
	}

    }

    /*
     * This is an unsynchronized read! After the read, the function returns immediately or acquires
     * the lock to check again. Since an IDLE state was observed inside the preceding synchronized
     * block, and reference field assignment is atomic, this may save reacquiring the lock when
     * another thread or the worker task has cleared the count and set the state.
     *

    }

    /*
     * This is an unsynchronized read! After the read, the function returns immediately or acquires
     * the lock to check again. Since an IDLE state was observed inside the preceding synchronized
     * block, and reference field assignment is atomic, this may save reacquiring the lock when
     * another thread or the worker task has cleared the count and set the state.
     *

    @Test
    @DisplayName("Available returns underlying stream available when no message buffered")
    void availableReturnsUnderlyingWhenNoMessage() throws IOException {
        // Mock input stream that reports available bytes
        InputStream mockIn = mock(InputStream.class);
        when(mockIn.available()).thenReturn(42);

        SocketInputStream sis = new SocketInputStream(mockIn);

        TransferResource resource = new TransferResource(null, null, "http://maven.org/test/test-resource", null, null);

        RepositorySystemSession session = Mockito.mock(RepositorySystemSession.class);
        TransferListener delegate = Mockito.mock(TransferListener.class);
        SimplexTransferListener listener = new SimplexTransferListener(delegate);

from unittest.mock import patch

from docs_src.python_types.tutorial006_py39 import process_items


def test_process_items():
    with patch("builtins.print") as mock_print:
        process_items(["item_a", "item_b", "item_c"])

    assert mock_print.call_count == 3
    call_args = [arg.args for arg in mock_print.call_args_list]
    assert call_args == [
        ("item_a",),
        ("item_b",),
        ("item_c",),

// if it is not successful yet.
func (l *Init) Do(f func() error) error {
	if atomic.LoadUint32(&l.done) == 0 {
		return l.do(f)
	}
	return nil
}

func (l *Init) do(f func() error) error {
	l.m.Lock()
	defer l.m.Unlock()
	if atomic.LoadUint32(&l.done) == 0 {
		if err := f(); err != nil {
			return err
		}
		// Mark as done only when f() is successful
		atomic.StoreUint32(&l.done, 1)
	}
	return nil
}

import org.junit.jupiter.api.Test;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;

import jcifs.Configuration;
import jcifs.internal.SMBProtocolDecodingException;
import jcifs.smb.FileEntry;

/**
 * Test class for SmbComTransactionResponse
 */
class SmbComTransactionResponseTest {

    @Mock
    private Configuration mockConfig;

    @Mock
    private FileEntry mockFileEntry1;

    @Mock

        CrawlingParameterUtil.setUrlQueueService(null);
        CrawlingParameterUtil.setDataService(null);
        super.tearDown();
    }

    // Helper method to create a simple mock UrlQueue
    private UrlQueue<?> createMockUrlQueue(final String sessionId, final String url) {
        return new UrlQueue<Object>() {
            @Override
            public Object getId() {
                return null;

Sie möchten den externen Anbieter wahrscheinlich einmal testen, ihn aber nicht unbedingt bei jedem weiteren ausgeführten Test aufrufen.

In diesem Fall können Sie die Abhängigkeit, die diesen Anbieter aufruft, überschreiben und eine benutzerdefinierte Abhängigkeit verwenden, die einen Mock-Benutzer zurückgibt, nur für Ihre Tests.