Проверка взаимодействий с моками

import static org.mockito.Mockito.*;

interface MyService {
    void doSomething();
}

class MyProcessor {
    private MyService service;
    public MyProcessor(MyService service) {
        this.service = service;
    }
    public void execute() {
        service.doSomething();
    }
}

public class Main {
    public static void main(String[] args) {
        MyService mockService = mock(MyService.class);
        MyProcessor processor = new MyProcessor(mockService);

        System.out.println("Calling execute...");
        processor.execute(); // This calls mockService.doSomething()

        try {
            // Verify doSomething() was called exactly once
            verify(mockService).doSomething();
            System.out.println("\nVerification successful: doSomething() called once.");
        } catch (Throwable e) {
            System.out.println("\nVerification failed: " + e.getMessage());
        }
        System.out.println("Program finished.");
    }
}

import static org.mockito.Mockito.*;

interface DataSender {
    void send(String message, int priority);
}

class MessageProcessor {
    private DataSender sender;
    public MessageProcessor(DataSender sender) {
        this.sender = sender;
    }
    public void processAndSend(String data) {
        sender.send(data.toUpperCase(), 1);
    }
}

public class Main {
    public static void main(String[] args) {
        DataSender mockSender = mock(DataSender.class);
        MessageProcessor processor = new MessageProcessor(mockSender);

        System.out.println("Processing 'hello' message...");
        processor.processAndSend("hello");

        try {
            // Verify send() was called with "HELLO" and 1
            verify(mockSender).send(eq("HELLO"), eq(1));
            System.out.println("\nVerification successful: Correct arguments received.");
        } catch (Throwable e) {
            System.out.println("\nVerification failed: " + e.getMessage());
        }

        // The following commented block shows a failing verification
        // try {
        //     verify(mockSender).send(eq("hello"), eq(1)); // "hello" (lowercase) is wrong
        //     System.out.println("This should not be printed.");
        // } catch (Throwable e) {
        //     System.out.println("Expected failure for wrong arguments: " + e.getMessage());
        // }
        System.out.println("Program finished.");
    }
}

import static org.mockito.Mockito.*;

interface EventLogger {
    void log(String event);
}

class EventProcessor {
    private EventLogger logger;
    public EventProcessor(EventLogger logger) {
        this.logger = logger;
    }
    public void processEvents(int count) {
        for (int i = 0; i < count; i++) {
            logger.log("Event " + (i + 1));
        }
    }
    public void logError(String error) {
        logger.log("ERROR: " + error);
    }
}

public class Main {
    public static void main(String[] args) {
        EventLogger mockLogger = mock(EventLogger.class);
        EventProcessor processor = new EventProcessor(mockLogger);

        System.out.println("Processing 3 events and logging an error...");
        processor.processEvents(3);
        processor.logError("Failed to connect");

        try {
            // Verify log() was called 3 times with arguments starting with "Event "
            verify(mockLogger, times(3)).log(startsWith("Event "));
            System.out.println("\nVerification successful: 'Event' logged 3 times.");

            // Verify log() was called once with the exact error message
            verify(mockLogger, times(1)).log(eq("ERROR: Failed to connect"));
            System.out.println("Verification successful: Error logged once.");

            // Verify log() was never called with arguments starting with "WARNING"
            verify(mockLogger, never()).log(startsWith("WARNING"));
            System.out.println("Verification successful: 'WARNING' never logged.");

        } catch (Throwable e) {
            System.out.println("\nVerification failed: " + e.getMessage());
        }
        System.out.println("Program finished.");
    }
}