How do you test code that uses synchronized?

Testing code that uses synchronization in Java can be challenging due to the inherent complexities of multithreading. It's important to ensure that the code behaves as expected when multiple threads access shared resources. Below is an example of how to effectively test synchronized code using unit tests.


    // Example of a synchronized method in Java
    public class Counter {
        private int count = 0;

        // Synchronized method to increment count
        public synchronized void increment() {
            count++;
        }

        public int getCount() {
            return count;
        }
    }

    // Test for Counter class
    import org.junit.jupiter.api.Test;
    import static org.junit.jupiter.api.Assertions.assertEquals;

    public class CounterTest {

        @Test
        public void testIncrement() throws InterruptedException {
            Counter counter = new Counter();
            Thread t1 = new Thread(() -> {
                for (int i = 0; i < 1000; i++) {
                    counter.increment();
                }
            });

            Thread t2 = new Thread(() -> {
                for (int i = 0; i < 1000; i++) {
                    counter.increment();
                }
            });

            t1.start();
            t2.start();
            t1.join();
            t2.join();

            assertEquals(2000, counter.getCount());
        }
    }

How do you test code that uses synchronized?

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How do you test code that uses synchronized?

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