source: src/test/java/geniusweb/partiesserver/repository/RunningPartiesRepoTest.java@ 19

package geniusweb.partiesserver.repository;

import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

import java.util.LinkedList;
import java.util.List;

import org.junit.Test;

import geniusweb.actions.PartyId;
import tudelft.utilities.logging.Reporter;
import tudelft.utilities.repository.NoResourcesNowException;

public class RunningPartiesRepoTest {
        @Test
        public void smokeTest() {
                new RunningPartiesRepo(mock(Reporter.class));
        }

        @Test
        public void testSimpleParallelPuts() throws InterruptedException {
                RunningPartiesRepo repo = new RunningPartiesRepo(mock(Reporter.class));

                List<SimpleThread> threads = new LinkedList<SimpleThread>();
                for (int n = 0; n < RunningPartiesRepo.MAX_SLOTS; n++) {
                        RunningParty newParty = mock(RunningParty.class);
                        when(newParty.getID()).thenReturn(new PartyId("party" + n));

                        SimpleThread thread = new SimpleThread() {

                                @Override
                                public void run1() throws NoResourcesNowException {
                                        try {
                                                Thread.sleep(30);
                                        } catch (InterruptedException e) {
                                                // TODO Auto-generated catch block
                                                e.printStackTrace();
                                        }
                                        repo.put(newParty);
                                }
                        };
                        threads.add(thread);
                        thread.start();
                }

                for (SimpleThread thread : threads) {
                        thread.join();
                        assertNull(thread.getException());
                }

        }

        @Test
        public void testTooManyParallelPuts() throws InterruptedException {
                RunningPartiesRepo repo = new RunningPartiesRepo(mock(Reporter.class));

                List<SimpleThread> threads = new LinkedList<SimpleThread>();
                for (int n = 0; n < RunningPartiesRepo.MAX_SLOTS + 1; n++) {
                        RunningParty newParty = mock(RunningParty.class);
                        when(newParty.getID()).thenReturn(new PartyId("party" + n));

                        SimpleThread thread = new SimpleThread() {

                                @Override
                                public void run1()
                                                throws InterruptedException, NoResourcesNowException {
                                        Thread.sleep(30);
                                        repo.put(newParty);
                                }
                        };
                        threads.add(thread);
                        thread.start();
                }

                for (SimpleThread thread : threads) {
                        thread.join();
                }

                assertTrue("One of the threads should have bounced", threads.stream()
                                .anyMatch(thread -> thread.getException() != null));

        }

}

/**
 * Thread that stores exceptions so that we can later check what happened.
 * Override {@link #run1()} instead of {@link #run()}
 */
abstract class SimpleThread extends Thread {
        private Exception exception = null;

        @Override
        public void run() {
                try {
                        run1();
                } catch (Exception e) {
                        this.exception = e;
                        e.printStackTrace();
                }
        }

        public Exception getException() {
                return exception;
        }

        abstract void run1() throws Exception;
}