FutureSingleObserverTest.java

/**
 * Copyright (c) 2016-present, RxJava Contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is
 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
 * the License for the specific language governing permissions and limitations under the License.
 */

package io.reactivex.internal.observers;

import static org.junit.Assert.*;

import java.util.concurrent.*;

import org.junit.Test;

import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.exceptions.TestException;
import io.reactivex.schedulers.Schedulers;
import io.reactivex.subjects.PublishSubject;

public class FutureSingleObserverTest {

    @Test
    public void cancel() {
        final Future<?> f = Single.never().toFuture();

        assertFalse(f.isCancelled());
        assertFalse(f.isDone());

        f.cancel(true);

        assertTrue(f.isCancelled());
        assertTrue(f.isDone());

        try {
            f.get();
            fail("Should have thrown!");
        } catch (CancellationException ex) {
            // expected
        } catch (InterruptedException ex) {
            throw new AssertionError(ex);
        } catch (ExecutionException ex) {
            throw new AssertionError(ex);
        }

        try {
            f.get(5, TimeUnit.SECONDS);
            fail("Should have thrown!");
        } catch (CancellationException ex) {
            // expected
        } catch (InterruptedException ex) {
            throw new AssertionError(ex);
        } catch (ExecutionException ex) {
            throw new AssertionError(ex);
        } catch (TimeoutException ex) {
            throw new AssertionError(ex);
        }
    }

    @Test
    public void cancelRace() {
        for (int i = 0; i < 500; i++) {
            final Future<?> f = Single.never().toFuture();

            Runnable r = new Runnable() {
                @Override
                public void run() {
                    f.cancel(true);
                }
            };

            TestHelper.race(r, r, Schedulers.single());
        }
    }

    @Test
    public void timeout() throws Exception {

        Future<?> f = Single.never().toFuture();

        try {
            f.get(100, TimeUnit.MILLISECONDS);
            fail("Should have thrown");
        } catch (TimeoutException ex) {
            // expected
        }
    }

    @Test
    public void dispose() {
        Future<Integer> f = Single.just(1).toFuture();

        ((Disposable)f).dispose();

        assertTrue(((Disposable)f).isDisposed());
    }

    @Test
    public void errorGetWithTimeout() throws Exception {
        Future<?> f = Single.error(new TestException()).toFuture();

        try {
            f.get(5, TimeUnit.SECONDS);
            fail("Should have thrown");
        } catch (ExecutionException ex) {
            assertTrue(ex.toString(), ex.getCause() instanceof TestException);
        }
    }

    @Test
    public void normalGetWitHTimeout() throws Exception {
        Future<Integer> f = Single.just(1).toFuture();

        assertEquals(1, f.get(5, TimeUnit.SECONDS).intValue());
    }

    @Test
    public void getAwait() throws Exception {
        Future<Integer> f = Single.just(1).delay(100, TimeUnit.MILLISECONDS).toFuture();

        assertEquals(1, f.get(5, TimeUnit.SECONDS).intValue());
    }

    @Test
    public void onSuccessCancelRace() {
        for (int i = 0; i < 500; i++) {
            final PublishSubject<Integer> ps = PublishSubject.create();

            final Future<?> f = ps.single(-99).toFuture();

            ps.onNext(1);

            Runnable r1 = new Runnable() {
                @Override
                public void run() {
                    f.cancel(true);
                }
            };

            Runnable r2 = new Runnable() {
                @Override
                public void run() {
                    ps.onComplete();
                }
            };

            TestHelper.race(r1, r2, Schedulers.single());
        }
    }

    @Test
    public void onErrorCancelRace() {
        for (int i = 0; i < 500; i++) {
            final PublishSubject<Integer> ps = PublishSubject.create();

            final Future<?> f = ps.single(-99).toFuture();

            final TestException ex = new TestException();

            Runnable r1 = new Runnable() {
                @Override
                public void run() {
                    f.cancel(true);
                }
            };

            Runnable r2 = new Runnable() {
                @Override
                public void run() {
                    ps.onError(ex);
                }
            };

            TestHelper.race(r1, r2, Schedulers.single());
        }
    }
}