FlowableMapNotificationTest.java

/**
 * Copyright 2016 Netflix, Inc.
 * 
 * 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.operators.flowable;

import java.util.concurrent.Callable;

import org.junit.Test;

import io.reactivex.Flowable;
import io.reactivex.functions.Function;
import io.reactivex.processors.PublishProcessor;
import io.reactivex.subscribers.TestSubscriber;

public class FlowableMapNotificationTest {
    @Test
    public void testJust() {
        TestSubscriber<Object> ts = new TestSubscriber<Object>();
        Flowable.just(1)
        .flatMap(
                new Function<Integer, Flowable<Object>>() {
                    @Override
                    public Flowable<Object> apply(Integer item) {
                        return Flowable.just((Object)(item + 1));
                    }
                },
                new Function<Throwable, Flowable<Object>>() {
                    @Override
                    public Flowable<Object> apply(Throwable e) {
                        return Flowable.error(e);
                    }
                },
                new Callable<Flowable<Object>>() {
                    @Override
                    public Flowable<Object> call() {
                        return Flowable.never();
                    }
                }
        ).subscribe(ts);
        
        ts.assertNoErrors();
        ts.assertNotComplete();
        ts.assertValue(2);
    }
    
    @Test
    public void backpressure() {
        TestSubscriber<Object> ts = TestSubscriber.create(0L);

        new FlowableMapNotification<Integer, Integer>(Flowable.range(1, 3),
                new Function<Integer, Integer>() {
                    @Override
                    public Integer apply(Integer item) {
                        return item + 1;
                    }
                },
                new Function<Throwable, Integer>() {
                    @Override
                    public Integer apply(Throwable e) {
                        return 0;
                    }
                },
                new Callable<Integer>() {
                    @Override
                    public Integer call() {
                        return 5;
                    }
                }
        ).subscribe(ts);
        
        ts.assertNoValues();
        ts.assertNoErrors();
        ts.assertNotComplete();
        
        ts.request(3);
        
        ts.assertValues(2, 3, 4);
        ts.assertNoErrors();
        ts.assertNotComplete();

        ts.request(1);
        
        ts.assertValues(2, 3, 4, 5);
        ts.assertNoErrors();
        ts.assertComplete();
    }

    @Test
    public void noBackpressure() {
        TestSubscriber<Object> ts = TestSubscriber.create(0L);

        PublishProcessor<Integer> ps = PublishProcessor.create();
        
        new FlowableMapNotification<Integer, Integer>(ps, 
                new Function<Integer, Integer>() {
                    @Override
                    public Integer apply(Integer item) {
                        return item + 1;
                    }
                },
                new Function<Throwable, Integer>() {
                    @Override
                    public Integer apply(Throwable e) {
                        return 0;
                    }
                },
                new Callable<Integer>() {
                    @Override
                    public Integer call() {
                        return 5;
                    }
                }
        ).subscribe(ts);
        
        ts.assertNoValues();
        ts.assertNoErrors();
        ts.assertNotComplete();
        
        ps.onNext(1);
        ps.onNext(2);
        ps.onNext(3);
        ps.onComplete();
        
        ts.assertNoValues();
        ts.assertNoErrors();
        ts.assertNotComplete();
        
        ts.request(1);
        
        ts.assertValue(0);
        ts.assertNoErrors();
        ts.assertComplete();
        
    }
}