73 lines
2.0 KiB
Java
73 lines
2.0 KiB
Java
/*
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* Copyright (C) 2014 The Dagger Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dagger.producers.internal;
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import static com.google.common.truth.Truth.assertThat;
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import static org.junit.Assert.fail;
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import com.google.common.util.concurrent.Futures;
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import com.google.common.util.concurrent.ListenableFuture;
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import dagger.producers.Producer;
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import org.junit.Test;
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import org.junit.runner.RunWith;
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import org.junit.runners.JUnit4;
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/**
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* Tests {@link AbstractProducer}.
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*/
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@RunWith(JUnit4.class)
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public class AbstractProducerTest {
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@Test
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@SuppressWarnings("CheckReturnValue")
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public void get_nullPointerException() {
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Producer<Object> producer = new DelegateProducer<>(null);
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try {
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producer.get();
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fail();
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} catch (NullPointerException expected) {
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}
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}
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@Test public void get() throws Exception {
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Producer<Integer> producer =
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new AbstractProducer<Integer>() {
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int i = 0;
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@Override
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public ListenableFuture<Integer> compute() {
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return Futures.immediateFuture(i++);
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}
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};
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assertThat(producer.get().get()).isEqualTo(0);
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assertThat(producer.get().get()).isEqualTo(0);
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assertThat(producer.get().get()).isEqualTo(0);
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}
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static final class DelegateProducer<T> extends AbstractProducer<T> {
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private final ListenableFuture<T> delegate;
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DelegateProducer(ListenableFuture<T> delegate) {
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this.delegate = delegate;
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}
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@Override
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public ListenableFuture<T> compute() {
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return delegate;
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}
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}
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}
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