KinesisReaderTest.java example

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.beam.sdk.io.kinesis;

import static java.util.Arrays.asList;
import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.Mockito.when;

import java.io.IOException;
import java.util.NoSuchElementException;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.runners.MockitoJUnitRunner;

/**
 * Tests {@link KinesisReader}.
 */
@RunWith(MockitoJUnitRunner.class)
public class KinesisReaderTest {
    @Mock
    private SimplifiedKinesisClient kinesis;
    @Mock
    private CheckpointGenerator generator;
    @Mock
    private ShardCheckpoint firstCheckpoint, secondCheckpoint;
    @Mock
    private ShardRecordsIterator firstIterator, secondIterator;
    @Mock
    private KinesisRecord a, b, c, d;

    private KinesisReader reader;

    @Before
    public void setUp() throws IOException, TransientKinesisException {
        when(generator.generate(kinesis)).thenReturn(new KinesisReaderCheckpoint(
                asList(firstCheckpoint, secondCheckpoint)
        ));
        when(firstCheckpoint.getShardRecordsIterator(kinesis)).thenReturn(firstIterator);
        when(secondCheckpoint.getShardRecordsIterator(kinesis)).thenReturn(secondIterator);
        when(firstIterator.next()).thenReturn(CustomOptional.<KinesisRecord>absent());
        when(secondIterator.next()).thenReturn(CustomOptional.<KinesisRecord>absent());

        reader = new KinesisReader(kinesis, generator, null);
    }

    @Test
    public void startReturnsFalseIfNoDataAtTheBeginning() throws IOException {
        assertThat(reader.start()).isFalse();
    }

    @Test(expected = NoSuchElementException.class)
    public void throwsNoSuchElementExceptionIfNoData() throws IOException {
        reader.start();
        reader.getCurrent();
    }

    @Test
    public void startReturnsTrueIfSomeDataAvailable() throws IOException,
            TransientKinesisException {
        when(firstIterator.next()).
                thenReturn(CustomOptional.of(a)).
                thenReturn(CustomOptional.<KinesisRecord>absent());

        assertThat(reader.start()).isTrue();
    }

    @Test
    public void advanceReturnsFalseIfThereIsTransientExceptionInKinesis()
            throws IOException, TransientKinesisException {
        reader.start();

        when(firstIterator.next()).thenThrow(TransientKinesisException.class);

        assertThat(reader.advance()).isFalse();
    }

    @Test
    public void readsThroughAllDataAvailable() throws IOException, TransientKinesisException {
        when(firstIterator.next()).
                thenReturn(CustomOptional.<KinesisRecord>absent()).
                thenReturn(CustomOptional.of(a)).
                thenReturn(CustomOptional.<KinesisRecord>absent()).
                thenReturn(CustomOptional.of(b)).
                thenReturn(CustomOptional.<KinesisRecord>absent());

        when(secondIterator.next()).
                thenReturn(CustomOptional.of(c)).
                thenReturn(CustomOptional.<KinesisRecord>absent()).
                thenReturn(CustomOptional.of(d)).
                thenReturn(CustomOptional.<KinesisRecord>absent());

        assertThat(reader.start()).isTrue();
        assertThat(reader.getCurrent()).isEqualTo(c);
        assertThat(reader.advance()).isTrue();
        assertThat(reader.getCurrent()).isEqualTo(a);
        assertThat(reader.advance()).isTrue();
        assertThat(reader.getCurrent()).isEqualTo(d);
        assertThat(reader.advance()).isTrue();
        assertThat(reader.getCurrent()).isEqualTo(b);
        assertThat(reader.advance()).isFalse();
    }

}