/*
 * 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 com.google.common.collect.Iterables;
import java.util.Iterator;
import java.util.List;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.runners.MockitoJUnitRunner;

/***
 *
 */
@RunWith(MockitoJUnitRunner.class)
public class KinesisReaderCheckpointTest {
    @Mock
    private ShardCheckpoint a, b, c;

    private KinesisReaderCheckpoint checkpoint;

    @Before
    public void setUp() {
        checkpoint = new KinesisReaderCheckpoint(asList(a, b, c));
    }

    @Test
    public void splitsCheckpointAccordingly() {
        verifySplitInto(1);
        verifySplitInto(2);
        verifySplitInto(3);
        verifySplitInto(4);
    }

    @Test(expected = UnsupportedOperationException.class)
    public void isImmutable() {
        Iterator<ShardCheckpoint> iterator = checkpoint.iterator();
        iterator.remove();
    }

    private void verifySplitInto(int size) {
        List<KinesisReaderCheckpoint> split = checkpoint.splitInto(size);
        assertThat(Iterables.concat(split)).containsOnly(a, b, c);
        assertThat(split).hasSize(Math.min(size, 3));
    }
}