MTSValidPacketIteratorTest.java

/**
 * Copyright (c) Codice Foundation
 * <p>
 * This is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser
 * General Public License as published by the Free Software Foundation, either version 3 of the
 * License, or any later version.
 * <p>
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details. A copy of the GNU Lesser General Public License
 * is distributed along with this program and can be found at
 * <http://www.gnu.org/licenses/lgpl.html>.
 */
package org.codice.ddf.libs.mpeg.transport;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.is;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

import java.util.ArrayList;
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;
import org.taktik.mpegts.MTSPacket;
import org.taktik.mpegts.sources.ResettableMTSSource;

/**
 * Validate the behavior of {@link MTSValidPacketIterator}.
 */
@RunWith(MockitoJUnitRunner.class)
public class MTSValidPacketIteratorTest {

    @Mock
    private ResettableMTSSource mockSource;

    private List<MTSPacket> mockedValidPackets;

    private Iterator<MTSPacket> validPackets;

    private MTSValidPacketIterator packetIterator;

    @Before
    public void setup() throws Exception {
        packetIterator = new MTSValidPacketIterator(mockSource);
        mockedValidPackets = new ArrayList<>();

        mockedValidPackets.add(mock(MTSPacket.class));
        mockedValidPackets.add(mock(MTSPacket.class));
        mockedValidPackets.add(mock(MTSPacket.class));

        validPackets = mockedValidPackets.iterator();
    }

    @Test
    public void testBadPacketsAtBeginning() throws Exception {
        when(mockSource.nextPacket()).thenThrow(Exception.class)
                .thenThrow(Exception.class)
                .thenReturn(validPackets.next())
                .thenReturn(validPackets.next())
                .thenReturn(validPackets.next())
                .thenReturn(null);
        validatePacketsFromIterator();
        assertThat(packetIterator.getPacketsProcessed(), is(5L));
        assertThat(packetIterator.getPacketsFailed(), is(2L));
    }

    @Test
    public void testBadPacketsAtEnd() throws Exception {
        when(mockSource.nextPacket()).thenReturn(validPackets.next())
                .thenReturn(validPackets.next())
                .thenReturn(validPackets.next())
                .thenThrow(Exception.class)
                .thenThrow(Exception.class)
                .thenReturn(null);
        validatePacketsFromIterator();
        assertThat(packetIterator.getPacketsProcessed(), is(5L));
        assertThat(packetIterator.getPacketsFailed(), is(2L));
    }

    @Test
    public void testBadPacketsInbetween() throws Exception {
        when(mockSource.nextPacket()).thenReturn(validPackets.next())
                .thenThrow(Exception.class)
                .thenReturn(validPackets.next())
                .thenThrow(Exception.class)
                .thenThrow(Exception.class)
                .thenThrow(Exception.class)
                .thenReturn(validPackets.next())
                .thenReturn(null);
        validatePacketsFromIterator();
        assertThat(packetIterator.getPacketsProcessed(), is(7L));
        assertThat(packetIterator.getPacketsFailed(), is(4L));
    }

    private void validatePacketsFromIterator() throws Exception {
        mockedValidPackets.forEach(mtsPacket -> assertThat(mtsPacket,
                is(packetIterator.getNextValidPacket())));
        assertThat(null, is(packetIterator.getNextValidPacket()));
    }
}