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 * regarding copyright ownership.  The ASF licenses this file   *
 * to you under the Apache License, Version 2.0 (the            *
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package org.apache.james.mailbox.store;

import static org.assertj.core.api.Assertions.assertThat;

import org.apache.james.mailbox.MessageUid;
import org.apache.james.mailbox.exception.MailboxException;
import org.apache.james.mailbox.model.MessageRange;
import org.junit.Test;

import com.google.common.collect.Lists;

public class MessageBatcherTest {

    private MessageBatcher.BatchedOperation incrementBatcher =
        messageRange -> Lists.<MessageRange>newArrayList(MessageRange.range(
            messageRange.getUidFrom().next(),
            messageRange.getUidTo().next()));

    @Test
    public void batchMessagesShouldWorkOnSingleRangeMode() throws Exception {
        MessageBatcher messageBatcher = new MessageBatcher(0);
        
        assertThat(messageBatcher.batchMessages(MessageRange.range(MessageUid.of(1), MessageUid.of(10)), incrementBatcher))
            .containsOnly(MessageRange.range(MessageUid.of(2), MessageUid.of(11)));
    }

    @Test
    public void batchMessagesShouldWorkWithNonZeroBatchedSize() throws Exception {
        MessageBatcher messageBatcher = new MessageBatcher(5);

        assertThat(messageBatcher.batchMessages(MessageRange.range(MessageUid.of(1), MessageUid.of(10)), incrementBatcher))
            .containsOnly(MessageRange.range(MessageUid.of(2), MessageUid.of(6)), MessageRange.range(MessageUid.of(7), MessageUid.of(11)));
    }

    @Test(expected = MailboxException.class)
    public void batchMessagesShouldPropagateExceptions() throws Exception {
        MessageBatcher messageBatcher = new MessageBatcher(0);

        messageBatcher.batchMessages(MessageRange.range(MessageUid.of(1), MessageUid.of(10)),
            messageRange -> {
                throw new MailboxException();
            });
    }

    @Test(expected = IllegalArgumentException.class)
    public void messageBatcherShouldThrowOnNegativeBatchSize() throws Exception {
        new MessageBatcher(-1);
    }

    @Test
    public void getBatchSizeShouldReturnTheBatchSize() {
        int batchSize = 123;
        MessageBatcher messageBatcher = new MessageBatcher(batchSize);
        assertThat(messageBatcher.getBatchSize()).isEqualTo(batchSize);
    }
}
