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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.util;

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

import java.io.ByteArrayInputStream;
import java.nio.charset.StandardCharsets;

import org.apache.james.util.io.InputStreamUtils;
import org.junit.jupiter.api.Test;

import com.google.common.primitives.Bytes;

class InputStreamUtilsTest {
    private static final byte[] CONTENT_1 = "content1".getBytes(StandardCharsets.UTF_8);
    private static final byte[] CONTENT_2 = "content2".getBytes(StandardCharsets.UTF_8);
    private static final byte[] EMPTY = "".getBytes(StandardCharsets.UTF_8);

    @Test
    void concatShouldNoopWhenSingleArgument() {
        assertThat(InputStreamUtils.concat(new ByteArrayInputStream(CONTENT_1)))
            .hasSameContentAs(new ByteArrayInputStream(CONTENT_1));
    }

    @Test
    void concatShouldReturnConcatenatedStreams() {
        assertThat(InputStreamUtils.concat(new ByteArrayInputStream(CONTENT_1), new ByteArrayInputStream(CONTENT_2)))
            .hasSameContentAs(new ByteArrayInputStream(Bytes.concat(CONTENT_1, CONTENT_2)));
    }

    @Test
    void concatShouldNoopWhenEmpty() {
        assertThat(InputStreamUtils.concat(new ByteArrayInputStream(CONTENT_1), new ByteArrayInputStream(EMPTY)))
            .hasSameContentAs(new ByteArrayInputStream(CONTENT_1));
    }
}