server/container/util/src/test/java/org/apache/james/util/BodyOffsetInputStreamTest.java

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package org.apache.james.util;

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

import java.io.ByteArrayInputStream;
import java.io.IOException;

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

class BodyOffsetInputStreamTest {
    private String mail = "Subject: test\r\n\r\nbody";
    private long expectedOffset = 17;
    private long bytes = mail.length();

    @Test
    void testRead() throws IOException {
        BodyOffsetInputStream in = new BodyOffsetInputStream(new ByteArrayInputStream(mail.getBytes()));

        while (in.read() != -1) {
            // consume stream
        }
        assertThat(in.getBodyStartOffset()).isEqualTo(expectedOffset);
        assertThat(in.getReadBytes()).isEqualTo(bytes);
        in.close();
    }

    @Test
    void testReadWithArray() throws IOException {
        BodyOffsetInputStream in = new BodyOffsetInputStream(new ByteArrayInputStream(mail.getBytes()));

        byte[] b = new byte[8];
        while (in.read(b) != -1) {
            // consume stream
        }
        assertThat(in.getBodyStartOffset()).isEqualTo(expectedOffset);
        assertThat(in.getReadBytes()).isEqualTo(bytes);
        in.close();
    }

    @Test
    void testReadWithArrayBiggerThenStream() throws IOException {
        BodyOffsetInputStream in = new BodyOffsetInputStream(new ByteArrayInputStream(mail.getBytes()));

        byte[] b = new byte[4096];
        while (in.read(b) != -1) {
            // consume stream
        }
        assertThat(in.getBodyStartOffset()).isEqualTo(expectedOffset);
        assertThat(in.getReadBytes()).isEqualTo(bytes);
        in.close();
    }
}