dom/src/test/java/org/apache/james/mime4j/dom/MessageWriteToTest.java

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package org.apache.james.mime4j.dom;

import org.apache.james.mime4j.ExampleMail;
import org.apache.james.mime4j.message.DefaultMessageBuilder;
import org.apache.james.mime4j.message.DefaultMessageWriter;
import org.junit.Assert;
import org.junit.Test;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;

public class MessageWriteToTest {

    @Test
    public void testSimpleMail() throws Exception {
        Message message = createMessage(ExampleMail.RFC822_SIMPLE_BYTES);
        Assert.assertFalse("Not multipart", message.isMultipart());
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        DefaultMessageWriter writer = new DefaultMessageWriter();
        writer.writeMessage(message, out);
        assertEquals(out.toByteArray(), ExampleMail.RFC822_SIMPLE_BYTES);
    }

    private void assertEquals(byte[] expected, byte[] actual) {
        StringBuilder buffer = new StringBuilder(expected.length);
        Assert.assertEquals(new String(expected), new String(actual));
        Assert.assertEquals(expected.length, actual.length);
        for (int i = 0; i < actual.length; i++) {
            buffer.append((char) actual[i]);
            Assert.assertEquals("Mismatch@" + i, expected[i], actual[i]);
        }
    }

    @Test
    public void testBinaryAttachment() throws Exception {
        Message message = createMessage(ExampleMail.MULTIPART_WITH_BINARY_ATTACHMENTS_BYTES);
        Assert.assertTrue("Is multipart", message.isMultipart());
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        DefaultMessageWriter writer = new DefaultMessageWriter();
        writer.writeMessage(message, out);
        assertEquals(ExampleMail.MULTIPART_WITH_BINARY_ATTACHMENTS_BYTES, out.toByteArray());
    }

    @Test
    public void testBinaryAttachmentNoPreamble() throws Exception {
        Message message = createMessage(ExampleMail.MULTIPART_WITH_BINARY_ATTACHMENTS_NOPREAMBLE_BYTES);
        Assert.assertTrue("Is multipart", message.isMultipart());
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        DefaultMessageWriter writer = new DefaultMessageWriter();
        writer.writeMessage(message, out);
        assertEquals(ExampleMail.MULTIPART_WITH_BINARY_ATTACHMENTS_NOPREAMBLE_BYTES, out.toByteArray());
    }

    @Test
    public void testBinaryAttachmentPreambleEpilogue() throws Exception {
        Message message = createMessage(ExampleMail.MULTIPART_WITH_BINARY_ATTACHMENTS_PREAMBLE_EPILOGUE_BYTES);
        Assert.assertTrue("Is multipart", message.isMultipart());
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        DefaultMessageWriter writer = new DefaultMessageWriter();
        writer.writeMessage(message, out);
        assertEquals(ExampleMail.MULTIPART_WITH_BINARY_ATTACHMENTS_PREAMBLE_EPILOGUE_BYTES, out.toByteArray());
    }

    private Message createMessage(byte[] octets) throws Exception {
        ByteArrayInputStream in = new ByteArrayInputStream(octets);
        DefaultMessageBuilder builder = new DefaultMessageBuilder();
        return builder.parseMessage(in);
    }
}