Add testcase for #525

package com.fsck.k9.mailstore;

import android.test.AndroidTestCase;

import com.fsck.k9.Preferences;

import com.fsck.k9.mail.internet.MimeBodyPart;

import com.fsck.k9.mail.internet.MimeMultipart;

public class LocalMessageTest extends AndroidTestCase {

    private LocalMessage message;

    @Override

    public void setUp() throws Exception {

        super.setUp();

        Preferences preferences = Preferences.getPreferences(getContext());

        LocalStore store = LocalStore.getInstance(preferences.newAccount(), getContext());

        message = new LocalMessage(store, "uid", new LocalFolder(store, "test"));

    }

    public void testGetDisplayTextWithPlainTextPart() throws Exception {

        String textBodyText = "text body";

        MimeMultipart multipart = new MimeMultipart();

        MimeBodyPart bodyPart1 = new MimeBodyPart(new LocalTextBody(textBodyText, textBodyText), "text/plain");

        multipart.addBodyPart(bodyPart1);

        message.setBody(multipart);

        assertEquals("text body", message.getTextForDisplay());

    }

    public void testGetDisplayTextWithHtmlPart() throws Exception {

        String htmlBodyText = "html body";

        String textBodyText = "text body";

        MimeMultipart multipart = new MimeMultipart();

        MimeBodyPart bodyPart1 = new MimeBodyPart(new LocalTextBody(htmlBodyText, htmlBodyText), "text/html");

        MimeBodyPart bodyPart2 = new MimeBodyPart(new LocalTextBody(textBodyText, textBodyText), "text/plain");

        multipart.addBodyPart(bodyPart1);

        multipart.addBodyPart(bodyPart2);

        message.setBody(multipart);

        assertEquals("html body", message.getTextForDisplay());

    }

}