Added unit test for MimeUtility.getHeaderParameter()

package com.fsck.k9.mail.internet;

import android.test.AndroidTestCase;

public class MimeUtilityTest extends AndroidTestCase {

    public void testGetHeaderParameter() {

        String result;

        /* Test edge cases */

        result = MimeUtility.getHeaderParameter(";", null);

        assertEquals(null, result);

        result = MimeUtility.getHeaderParameter("name", "name");

        assertEquals(null, result);

        result = MimeUtility.getHeaderParameter("name=", "name");

        assertEquals("", result);

        result = MimeUtility.getHeaderParameter("name=\"", "name");

        assertEquals("\"", result);

        /* Test expected cases */

        result = MimeUtility.getHeaderParameter("name=value", "name");

        assertEquals("value", result);

        result = MimeUtility.getHeaderParameter("name = value", "name");

        assertEquals("value", result);

        result = MimeUtility.getHeaderParameter("name=\"value\"", "name");

        assertEquals("value", result);

        result = MimeUtility.getHeaderParameter("name = \"value\"" , "name");

        assertEquals("value", result);

        result = MimeUtility.getHeaderParameter("name=\"\"", "name");

        assertEquals("", result);

    }

}