Header header = new HeaderImpl();
header.addField(DefaultFieldParser.parse("Received: from foo by bar for james"));
header.addField(DefaultFieldParser.parse("Content-type: text/plain; charset=US-ASCII"));
header.addField(DefaultFieldParser.parse("ReCeIvEd: from bar by foo for james"));
assertEquals(0, header.removeFields("noSuchField"));
assertEquals(3, header.getFields().size());
assertEquals(2, header.getFields("received").size());
assertEquals(1, header.getFields("Content-Type").size());
}