public void testRemoveNonExistantField() throws Exception {
Header header = new Header();
header.addField(Field.parse("Received: from foo by bar for james"));
header.addField(Field.parse("Content-type: text/plain; charset=US-ASCII"));
header.addField(Field.parse("ReCeIvEd: from bar by foo for james"));
assertEquals(0, header.removeFields("noSuchField"));
assertEquals(3, header.getFields().size());
assertEquals(2, header.getFields("received").size());