gecko-dev/netwerk/test/unit/test_ioservice.js

"use strict";

ChromeUtils.import('resource://gre/modules/Services.jsm');

add_task(function test_extractScheme(){
  equal(Services.io.extractScheme("HtTp://example.com"), "http");
  Assert.throws(() => { Services.io.extractScheme("://example.com"); },
                /NS_ERROR_MALFORMED_URI/, "missing scheme");
  Assert.throws(() => { Services.io.extractScheme("ht%tp://example.com"); },
                /NS_ERROR_MALFORMED_URI/, "bad scheme");
});