Assert.assertSame(http, schmreg.getScheme("http"));
Assert.assertSame(http, schmreg.getScheme(host));
Assert.assertSame(https, schmreg.getScheme("https"));
Assert.assertSame(https, schmreg.getScheme(hosts));
schmreg.unregister("http");
schmreg.unregister("https");
Assert.assertNull(schmreg.get("http")); // get() does not throw exception
try {
schmreg.getScheme("http"); // getScheme() does throw exception