Testing GM_watchValue and GM_unwatchValue

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// ==UserScript==
// @id             [email protected]
// @name           GM_watchValue test
// @version        1.0
// @namespace      phob.net
// @author         wn
// @description    Testing GM_watchValue and GM_unwatchValue
// @include        http://phob.net/
// @run-at         document-end
// ==/UserScript==

GM_setValue("foo", "bar");

function myObserver1(aNotice) {
  GM_log("#1 observed '" + aNotice.name
       + "' changed from '" + aNotice.oldValue
       + "' to '" + aNotice.newValue + "'");
}

function myObserver2(aNotice) {
  GM_log("#2 observed '" + aNotice.name
       + "' changed from '" + aNotice.oldValue
       + "' to '" + aNotice.newValue + "'");
}

var obs1UUID = GM_watchValue("foo", myObserver1);
GM_log("'foo' observer #1 GUID == " + obs1UUID);

var obs2UUID = GM_watchValue("foo", myObserver2);
GM_log("'foo' observer #2 GUID == " + obs1UUID);

GM_setValue("foo", "baz");

if (GM_unwatchValue("foo", obs1UUID)) {
  GM_log("removed 'foo' observer #1");
} else {
  GM_log("unable to remove 'foo' observer #1");
}

GM_setValue("foo", "qux");

if (GM_unwatchValue("foo")) {
  GM_log("removed all 'foo' observers");
} else {
  GM_log("unable to remove all 'foo' observers");
}

GM_setValue("foo", "bar");