gecko/xpcom/tests/unit/test_home.js

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const Ci = Components.interfaces;
const Cc = Components.classes;
const CWD = do_get_cwd();
function checkOS(os) {
const nsILocalFile_ = "nsILocalFile" + os;
return nsILocalFile_ in Components.interfaces &&
CWD instanceof Components.interfaces[nsILocalFile_];
}
const isWin = checkOS("Win");
function run_test() {
var envVar = isWin ? "USERPROFILE" : "HOME";
var dirSvc = Cc["@mozilla.org/file/directory_service;1"].getService(Ci.nsIProperties);
var homeDir = dirSvc.get("Home", Ci.nsIFile);
var env = Cc["@mozilla.org/process/environment;1"].getService(Ci.nsIEnvironment);
var expected = Cc["@mozilla.org/file/local;1"].createInstance(Ci.nsILocalFile);
expected.initWithPath(env.get(envVar));
do_check_eq(homeDir.path, expected.path);
}