The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/services/sync/tests/unit/test_utils_lock.js	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,75 @@
     1.4 +_("Make sure lock prevents calling with a shared lock");
     1.5 +Cu.import("resource://services-sync/util.js");
     1.6 +
     1.7 +// Utility that we only use here.
     1.8 +
     1.9 +function do_check_begins(thing, startsWith) {
    1.10 +  if (!(thing && thing.indexOf && (thing.indexOf(startsWith) == 0)))
    1.11 +    do_throw(thing + " doesn't begin with " + startsWith);
    1.12 +}
    1.13 +
    1.14 +function run_test() {
    1.15 +  let ret, rightThis, didCall;
    1.16 +  let state, lockState, lockedState, unlockState;
    1.17 +  let obj = {
    1.18 +    _lock: Utils.lock,
    1.19 +    lock: function() {
    1.20 +      lockState = ++state;
    1.21 +      if (this._locked) {
    1.22 +        lockedState = ++state;
    1.23 +        return false;
    1.24 +      }
    1.25 +      this._locked = true;
    1.26 +      return true;
    1.27 +    },
    1.28 +    unlock: function() {
    1.29 +      unlockState = ++state;
    1.30 +      this._locked = false;
    1.31 +    },
    1.32 +
    1.33 +    func: function() this._lock("Test utils lock",
    1.34 +    function() {
    1.35 +      rightThis = this == obj;
    1.36 +      didCall = true;
    1.37 +      return 5;
    1.38 +    })(),
    1.39 +
    1.40 +    throwy: function() this._lock("Test utils lock throwy",
    1.41 +    function() {
    1.42 +      rightThis = this == obj;
    1.43 +      didCall = true;
    1.44 +      this.throwy();
    1.45 +    })()
    1.46 +  };
    1.47 +
    1.48 +  _("Make sure a normal call will call and return");
    1.49 +  rightThis = didCall = false;
    1.50 +  state = 0;
    1.51 +  ret = obj.func();
    1.52 +  do_check_eq(ret, 5);
    1.53 +  do_check_true(rightThis);
    1.54 +  do_check_true(didCall);
    1.55 +  do_check_eq(lockState, 1);
    1.56 +  do_check_eq(unlockState, 2);
    1.57 +  do_check_eq(state, 2);
    1.58 +
    1.59 +  _("Make sure code that calls locked code throws");
    1.60 +  ret = null;
    1.61 +  rightThis = didCall = false;
    1.62 +  try {
    1.63 +    ret = obj.throwy();
    1.64 +    do_throw("throwy internal call should have thrown!");
    1.65 +  }
    1.66 +  catch(ex) {
    1.67 +    // Should throw an Error, not a string.
    1.68 +    do_check_begins(ex, "Could not acquire lock");
    1.69 +  }
    1.70 +  do_check_eq(ret, null);
    1.71 +  do_check_true(rightThis);
    1.72 +  do_check_true(didCall);
    1.73 +  _("Lock should be called twice so state 3 is skipped");
    1.74 +  do_check_eq(lockState, 4);
    1.75 +  do_check_eq(lockedState, 5);
    1.76 +  do_check_eq(unlockState, 6);
    1.77 +  do_check_eq(state, 6);
    1.78 +}