The Tor Browser: services/sync/tests/unit/test_utils

     1 _("Make sure lock prevents calling with a shared lock");

     2 Cu.import("resource://services-sync/util.js");

     4 // Utility that we only use here.

     6 function do_check_begins(thing, startsWith) {

     7   if (!(thing && thing.indexOf && (thing.indexOf(startsWith) == 0)))

     8     do_throw(thing + " doesn't begin with " + startsWith);

9 }

    11 function run_test() {

    12   let ret, rightThis, didCall;

    13   let state, lockState, lockedState, unlockState;

    14   let obj = {

    15     _lock: Utils.lock,

    16     lock: function() {

    17       lockState = ++state;

    18       if (this._locked) {

    19         lockedState = ++state;

    20         return false;

    21       }

    22       this._locked = true;

    23       return true;

    24     },

    25     unlock: function() {

    26       unlockState = ++state;

    27       this._locked = false;

    28     },

    30     func: function() this._lock("Test utils lock",

    31     function() {

    32       rightThis = this == obj;

    33       didCall = true;

    34       return 5;

    35     })(),

    37     throwy: function() this._lock("Test utils lock throwy",

    38     function() {

    39       rightThis = this == obj;

    40       didCall = true;

    41       this.throwy();

    42     })()

    43   };

    45   _("Make sure a normal call will call and return");

    46   rightThis = didCall = false;

    47   state = 0;

    48   ret = obj.func();

    49   do_check_eq(ret, 5);

    50   do_check_true(rightThis);

    51   do_check_true(didCall);

    52   do_check_eq(lockState, 1);

    53   do_check_eq(unlockState, 2);

    54   do_check_eq(state, 2);

    56   _("Make sure code that calls locked code throws");

    57   ret = null;

    58   rightThis = didCall = false;

    59   try {

    60     ret = obj.throwy();

    61     do_throw("throwy internal call should have thrown!");

    62   }

    63   catch(ex) {

    64     // Should throw an Error, not a string.

    65     do_check_begins(ex, "Could not acquire lock");

    66   }

    67   do_check_eq(ret, null);

    68   do_check_true(rightThis);

    69   do_check_true(didCall);

    70   _("Lock should be called twice so state 3 is skipped");

    71   do_check_eq(lockState, 4);

    72   do_check_eq(lockedState, 5);

    73   do_check_eq(unlockState, 6);

    74   do_check_eq(state, 6);

    75 }

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