tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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test_defineESModuleGetters.js (2125B)

      1 function assertAccessor(lazy, name) {
      2  let desc = Object.getOwnPropertyDescriptor(lazy, name);
      3  Assert.equal(typeof desc.get, "function");
      4  Assert.equal(desc.get.name, name);
      5  Assert.equal(typeof desc.set, "function");
      6  Assert.equal(desc.set.name, name);
      7  Assert.equal(desc.enumerable, true);
      8  Assert.equal(desc.configurable, true);
      9 }
     10 
     11 function assertDataProperty(lazy, name, value) {
     12  let desc = Object.getOwnPropertyDescriptor(lazy, name);
     13  Assert.equal(desc.value, value);
     14  Assert.equal(desc.writable, true);
     15  Assert.equal(desc.enumerable, true);
     16  Assert.equal(desc.configurable, true);
     17 }
     18 
     19 add_task(function test_getter() {
     20  // The property should be defined as getter, and getting it should make it
     21  // a data property.
     22 
     23  const lazy = {};
     24  ChromeUtils.defineESModuleGetters(lazy, {
     25    X: "resource://test/esm_lazy-1.sys.mjs",
     26  });
     27 
     28  assertAccessor(lazy, "X");
     29 
     30  Assert.equal(lazy.X, 10);
     31  assertDataProperty(lazy, "X", 10);
     32 });
     33 
     34 add_task(function test_setter() {
     35  // Setting the value before the first get should result in a data property.
     36  const lazy = {};
     37  ChromeUtils.defineESModuleGetters(lazy, {
     38    X: "resource://test/esm_lazy-1.sys.mjs",
     39  });
     40 
     41  assertAccessor(lazy, "X");
     42  lazy.X = 20;
     43  Assert.equal(lazy.X, 20);
     44  assertDataProperty(lazy, "X", 20);
     45 
     46  // The above set shouldn't affect the module's value.
     47  const lazy2 = {};
     48  ChromeUtils.defineESModuleGetters(lazy2, {
     49    X: "resource://test/esm_lazy-1.sys.mjs",
     50  });
     51 
     52  Assert.equal(lazy2.X, 10);
     53 });
     54 
     55 add_task(function test_order() {
     56  // The change to the exported value should be reflected until it's accessed.
     57 
     58  const lazy = {};
     59  ChromeUtils.defineESModuleGetters(lazy, {
     60    Y: "resource://test/esm_lazy-2.sys.mjs",
     61    AddY: "resource://test/esm_lazy-2.sys.mjs",
     62  });
     63 
     64  assertAccessor(lazy, "Y");
     65  assertAccessor(lazy, "AddY");
     66 
     67  // The change before getting the value should be reflected.
     68  lazy.AddY(2);
     69  Assert.equal(lazy.Y, 22);
     70  assertDataProperty(lazy, "Y", 22);
     71 
     72  // Change after getting the value shouldn't be reflected.
     73  lazy.AddY(2);
     74  Assert.equal(lazy.Y, 22);
     75  assertDataProperty(lazy, "Y", 22);
     76 });