test_chromeutils_defineLazyGetter.js

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"use strict";

add_task(function test_defineLazyGetter() {

  let accessCount = 0;

  let obj = {

    inScope: false,

};

  const TEST_VALUE = "test value";

  ChromeUtils.defineLazyGetter(obj, "foo", function () {

    accessCount++;

    this.inScope = true;

    return TEST_VALUE;

});

  Assert.equal(accessCount, 0);

  // Get the property, making sure the access count has increased.

  Assert.equal(obj.foo, TEST_VALUE);

  Assert.equal(accessCount, 1);

  Assert.ok(obj.inScope);

  // Get the property once more, making sure the access count has not

  // increased.

  Assert.equal(obj.foo, TEST_VALUE);

  Assert.equal(accessCount, 1);

});