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37 lines
1.0 KiB
JavaScript
37 lines
1.0 KiB
JavaScript
_("Make sure lazy2 function calling/assignment works");
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Cu.import("resource://services-sync/util.js");
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function run_test() {
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let count = 0;
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let Foo = function() {
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return ++count;
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}
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_("Make a thing instance of Foo but make sure it isn't initialized yet");
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let obj = {};
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Utils.lazy2(obj, "thing", Foo);
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do_check_eq(count, 0);
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_("Access the property to make it evaluates");
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do_check_eq(typeof obj.thing, "number");
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do_check_eq(count, 1);
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do_check_eq(obj.thing, 1);
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_("Additional accesses don't evaluate again (nothing should change");
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do_check_eq(typeof obj.thing, "number");
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do_check_eq(count, 1);
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do_check_eq(obj.thing, 1);
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_("More lazy properties will constrct more");
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do_check_eq(typeof obj.other, "undefined");
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Utils.lazy2(obj, "other", Foo);
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do_check_eq(typeof obj.other, "number");
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do_check_eq(count, 2);
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do_check_eq(obj.other, 2);
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_("Sanity check that the original property didn't change");
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do_check_eq(typeof obj.thing, "number");
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do_check_eq(count, 2);
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do_check_eq(obj.thing, 1);
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}
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