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<!doctype html>
<title>Array.prototype.join</title>
<link rel=author href=mailto:Ms2ger@gmail.com title=Ms2ger>
<link rel=help href=http://es5.github.com/#x15.4.4.5>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<div id=log></div>
<script>
var test_error = { name: "test" };
// Step 1.
test(function() {
assert_throws(new TypeError(), function() {
[].join.call(null, {
toString: function() { assert_unreached(); }
});
});
assert_throws(new TypeError(), function() {
[].join.call(undefined, {
toString: function() { assert_unreached(); }
});
});
}, "Array.prototype.join must call ToObject before looking at the separator argument.")
var generateTest = function(throwing_getter, getter_name) {
var throwing_object = {};
var interfaces = [Boolean, Number];
var objects = interfaces.map(function(p) { return p.prototype; });
objects.push(throwing_object);
objects.forEach(function(object) {
Object.defineProperty(object, "length", {
get: throwing_getter,
configurable: true
});
});
[throwing_object, true, false, 0, 1, Math.PI].forEach(function(that) {
test(function() {
assert_throws(test_error, function() {
[].join.call(that, ",");
});
}, "Array.prototype.join must forward the exception from the this " +
"object's length property with this=" + format_value(that) + " and " +
"getter " + getter_name + ".")
test(function() {
assert_throws(test_error, function() {
[].join.call(that, {
toString: function() { assert_unreached(); }
});
});
}, "Array.prototype.join must get the this object's length property " +
"before looking at the separator argument with this=" +
format_value(that) + " and getter " + getter_name + ".")
});
interfaces.forEach(function(iface) {
delete iface.length;
});
}
// Step 2.
test(function() {
generateTest(function() { throw test_error; }, "function");
}, "Step 2.");
// Step 3.
test(function() {
generateTest(function() {
return {
valueOf: function() { throw test_error; }
};
}, "valueOf");
generateTest(function() {
return {
toString: function() { throw test_error; }
};
}, "toString");
generateTest(function() {
return {
valueOf: function() { throw test_error; },
toString: function() { assert_unreached("toString should not be invoked if valueOf exists"); }
};
}, "valueOf and toString");
}, "Step 3.");
</script>
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