shim.js
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// Some tests taken from: https://github.com/mathiasbynens/Array.from/blob/master/tests/tests.js
"use strict";
module.exports = function (t, a) {
var o = [1, 2, 3], MyType;
a.not(t(o), o, "Array");
a.deep(t(o), o, "Array: same content");
a.deep(t("12r3v"), ["1", "2", "r", "3", "v"], "String");
a.deep(
t(
(function () {
return arguments;
})(3, o, "raz")
),
[3, o, "raz"],
"Arguments"
);
a.deep(
t(
(function () {
return arguments;
})(3)
),
[3],
"Arguments with one numeric value"
);
a.deep(t({ 0: "raz", 1: "dwa", length: 2 }), ["raz", "dwa"], "Other");
a.deep(
t(
o,
function (val) {
return (val + 2) * 10;
},
10
),
[30, 40, 50],
"Mapping"
);
a.throws(
function () {
t();
},
TypeError,
"Undefined"
);
a.deep(t(3), [], "Primitive");
a(t.length, 1, "Length");
a.deep(t({ length: 0 }), [], "No values Array-like");
a.deep(t({ length: -1 }), [], "Invalid length Array-like");
a.deep(t({ length: -Infinity }), [], "Invalid length Array-like #2");
a.throws(
function () {
t(undefined);
},
TypeError,
"Undefined"
);
a.throws(
function () {
t(null);
},
TypeError,
"Null"
);
a.deep(t(false), [], "Boolean");
a.deep(t(-Infinity), [], "Inifity");
a.deep(t(-0), [], "-0");
a.deep(t(+0), [], "+0");
a.deep(t(1), [], "1");
a.deep(t(Number(Infinity)), [], "+Infinity");
a.deep(t({}), [], "Plain object");
a.deep(t({ length: 1 }), [undefined], "Sparse array-like");
a.deep(
t({ 0: "a", 1: "b", length: 2 }, function (x) {
return x + x;
}),
["aa", "bb"],
"Map"
);
a.deep(
t(
{ 0: "a", 1: "b", length: 2 },
function () {
return String(this);
},
undefined
),
["undefined", "undefined"],
"Map context"
);
a.deep(
t(
{ 0: "a", 1: "b", length: 2 },
function () {
return String(this);
},
"x"
),
["x", "x"],
"Map primitive context"
);
a.throws(
function () {
t({}, "foo", "x");
},
TypeError,
"Non callable for map"
);
a.deep(t({ length: 1, 0: "a" }), ["a"], "Null context");
a(t({ __proto__: { 0: "abc", length: 1 } })[0], "abc", "Values on prototype");
a.throws(
function () {
t.call(function () {
return Object.freeze({});
}, {});
},
TypeError,
"Contructor producing freezed objects"
);
// Ensure no setters are called for the indexes
// Ensure no setters are called for the indexes
MyType = function () {};
Object.defineProperty(MyType.prototype, "0", {
set: function (x) {
throw new Error("Setter called: " + x);
}
});
a.deep(t.call(MyType, { 0: "abc", length: 1 }), { 0: "abc", length: 1 }, "Defined not set");
};