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test_array_includes_regression_big.cjs
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test_array_includes_regression_big.cjs
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const assert = require("node:assert");
function assertArrayIncludesRegressionSurface() {
assert.strictEqual([1, 2, 3].includes(2), true);
assert.strictEqual([1, 2, 3].includes(4), false);
assert.strictEqual([1, 2, 3].includes(1, 1), false);
assert.strictEqual([NaN].includes(NaN), true);
assert.strictEqual([1, 2, 3].includes(3, -1), true);
assert.strictEqual([1, 2, 3].includes(1, -1), false);
assert.strictEqual([,].includes(undefined), true);
assert.strictEqual(Array(4).includes(undefined), true);
assert.strictEqual(Array(4).includes(1), false);
const holey = [];
holey[3] = "tail";
assert.strictEqual(holey.includes(undefined), true);
assert.strictEqual(holey.includes("tail"), true);
assert.strictEqual(holey.includes("tail", 4), false);
const grown = [1];
grown.length = 3;
assert.strictEqual(grown.includes(undefined), true);
try {
Array.prototype[1] = "from-array-proto";
assert.strictEqual(Array(3).includes("from-array-proto"), true);
assert.strictEqual(Array(3).includes("missing"), false);
} finally {
delete Array.prototype[1];
}
const customIncludes = {
includes(value) {
return value === "custom";
}
};
assert.strictEqual(customIncludes.includes("custom"), true);
const originalIncludes = Array.prototype.includes;
try {
Array.prototype.includes = function(value) {
return value === "patched";
};
assert.strictEqual([1, 2, 3].includes("patched"), true);
} finally {
Array.prototype.includes = originalIncludes;
}
let steps = 0;
const generic = {
get length() {
steps += 1;
return 6;
},
get 2() {
steps += 10;
return "match";
},
get 4() {
steps += 100;
return "late";
}
};
assert.strictEqual([].includes.call(generic, "match", 1), true);
assert.strictEqual(steps, 11);
const proto = { 3: "from-proto" };
const inherited = Object.create(proto);
Object.defineProperty(inherited, "length", {
configurable: true,
enumerable: true,
get() {
return 5;
}
});
assert.strictEqual([].includes.call(inherited, "from-proto"), true);
assert.strictEqual([].includes.call(inherited, undefined), true);
const proxyLog = [];
const proxy = new Proxy(
{ length: 4, 0: NaN, 1: "", 2: NaN, 3: "" },
{
get(target, key) {
proxyLog.push(String(key));
return target[key];
}
}
);
assert.strictEqual(Array.prototype.includes.call(proxy, NaN, 1), true);
assert.deepStrictEqual(proxyLog, ["length", "1", "2"]);
[
Int8Array,
Uint8Array,
Uint8ClampedArray,
Int16Array,
Uint16Array,
Int32Array,
Uint32Array,
Float32Array,
Float64Array
].forEach((TypedArray) => {
const view = new TypedArray([1, 2, 3]);
assert.strictEqual(view.includes(1), true);
assert.strictEqual(view.includes(4), false);
assert.strictEqual(view.includes(1, 1), false);
});
const floatView = new Float64Array([1, NaN, 3]);
assert.strictEqual(floatView.includes(NaN), true);
}
assertArrayIncludesRegressionSurface();
console.log("array includes regression surface passes");

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