goja/builtin_arrray_test.go

package goja

import "testing"

func TestArrayProtoProp(t *testing.T) {
	const SCRIPT = `
	Object.defineProperty(Array.prototype, '0', {value: 42, configurable: true, writable: false})
	var a = []
	a[0] = 1
	a[0]
	`

	testScript1(SCRIPT, valueInt(42), t)
}

func TestArrayDelete(t *testing.T) {
	const SCRIPT = `
	var a = [1, 2];
	var deleted = delete a[0];
	var undef = a[0] === undefined;
	var len = a.length;

	deleted && undef && len === 2;
	`

	testScript1(SCRIPT, valueTrue, t)
}

func TestArrayDeleteNonexisting(t *testing.T) {
	const SCRIPT = `
	Array.prototype[0] = 42;
	var a = [];
	delete a[0] && a[0] === 42;
	`

	testScript1(SCRIPT, valueTrue, t)
}

func TestArraySetLength(t *testing.T) {
	const SCRIPT = `
	var a = [1, 2];
	var assert0 = a.length == 2;
	a.length = "1";
	a.length = 1.0;
	a.length = 1;
	var assert1 = a.length == 1;
	a.length = 2;
	var assert2 = a.length == 2;
	assert0 && assert1 && assert2 && a[1] === undefined;

	`

	testScript1(SCRIPT, valueTrue, t)
}

func TestArrayReverseNonOptimisable(t *testing.T) {
	const SCRIPT = `
	var a = [];
	Object.defineProperty(a, "0", {get: function() {return 42}, set: function(v) {Object.defineProperty(a, "0", {value: v + 1, writable: true, configurable: true})}, configurable: true})
	a[1] = 43;
	a.reverse();

	a.length === 2 && a[0] === 44 && a[1] === 42;
	`

	testScript1(SCRIPT, valueTrue, t)
}

func TestArrayPushNonOptimisable(t *testing.T) {
	const SCRIPT = `
	Object.defineProperty(Object.prototype, "0", {value: 42});
	var a = [];
	var thrown = false;
	try {
		a.push(1);
	} catch (e) {
		thrown = e instanceof TypeError;
	}
	thrown;
	`

	testScript1(SCRIPT, valueTrue, t)
}

func TestArraySetLengthWithPropItems(t *testing.T) {
	const SCRIPT = `
	var a = [1,2,3,4];
	var thrown = false;

	Object.defineProperty(a, "2", {value: 42, configurable: false, writable: false});
	try {
		Object.defineProperty(a, "length", {value: 0, writable: false});
	} catch (e) {
		thrown = e instanceof TypeError;
	}
	thrown && a.length === 3;
	`

	testScript1(SCRIPT, valueTrue, t)
}

func TestArrayFrom(t *testing.T) {
	const SCRIPT = `
	function checkDestHoles(dest, prefix) {
		assert(dest !== source, prefix + ": dest !== source");
		assert.sameValue(dest.length, 3, prefix + ": dest.length");
		assert.sameValue(dest[0], 1, prefix + ": [0]");
		assert.sameValue(dest[1], undefined, prefix + ": [1]");
		assert(dest.hasOwnProperty("1"), prefix + ': hasOwnProperty("1")');
		assert.sameValue(dest[2], 3, prefix + ": [2]");
	}

	function checkDest(dest, prefix) {
		assert(dest !== source, prefix + ": dest !== source");
		assert.sameValue(dest.length, 3, prefix + ": dest.length");
		assert.sameValue(dest[0], 1, prefix + ": [0]");
		assert.sameValue(dest[1], 2, prefix + ": [1]");
		assert.sameValue(dest[2], 3, prefix + ": [2]");
	}

	var source = [1,2,3];
	var srcHoles = [1,,3];

	checkDest(Array.from(source), "std source/std dest");
	checkDestHoles(Array.from(srcHoles), "std source (holes)/std dest");

	function Iter() {
		this.idx = 0;
	}
	Iter.prototype.next = function() {
		if (this.idx < source.length) {
			return {value: source[this.idx++]};
		} else {
			return {done: true};
		}
	}

	var src = {};
	src[Symbol.iterator] = function() {
		return new Iter();
	}
	checkDest(Array.from(src), "iter src/std dest");

	src = {0: 1, 2: 3, length: 3};
	checkDestHoles(Array.from(src), "arrayLike src/std dest");

	function A() {}
	A.from = Array.from;

	checkDest(A.from(source), "std src/cust dest");
	checkDestHoles(A.from(srcHoles), "std src (holes)/cust dest");
	checkDestHoles(A.from(src), "arrayLike src/cust dest");

	function T2() {
	  Object.defineProperty(this, 0, {
		configurable: false,
		writable: true,
		enumerable: true
	  });
	}

	assert.throws(TypeError, function() {
		Array.from.call(T2, source);
	});

	`

	testScript1(TESTLIB+SCRIPT, _undefined, t)
}

func TestArrayOf(t *testing.T) {
	const SCRIPT = `
	function T1() {
	  Object.preventExtensions(this);
	}
	
	assert.throws(TypeError, function() {
	  Array.of.call(T1, 'Bob');
	});

	function T2() {
	  Object.defineProperty(this, 0, {
		configurable: false,
		writable: true,
		enumerable: true
	  });
	}
	
	assert.throws(TypeError, function() {
	  Array.of.call(T2, 'Bob');
	})

	result = Array.of.call(undefined);
	assert(
	  result instanceof Array,
	  'this is not a constructor'
	);

	result = Array.of.call(Math.cos);
	assert(
	  result instanceof Array,
	  'this is a builtin function with no [[Construct]] slot'
	);

	`

	testScript1(TESTLIB+SCRIPT, _undefined, t)
}

func TestUnscopables(t *testing.T) {
	const SCRIPT = `
	var keys = [];
	var _length;
	with (Array.prototype) {
		_length = length;
		keys.push('something');
	}
	_length === 0 && keys.length === 1 && keys[0] === "something";
	`
	testScript1(SCRIPT, valueTrue, t)
}

func TestArraySort(t *testing.T) {
	const SCRIPT = `
	assert.throws(TypeError, function() {
		[1,2].sort(null);
	}, "null compare function");
	assert.throws(TypeError, function() {
		[1,2].sort({});
	}, "non-callable compare function");
	`
	testScript1(TESTLIB+SCRIPT, _undefined, t)
}

func TestArraySortNonStdArray(t *testing.T) {
	const SCRIPT = `
	const array = [undefined, 'c', /*hole*/, 'b', undefined, /*hole*/, 'a', 'd'];

	Object.defineProperty(array, '2', {
	  get() {
		array.pop();
		array.pop();
		return this.foo;
	  },
	  set(v) {
		this.foo = v;
	  }
	});

	array.sort();

	assert.sameValue(array[0], 'b');
	assert.sameValue(array[1], 'c');
	assert.sameValue(array[3], undefined);
	assert.sameValue(array[4], undefined);
	assert.sameValue('5' in array, false);
	assert.sameValue(array.hasOwnProperty('5'), false);
	assert.sameValue(array.length, 6);
	assert.sameValue(array.foo, undefined);

	assert.sameValue(array[2], undefined);
	assert.sameValue(array.length, 4);
	`
	testScript1(TESTLIB+SCRIPT, _undefined, t)
}

func TestArrayConcat(t *testing.T) {
	const SCRIPT = `
	var concat = Array.prototype.concat;
	var array = [1, 2];
	var sparseArray = [1, , 2];
	var nonSpreadableArray = [1, 2];
	nonSpreadableArray[Symbol.isConcatSpreadable] = false;
	var arrayLike = { 0: 1, 1: 2, length: 2 };
	var spreadableArrayLike = { 0: 1, 1: 2, length: 2 };
	spreadableArrayLike[Symbol.isConcatSpreadable] = true;
	assert(looksNative(concat));
	assert(deepEqual(array.concat(), [1, 2]), '#1');
	assert(deepEqual(sparseArray.concat(), [1, , 2]), '#2');
	assert(deepEqual(nonSpreadableArray.concat(), [[1, 2]]), '#3');
	assert(deepEqual(concat.call(arrayLike), [{ 0: 1, 1: 2, length: 2 }]), '#4');
	assert(deepEqual(concat.call(spreadableArrayLike), [1, 2]), '#5');
	assert(deepEqual([].concat(array), [1, 2]), '#6');
	assert(deepEqual([].concat(sparseArray), [1, , 2]), '#7');
	assert(deepEqual([].concat(nonSpreadableArray), [[1, 2]]), '#8');
	assert(deepEqual([].concat(arrayLike), [{ 0: 1, 1: 2, length: 2 }]), '#9');
	assert(deepEqual([].concat(spreadableArrayLike), [1, 2]), '#10');
	assert(deepEqual(array.concat(sparseArray, nonSpreadableArray, arrayLike, spreadableArrayLike), [
	1, 2, 1, , 2, [1, 2], { 0: 1, 1: 2, length: 2 }, 1, 2,
	]), '#11');
	array = [];
	array.constructor = {};
	array.constructor[Symbol.species] = function () {
		return { foo: 1 };
	}
	assert.sameValue(array.concat().foo, 1, '@@species');
	`
	testScript1(TESTLIBX+SCRIPT, _undefined, t)
}

func TestArrayFlat(t *testing.T) {
	const SCRIPT = `
	var array = [1, [2,3,[4,5,6]], [[[[7,8,9]]]]];
	assert(deepEqual(array.flat(), [1,2,3,[4,5,6],[[[7,8,9]]]]), '#1');
	assert(deepEqual(array.flat(1), [1,2,3,[4,5,6],[[[7,8,9]]]]), '#2');
	assert(deepEqual(array.flat(3), [1,2,3,4,5,6,[7,8,9]]), '#3');
	assert(deepEqual(array.flat(4), [1,2,3,4,5,6,7,8,9]), '#4');
	assert(deepEqual(array.flat(10), [1,2,3,4,5,6,7,8,9]), '#5');
	`
	testScript1(TESTLIBX+SCRIPT, _undefined, t)
}

func TestArrayFlatMap(t *testing.T) {
	const SCRIPT = `
	var double = function(x) {
		if (isNaN(x)) {
			return x
		}
		return x * 2
	}
	var array = [1, [2,3,[4,5,6]], [[[[7,8,9]]]]];
	assert(deepEqual(array.flatMap(double), [2,2,3,[4,5,6],[[[7,8,9]]]]), '#1');
	`
	testScript1(TESTLIBX+SCRIPT, _undefined, t)
}