poly/test/array.html at c47d55e69e9b51498a33bbe367611cf4c1d6d6a4 · cujojs/poly · GitHub

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<!DOCTYPE HTML>
<html lang="en">

<head>
<title>array tests</title>

<script>

curl = {
	baseUrl: '../',
	paths: {
		curl: 'test/curl'
	},
	packages: [
		{ name: 'poly', location: '.', main: 'poly' }
	]
};

</script>

<script src="curl.js"></script>

<script>

var natives = {
	forEach: Array.prototype.forEach,
	map: Array.prototype.map,
	every: Array.prototype.every,
	some: Array.prototype.some,
	indexOf: Array.prototype.indexOf,
	lastIndexOf: Array.prototype.lastIndexOf,
	reduce: Array.prototype.reduce,
	reduceRight: Array.prototype.reduceRight
};

// First, test that poly/array doesn't clobber native methods
curl(['test/testutils', 'poly/array', 'domReady!'], function (tester) {

	var test = [];
	// Note: these tests won't run in evirons that don't support .forEach()
	if (natives.forEach) {
		for (var m in natives) {
			tester.assertTrue('shim doesn\'t clobber ' + m, function () { return test[m] == natives[m]; });
		}
	}

}).next(['curl/_privileged'], function (priv) {

	// remove poly/array from cache
	delete priv.cache['poly/array'];
	// For testing in an ES env, remove shimmed methods first
	Array.prototype.forEach = null;
	Array.prototype.map = null;
	Array.prototype.every = null;
	Array.prototype.some = null;
	Array.prototype.indexOf = null;
	Array.prototype.lastIndexOf = null;
	Array.prototype.reduce = null;
	Array.prototype.reduceRight = null;
	delete Array.isArray;

}).next(['test/testutils', 'poly/array'], runTests);

	function runTests (tester) {

		var methodNames, testArray;

		methodNames = {
			forEach: 1,
			map: 1,
			every: 1,
			some: 1,
			indexOf: 1,
			lastIndexOf: 1,
			reduce: 1,
			reduceRight: 1
		};

		testArray = [
			0, 1, 2, 3,
			"four",
			{ five: 'five' },
			0,
			"seven"
		];

		// check for existence of array prototype methods
		for (var m in methodNames) {
			tester.assertTrue(m + ' exists', function () {
				return typeof [][m] == 'function';
			});
		}

		// test some/every
		// some/every helper
		function isGreaterThanFive(a) {
			return a > 5;
		}
		tester.assertEquals('some handles empty array', function() {
			return [].some(isGreaterThanFive);
		}, false);

		tester.assertEquals('some hits nothing', function() {
			return [1, 2, 3].some(isGreaterThanFive);
		}, false);

		tester.assertEquals('some hits some items', function() {
			return [1, 2, 7].some(isGreaterThanFive);
		}, true);

		tester.assertEquals('some hits all items', function() {
			return [6, 7, 8].some(isGreaterThanFive);
		}, true);

		tester.assertEquals('every handles empty array', function() {
			return [].every(isGreaterThanFive);
		}, true);

		tester.assertEquals('every hits nothing', function() {
			return [1, 2, 3].every(isGreaterThanFive);
		}, false);

		tester.assertEquals('every hits some items', function() {
			return [1, 2, 7].every(isGreaterThanFive);
		}, false);

		tester.assertEquals('every hits all items', function() {
			return [6, 7, 8].every(isGreaterThanFive);
		}, true);

		// test forEach
		tester.assertTrue('forEach hits all items', function () {
			var expected, sum;
			expected = 0;
			sum = 0;
			testArray.forEach(function (item, i) {
				sum += i;
			});

			for (var i = 0; i < testArray.length; i++) {
				expected += i;
			}

			return expected === sum;
		});
		tester.assertTrue('forEach applies context correctly', function () {
			var context = { sum: 0 };
			testArray.forEach(function (item, i) {
				this.sum++;
			}, context);
			return context.sum == 8;
		});

		// test map and filter
		tester.assertTrue('map skips missing items in "sparse array"', function () {
			var obj = {};
			testArray.forEach(function (item, i) {
				obj[i] = item;
			});
			delete obj[6];
			obj.length = testArray.length;
			return [].map.call(obj, function (item) {
				return item.toString();
			})[6] === undefined;
		});
		tester.assertTrue('map processes all values', function () {
			var strings = testArray.map(function (item) {
				return item.toString();
			});
			return strings.every(function (item) {
				return typeof item == 'string';
			});
		});
		tester.assertEquals('filter removes items', function () {
			var filtered = testArray.filter(function (item) {
				return typeof item == 'number';
			});
			return filtered.length;
		}, 5);

		//
		// reduce tests
		//

		// reduce helper
		function sum(a, b) {
			return a + b;
		}

		function sub(a, b) {
			return a - b;
		}

		// tests
		tester.assertEquals('reduce handles valid input', function() {
			return [1,1,1].reduce(sum);
		}, 3);
		tester.assertEquals('reduce is left to right', function() {
			return [3,2,1].reduce(sub);
		}, 0);
		tester.assertEquals('reduce handles valid input with initial value', function() {
			return [1,1,1].reduce(sum, 1);
		}, 4);
		tester.assertEquals('reduce handles sparse arrays', function() {
			return [,1,,1,1].reduce(sum);
		}, 3);
		tester.assertEquals('reduce returns initial value for empty array', function() {
			return [].reduce(sum, 1);
		}, 1);
		tester.assertTrue('reduce throws TypeError for empty array and no initial value', function() {
			try {
				[].reduce(sum);
				return false;
			} catch(e) {
				return e instanceof TypeError;
			}
		});

		// tests
		tester.assertEquals('reduceRight handles valid input', function() {
			return [1,1,1].reduceRight(sum);
		}, 3);
		tester.assertEquals('reduceRight is right to left', function() {
			return [1,2,3].reduceRight(sub);
		}, 0);
		tester.assertEquals('reduceRight handles valid input with initial value', function() {
			return [1,1,1].reduceRight(sum, 1);
		}, 4);
		tester.assertEquals('reduceRight handles sparse arrays', function() {
			return [,1,,1,1].reduceRight(sum);
		}, 3);
		tester.assertEquals('reduceRight returns initial value for empty array', function() {
			return [].reduceRight(sum, 1);
		}, 1);
		tester.assertTrue('reduceRight throws TypeError for empty array and no initial value', function() {
			try {
				[].reduceRight(sum);
				return false;
			} catch(e) {
				return e instanceof TypeError;
			}
		});

		// indexOf and lastIndexOf tests
		tester.assertEquals('indexOf finds item in first position', function () {
			return testArray.indexOf(0);
		}, 0);
		tester.assertEquals('indexOf finds item in last position', function () {
			return testArray.indexOf('seven');
		}, 7);
		tester.assertEquals('indexOf finds item from index', function () {
			return testArray.indexOf(0, 3);
		}, 6);
		tester.assertEquals('lastIndexOf finds item in first position', function () {
			return testArray.lastIndexOf(0);
		}, 6);
		tester.assertEquals('lastIndexOf finds item in last position', function () {
			return testArray.lastIndexOf('seven');
		}, 7);
		tester.assertEquals('lastIndexOf finds item from index', function () {
			return testArray.lastIndexOf(0, 3);
		}, 0);

		// test isArray
		tester.assertTrue('Array.isArray on an array is true', function () {
			return Array.isArray(testArray);
		});
		tester.assertFalse('Array.isArray on a string is false', function () {
			return Array.isArray('foo');
		});
		tester.assertFalse('Array.isArray on an array-like object is false', function () {
			var alo = {};
			alo.length = 1;
			alo['1'] = 1;
			return Array.isArray(alo);
		});

		// test generics on array-like objects
		tester.assertEquals('Array methods should apply correctly to strings', function () {
			try {
				return [].reduce.call('abcdefg', function (val, ch) { return val + 1; }, 0);
			}
			catch (ex) {
				return ex.message;
			}
		}, 7);
		tester.assertEquals('Array methods should apply correctly to array-like objects', function () {
			// create a sparse array-like object that reduces to 7
			var alo = {};
			alo.length = 13;
			alo[1] = alo[3] = alo[4] = alo[7] = alo[8] = alo[9] = alo[10] = 1;
			try {
				return [].reduce.call(alo, function (val, one) { return val + one; }, 0);
			}
			catch (ex) {
				return ex.message;
			}
		}, 7);
		tester.assertEquals('// Array methods should not skip over undefined items in array (fails in IE)', function () {
			// create a normal array with undefined items
			// reduce should count every item
			var arr = [1, void 0, 1, void 0, 1];
			try {
				return arr.reduce(function (val, num) {
					return val + 1;
				}, 0);
			}
			catch (ex) {
				return ex.message;
			}
		}, 5);

//		// these won't run correctly on most browsers since .call(null) implies .call(window)
//		tester.assertTrue('Array methods should throw TypeError when applied to null', function () {
//			try {
//				[].forEach.call(null, function (ch) {});
//				return false;
//			}
//			catch (ex) {
//				return ex instanceof TypeError;
//			}
//		});
//		tester.assertTrue('Array methods should throw TypeError when applied to undefined', function () {
//			try {
//				[].forEach.call(void 0, function (ch) {});
//				return false;
//			}
//			catch (ex) {
//				return ex instanceof TypeError;
//			}
//		});

	}

</script>

</head>

<body>

<div id="output"></div>

</body>
</html>