Merge pull request #376 from yanlxu/Array.from

update tests for Array.from

test/built-ins/Array/from/Array.from-descriptor.js

@@ -0,0 +1,13 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Testing descriptor property of Array.from
+includes:
+    - propertyHelper.js
+es6id: 22.1.2.1
+---*/
+
+verifyWritable(Array, "from");
+verifyNotEnumerable(Array, "from");
+verifyConfigurable(Array, "from");

test/built-ins/Array/from/Array.from-name.js

@@ -0,0 +1,30 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+/*---
+es6id: 22.1.2.1
+description: '`name` property'
+info: >
+    ES6 Section 17:
+
+    Every built-in Function object, including constructors, that is not
+    identified as an anonymous function has a name property whose value is a
+    String. Unless otherwise specified, this value is the name that is given to
+    the function in this specification.
+
+    [...]
+
+    Unless otherwise specified, the name property of a built-in Function
+    object, if it exists, has the attributes { [[Writable]]: false,
+    [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(
+  Array.from.name,
+  'from',
+  'The value of `Array.from.name` is `"from"`'
+);
+
+verifyNotEnumerable(Array.from, 'name');
+verifyNotWritable(Array.from, 'name');
+verifyConfigurable(Array.from, 'name');

test/built-ins/Array/from/Array.from_arity.js

@@ -4,9 +4,20 @@
 /*---
 es6id: 22.1.2.1
 description: >
-    The Array.from() method creates a new Array instance
+    The length property of the Array.from method is 1.
-    from an array-like or iterable object.
+
-    https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/from
+info: >
+
+    ES6 Section 17:
+
+    Unless otherwise specified, the length property of a built-in Function
+    object has the attributes { [[Writable]]: false, [[Enumerable]]: false,
+    [[Configurable]]: true }.
+includes: [propertyHelper.js]
 ---*/
 
 assert.sameValue(Array.from.length, 1);
+
+verifyNotEnumerable(Array.from, 'length');
+verifyNotWritable(Array.from, 'length');
+verifyConfigurable(Array.from, 'length');

test/built-ins/Array/from/argument-passed-null.js

@@ -0,0 +1,9 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: this argument is passed as null
+es6id: 22.1.2.1
+---*/
+
+assert.throws(TypeError, function(){Array.from.call(null);});

test/built-ins/Array/from/calling-from-valid-1-noStrict.js

@@ -0,0 +1,25 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Calling from with a valid map function without thisArg use noStrict
+es6id: 22.1.2.1
+flags: [noStrict]
+---*/
+
+var array = [ 0, 1, -2, 4, -8, 16 ];
+var arrayIndex = -1;
+var globalThis = this;
+function mapFn(value, k) {
+
+    arrayIndex++;
+    assert.sameValue(value, array[arrayIndex], "From mapFn Element mismatch for index " + arrayIndex + ".");
+    assert.sameValue(k, arrayIndex, "From mapFn index mismatch for " + arrayIndex + ".");
+    assert.sameValue(globalThis, this, "Wrong this value is passed to mapFn for index " + arrayIndex + ".");
+
+    return value;
+}
+var a = Array.from(array, mapFn);
+for (var j = 0; j < array.length; j++) {
+    assert.sameValue(a[j], array[j], "Elements mismatch at " + j + ".");
+}

test/built-ins/Array/from/calling-from-valid-1-onlyStrict.js

@@ -0,0 +1,24 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Calling from with a valid map function without thisArg use onlyStrict
+es6id: 22.1.2.1
+flags: [onlyStrict]
+---*/
+
+var array = [ 0, 1, -2, 4, -8, 16 ];
+var arrayIndex = -1;
+
+function mapFn(value, k) {
+
+    arrayIndex++;
+    assert.sameValue(value, array[arrayIndex], "From mapFn Element mismatch for index " + arrayIndex + ".");
+    assert.sameValue(k, arrayIndex, "From mapFn index mismatch for " + arrayIndex + ".");
+
+    return value;
+}
+var a = Array.from(array, mapFn);
+for (var j = 0; j < array.length; j++) {
+    assert.sameValue(a[j], array[j], "Elements mismatch at " + j + ".");
+}

test/built-ins/Array/from/calling-from-valid-2.js

@@ -0,0 +1,23 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Calling from with a valid map function with thisArg
+es6id: 22.1.2.1
+---*/
+
+var array = [ 0, 1, -2, 4, -8, 16 ];
+var arrayIndex = -1;
+function mapFn (value, k) {
+
+    arrayIndex++;
+    assert.sameValue(value, array[arrayIndex], "In mapFn element mismatch for index " + arrayIndex + " in the mapFn.");
+    assert.sameValue(k, arrayIndex, "From mapFn index mismatch for " + arrayIndex + ".");
+
+    return value;
+}
+
+var a = Array.from(array, mapFn, this);
+for (var j = 0; j < a.length; j++) {
+    assert.sameValue(a[j], array[j], "Elements mismatch at " + j + ".");
+}

test/built-ins/Array/from/create-typedarray-from.js

@@ -0,0 +1,13 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Create a TypedArray from another TypedArray
+es6id: 22.1.2.1
+---*/
+
+var typedArray = Int32Array.from([1, 2, 4, 8, 16, 32, 64, 128]);
+var a = Array.from(typedArray);
+for (var j = 0; j < typedArray.length; j++) {
+    assert.sameValue(a[j], typedArray[j], "Elements mismatch at " + j + ".");
+}

test/built-ins/Array/from/elements-added-after.js

@@ -0,0 +1,37 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Elements added after the call to from
+es6id: 22.1.2.1
+---*/
+
+var arrayIndex = -1;
+var originalLength = 7;
+var obj = {
+    length: originalLength,
+    0: 2,
+    1: 4,
+    2: 8,
+    3: 16,
+    4: 32,
+    5: 64,
+    6: 128
+};
+var array = [ 2, 4, 8, 16, 32, 64, 128 ];
+function mapFn(value, index) {
+    arrayIndex++;
+    assert.sameValue(value, obj[arrayIndex], "Value mismatch in mapFn at index " + index + ".");
+    assert.sameValue(index, arrayIndex, "Index mismatch in mapFn.");
+    obj[originalLength + arrayIndex] = 2 * arrayIndex + 1;
+
+    return obj[arrayIndex];
+}
+
+
+var a = Array.from(obj, mapFn);
+assert.sameValue(a.length, array.length, "Length mismatch.");
+
+for (var j = 0; j < a.length; j++) {
+    assert.sameValue(a[j], array[j], "Element mismatch for array at index " + j + ".");
+}

test/built-ins/Array/from/elements-deleted-after.js

@@ -0,0 +1,31 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: >
+    Elements deleted after the call started and before visited are not
+    visited
+es6id: 22.1.2.1
+---*/
+
+var originalArray = [ 0, 1, -2, 4, -8, 16 ];
+var array = [ 0, 1, -2, 4, -8, 16 ];
+var a = [];
+var arrayIndex = -1;
+function mapFn(value, index) {
+    this.arrayIndex++;
+    assert.sameValue(value, array[this.arrayIndex], "Value mismatch in mapFn at index " + index + ".");
+    assert.sameValue(index, this.arrayIndex, "Index mismatch in mapFn.");
+
+    array.splice(array.length - 1, 1);
+    return 127;
+}
+
+
+a = Array.from(array, mapFn, this);
+
+assert.sameValue(a.length, originalArray.length / 2, "Length mismatch. Old array : " + (originalArray.length / 2) + ". array : " + a.length + ".");
+
+for (var j = 0; j < originalArray.length / 2; j++) {
+    assert.sameValue(a[j], 127, "Element mismatch for mapped array at index " + j + ".");
+}

test/built-ins/Array/from/elements-updated-after.js

@@ -0,0 +1,26 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Elements are updated after the call to from
+es6id: 22.1.2.1
+---*/
+
+var array = [ 127, 4, 8, 16, 32, 64, 128 ];
+var arrayIndex = -1;
+function mapFn(value, index) {
+    arrayIndex++;
+    if (index + 1 < array.length) {
+        array[index + 1] = 127;
+    }
+    assert.sameValue(value, 127, "Value mismatch in mapFn at index " + index + ".");
+    assert.sameValue(index, arrayIndex, "Index mismatch in mapFn.");
+
+    return value;
+}
+
+var a = Array.from(array, mapFn);
+assert.sameValue(a.length, array.length, "Length mismatch.");
+for (var j = 0; j < a.length; j++) {
+    assert.sameValue(a[j], 127, "Element mismatch for mapped array.");
+}

test/built-ins/Array/from/map-called-passing.js

@@ -0,0 +1,25 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: map is called by passing null for thisArg
+es6id: 22.1.2.1
+---*/
+
+var arrayIndex = -1;
+var array = [ 2, 4, 8, 16, 32, 64, 128 ];
+
+function mapFn(value, index) {
+    arrayIndex++;
+    assert.sameValue(value, array[arrayIndex], "Value mismatch in mapFn at index " + index + ".");
+    assert.sameValue(index, arrayIndex, "Index mismatch in mapFn.");
+
+    return array[arrayIndex];
+}
+
+
+var a = Array.from(array, mapFn, null);
+assert.sameValue(a.length, array.length, "Length mismatch. array : " + a.length + ". Original array : " + array.length + ".");
+for (var j = 0; j < a.length; j++) {
+    assert.sameValue(a[j], array[j], "Element mismatch for mapped array.");
+}

test/built-ins/Array/from/mapfn-attached-array.js

@@ -0,0 +1,25 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: mapFn is attached to the Array itself
+es6id: 22.1.2.1
+---*/
+
+var array = [ 2, 4, 8, 16, 32, 64, 128 ];
+var a = [];
+var i = 0;
+Array.prototype.mapFn = function(value, index) {
+    assert.sameValue(value, array[i], "Value mismatch in mapFn at index " + index + ".");
+    assert.sameValue(index, i, "Index mismatch in mapFn.");
+    i++;
+
+    return 127;
+};
+
+a = Array.from(array, a.mapFn , a);
+assert.sameValue(a.length, array.length, "Length mismatch. array : " + array.length + ". Mapped array : " + a.length + ".");
+
+for (var j = 0; j < a.length; j++) {
+    assert.sameValue(a[j], 127, "Element mismatch for mapped array at index " + j + ".");
+}

test/built-ins/Array/from/mapfn-invalid-typeerror-1.js

@@ -0,0 +1,9 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: mapFn is invalid causes a TypeError
+es6id: 22.1.2.1
+---*/
+
+assert.throws(TypeError, function(){Array.from(null);});

test/built-ins/Array/from/mapfn-invalid-typeerror-2.js

@@ -0,0 +1,11 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: mapFn is invalid causes a TypeError
+es6id: 22.1.2.1
+---*/
+
+var obj = {};
+var array = [ ];
+assert.throws(TypeError, function(){Array.from(array, obj);});

test/built-ins/Array/from/mapfn-returns-non-integer.js

@@ -0,0 +1,29 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: mapFn returns a non-integer
+es6id: 22.1.2.1
+---*/
+
+var array = [ 2, 4, 8, 16, 32, 64, 128 ];
+var arrayIndex = -1;
+function mapFn(value, index) {
+    this.arrayIndex++;
+    assert.sameValue(value, array[this.arrayIndex], "Value mismatch in mapFn at index " + index + ".");
+    assert.sameValue(index, this.arrayIndex, "Index mismatch in mapFn.");
+
+    return {
+        val : 127,
+        get value() {
+            return this.val;
+        }
+    };
+}
+
+
+var a = Array.from(array, mapFn, this);
+assert.sameValue(a.length, array.length, "Length mismatch. array : " + array.length + ". Mapped array : " + a.length + ".");
+for (var j = 0; j < a.length; j++) {
+    assert.sameValue(a[j].value, 127, "Element mismatch for mapped array at index " + j + ".");
+}

test/built-ins/Array/from/mapfn-throws-exception.js

@@ -0,0 +1,14 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: mapFn throws an exception
+es6id: 22.1.2.1
+---*/
+
+var array = [ 2, 4, 8, 16, 32, 64, 128 ];
+function mapFn(value, index, obj) {
+    throw new Test262Error();
+}
+
+assert.throws(Test262Error, function(){Array.from(array, mapFn);});

test/built-ins/Array/from/passing-array-buffer.js

@@ -0,0 +1,13 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Passing array Buffer
+es6id: 22.1.2.1
+---*/
+
+var arrayBuffer = new ArrayBuffer([ 1, 2, 4, 8, 16, 32, 64, 128 ]);
+var a = Array.from(arrayBuffer);
+for (var j = 0; j < a.length; j++) {
+    assert.sameValue(a[j], arrayBuffer[j], "Elements mismatch at " + j + ".");
+}

test/built-ins/Array/from/passing-valid-array.js

@@ -0,0 +1,13 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Passing a valid array
+es6id: 22.1.2.1
+---*/
+
+var array = [ 0, 1, -2, 4, -8, 16 ];
+var a = Array.from(array);
+for (var j = 0; j < a.length; j++) {
+    assert.sameValue(a[j], array[j], "Elements mismatch at " + j + ".");
+}

test/built-ins/Array/from/source-array-boundary.js

@@ -0,0 +1,26 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Source array with boundary values
+es6id: 22.1.2.1
+---*/
+
+var array = [ Number.MAX_VALUE, Number.MIN_VALUE, Number.NaN, Number.NEGATIVE_INFINITY, Number.POSITIVE_INFINITY ];
+var arrayIndex = -1;
+function mapFn(value, index) {
+    this.arrayIndex++;
+    assert.sameValue(value, array[this.arrayIndex], "Value mismatch in mapFn at index " + index + ".");
+    assert.sameValue(index, this.arrayIndex, "Index mismatch in mapFn.");
+
+    return value;
+}
+
+var a = Array.from(array, mapFn, this);
+
+assert.sameValue(a.length, array.length, "Length mismatch.");
+assert.sameValue(a[0], Number.MAX_VALUE, "Element mismatch for mapped array at index 0.");
+assert.sameValue(a[1], Number.MIN_VALUE, "Element mismatch for mapped array at index 1.");
+assert.sameValue(a[2], Number.NaN, "Element mismatch for mapped array at index 2.");
+assert.sameValue(a[3], Number.NEGATIVE_INFINITY, "Element mismatch for mapped array at index 3.");
+assert.sameValue(a[4], Number.POSITIVE_INFINITY, "Element mismatch for mapped array at index 4.");

test/built-ins/Array/from/source-object-constructor.js

@@ -0,0 +1,10 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: >
+    Array.from uses a constructor other than Array.
+es6id: 22.1.2.1
+---*/
+
+assert.sameValue(Array.from.call(Object, []).constructor, Object);

test/built-ins/Array/from/source-object-iterator-1.js

@@ -0,0 +1,28 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Source object has iterator which throws
+es6id: 22.1.2.1
+---*/
+
+var array = [ 2, 4, 8, 16, 32, 64, 128 ];
+var obj = {
+    [Symbol.iterator]() {
+        return {
+            index: 0,
+            next() {
+                throw new Test262Error();
+            },
+            isDone : false,
+            get val() {
+                this.index++;
+                if (this.index > 7) {
+                    this.isDone = true;
+                }
+                return 1 << this.index;
+            }
+        };
+    }
+};
+assert.throws(Test262Error, function(){Array.from(obj);});

test/built-ins/Array/from/source-object-iterator-2.js

@@ -0,0 +1,35 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Source object has iterator
+es6id: 22.1.2.1
+---*/
+
+var array = [ 2, 4, 8, 16, 32, 64, 128 ];
+var obj = {
+    [Symbol.iterator]() {
+        return {
+            index: 0,
+            next() {
+                return {
+                    value: this.val,
+                    done: this.isDone
+                };
+            },
+            isDone : false,
+            get val() {
+                this.index++;
+                if (this.index > 7) {
+                    this.isDone = true;
+                }
+                return 1 << this.index;
+            }
+        };
+    }
+};
+var a = Array.from.call(Object, obj);
+assert.sameValue(typeof a, typeof {}, "The returned type is expected to be object.");
+for (var j = 0; j < a.length; j++) {
+    assert.sameValue(a[j], array[j], "Elements mismatch at " + j + ".");
+}

test/built-ins/Array/from/source-object-length.js

@@ -0,0 +1,24 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: >
+    Source is an object with length property and one item is deleted
+    from the source
+es6id: 22.1.2.1
+---*/
+
+var array = [2, 4, 0, 16];
+var expectedArray = [2, 4, , 16];
+var obj = {
+    length : 4,
+    0 : 2,
+    1 : 4,
+    2 : 0,
+    3 : 16
+};
+delete obj[2];
+var a = Array.from(obj);
+for (var j = 0; j < expectedArray.length; j++) {
+    assert.sameValue(a[j], expectedArray[j], "Elements mismatch at " + j + ".");
+}

test/built-ins/Array/from/source-object-missing.js

@@ -0,0 +1,21 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Source is an object with missing values
+es6id: 22.1.2.1
+---*/
+
+var array = [2, 4, , 16];
+var obj = {
+    length: 4,
+    0: 2,
+    1: 4,
+    3: 16
+};
+
+var a = Array.from.call(Object, obj);
+assert.sameValue(typeof a, "object", "The returned type is expected to be object.");
+for (var j = 0; j < a.length; j++) {
+    assert.sameValue(a[j], array[j], "Elements mismatch at " + j + ".");
+}

test/built-ins/Array/from/source-object-without.js

@@ -0,0 +1,17 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Source is an object without length property
+es6id: 22.1.2.1
+---*/
+
+var obj = {
+    0: 2,
+    1: 4,
+    2: 8,
+    3: 16
+}
+
+var a = Array.from(obj);
+assert.sameValue(a.length, 0, "Expected an array of length 0.");

test/built-ins/Array/from/source-sparse-array-noStirct.js

@@ -0,0 +1,24 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Source is a sparse array use noStrict
+es6id: 22.1.2.1
+flags: [noStrict]
+---*/
+
+var array = [0, 1, -2, 4, -8, , -32, 64, , 256, -512, 1024];
+var globalThis = this;
+var arrayIndex = -1;
+function mapFn(value, k) {
+    arrayIndex++;
+    assert.sameValue(value, array[arrayIndex], "From mapFn Element mismatch for index " + arrayIndex + ".");
+    assert.sameValue(k, arrayIndex, "From mapFn index mismatch for " + arrayIndex + ".");
+    assert.sameValue(globalThis, this, "Wrong this value is passed to mapFn for index " + arrayIndex + ".");
+
+    return value;
+}
+var a = Array.from(array, mapFn);
+for (var j = 0; j < a.length; j++) {
+    assert.sameValue(a[j], array[j], "Elements mismatch at " + j + ".");
+}

test/built-ins/Array/from/source-sparse-array-onlyStrict.js

@@ -0,0 +1,22 @@
+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+description: Source is a sparse array use onlyStrict
+es6id: 22.1.2.1
+flags: [onlyStrict]
+---*/
+
+var array = [0, 1, -2, 4, -8, , -32, 64, , 256, -512, 1024];
+var arrayIndex = -1;
+function mapFn(value, k) {
+    arrayIndex++;
+    assert.sameValue(value, array[arrayIndex], "From mapFn Element mismatch for index " + arrayIndex + ".");
+    assert.sameValue(k, arrayIndex, "From mapFn index mismatch for " + arrayIndex + ".");
+
+    return value;
+}
+var a = Array.from(array, mapFn);
+for (var j = 0; j < a.length; j++) {
+    assert.sameValue(a[j], array[j], "Elements mismatch at " + j + ".");
+}