added tests for groupBy

test/built-ins/Array/prototype/groupBy/callback-arg.js

@@ -0,0 +1,33 @@
+// Copyright (c) 2021 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.prototype.groupBy
+description: Array.prototype.groupBy populates Map with correct keys and values
+info: |
+  22.1.3.14 Array.prototype.groupBy ( callbackfn [ , thisArg ] )
+
+  ...
+
+  6. Repeat, while k < len
+
+      a. Let Pk be ! ToString(𝔽(k)).
+      b. Let kValue be ? Get(O, Pk).
+      c. Let propertyKey be ? ToPropertyKey(? Call(callbackfn, thisArg, « kValue, 𝔽(k), O »)).
+      d. Perform ! AddValueToKeyedGroup(groups, propertyKey, kValue).
+      e. Set k to k + 1.
+  ...
+
+---*/
+
+
+const arr = [-0,0,1,2,3];
+
+const sentinel = {};
+
+const map = arr.groupBy.call(sentinel, (n,i,testArr) => {
+    assert.sameValue(this, sentinel, "this value is correctly bound");
+    assert.sameValue(n, arr[i], "selected element aligns with index");
+    assert.sameValue(testArr, arr, "original array is passed as final argument");
+    return null; 
+});

test/built-ins/Array/prototype/groupBy/emptyList.js

@@ -0,0 +1,23 @@
+// Copyright (c) 2021 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.prototype.groupBy
+description: Array.prototype.groupBy populates Map with correct keys and values
+info: |
+  22.1.3.14 Array.prototype.groupBy ( callbackfn [ , thisArg ] )
+
+  ...
+
+  8. For each Record { [[Key]], [[Elements]] } g of groups, do
+
+    a. Let elements be ! CreateArrayFromList(g.[[Elements]]).
+    b. Perform ! CreateDataPropertyOrThrow(obj, g.[[Key]], elements).
+
+  ...
+
+---*/
+
+const obj = [].groupBy(i=>i);
+
+assert.sameValue(Object.keys(obj).length, 0);

test/built-ins/Array/prototype/groupBy/evenOdd.js

@@ -0,0 +1,26 @@
+// Copyright (c) 2021 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.prototype.groupBy
+description: Array.prototype.groupBy populates Map with correct keys and values
+info: |
+  22.1.3.14 Array.prototype.groupBy ( callbackfn [ , thisArg ] )
+
+  ...
+
+  8. For each Record { [[Key]], [[Elements]] } g of groups, do
+
+    a. Let elements be ! CreateArrayFromList(g.[[Elements]]).
+    b. Perform ! CreateDataPropertyOrThrow(obj, g.[[Key]], elements).
+
+  ...
+---*/
+
+const array = [1,2,3];
+
+const obj = array.groupBy(i=>{return i%2===0?'even':'odd';});
+
+assert.sameValue(obj['even'][0], 2);
+assert.sameValue(obj['odd'][0], 1);
+assert.sameValue(obj['odd'][1], 3);

test/built-ins/Array/prototype/groupBy/groupByLength.js

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+// Copyright (c) 2021 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.prototype.groupBy
+description: Array.prototype.groupBy populates Map with correct keys and values
+info: |
+  22.1.3.14 Array.prototype.groupBy ( callbackfn [ , thisArg ] )
+
+  ...
+
+  8. For each Record { [[Key]], [[Elements]] } g of groups, do
+
+    a. Let elements be ! CreateArrayFromList(g.[[Elements]]).
+    b. Perform ! CreateDataPropertyOrThrow(obj, g.[[Key]], elements).
+
+  ...
+
+---*/
+
+const arr = ['test', 'hello', 'world'];
+
+const obj = arr.groupBy(i=>i.length);
+
+assert.sameValue(obj["4"][0], 'test');
+assert.sameValue(obj["5"][0], 'hello');
+assert.sameValue(obj["5"][1], 'world')

test/built-ins/Array/prototype/groupBy/length.js

@@ -0,0 +1,29 @@
+
+// Copyright (c) 2021 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.prototype.groupBy
+description: Array.prototype.groupBy property length descriptor
+info: |
+  22.1.3.14 Array.prototype.groupBy ( callbackfn [ , thisArg ] )
+
+  ...
+
+    17 ECMAScript Standard Built-in Objects
+  
+  ...
+
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(
+  Array.prototype.groupBy.length, 1,
+  'The value of `Array.prototype.groupBy.length` is `1`'
+);
+  
+verifyProperty(Array.prototype.groupBy, "length", {
+  enumerable: false,
+  writable: false,
+  configurable: true
+});

test/built-ins/Array/prototype/groupBy/name.js

@@ -0,0 +1,28 @@
+// Copyright (c) 2021 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.prototype.groupBy
+description: Array.prototype.groupBy property name descriptor
+info: |
+  22.1.3.14 Array.prototype.groupBy ( callbackfn [ , thisArg ] )
+
+  ...
+
+    17 ECMAScript Standard Built-in Objects
+  
+  ...
+
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(
+    Array.prototype.groupBy.name, 'groupBy',
+    'The value of `Array.prototype.groupBy.name` is `"groupBy"`'
+);
+  
+verifyProperty(Array.prototype.groupBy, "name", {
+  enumerable: false,
+  writable: false,
+  configurable: true
+});

test/built-ins/Array/prototype/groupBy/null.js

@@ -0,0 +1,21 @@
+// Copyright (c) 2021 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.prototype.groupBy
+description: Array.prototype.groupBy applied to null throws a TypeError
+info: |
+  22.1.3.14 Array.prototype.groupBy ( callbackfn [ , thisArg ] )
+
+  ...
+
+  3. If IsCallable(callbackfn) is false, throw a TypeError exception.
+
+  ...
+
+---*/
+
+
+assert.throws(TypeError, function() {
+  Array.prototype.groupBy.call(null,null);
+});

test/built-ins/Array/prototype/groupBy/undefined.js

@@ -0,0 +1,21 @@
+// Copyright (c) 2021 Ecma International.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.prototype.groupBy
+description: Array.prototype.groupBy applied to undefined throws a TypeError
+info: |
+  22.1.3.14 Array.prototype.groupBy ( callbackfn [ , thisArg ] )
+
+  ...
+
+  3. If IsCallable(callbackfn) is false, throw a TypeError exception.
+
+  ...
+
+---*/
+
+
+assert.throws(TypeError, function() {
+  Array.prototype.groupBy.call(undefined);
+});