Add Array.from non-writable property tests

test/built-ins/Array/from/iter-set-elem-prop-non-writable.js

@@ -0,0 +1,43 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.from
+description: >
+  Non-writable properties are overwritten by CreateDataProperty.
+  (result object's "0" is non-writable, items is iterable)
+info: |
+  Array.from ( items [ , mapfn [ , thisArg ] ] )
+
+  [...]
+  5. If usingIterator is not undefined, then
+    [...]
+    e. Repeat,
+      [...]
+      viii. Let defineStatus be CreateDataPropertyOrThrow(A, Pk, mappedValue).
+    [...]
+features: [generators]
+includes: [propertyHelper.js]
+---*/
+
+var items = function* () {
+  yield 2;
+};
+
+var A = function(_length) {
+  Object.defineProperty(this, "0", {
+    value: 1,
+    writable: false,
+    enumerable: false,
+    configurable: true,
+  });
+};
+
+var res = Array.from.call(A, items());
+
+verifyProperty(res, "0", {
+  value: 2,
+  writable: true,
+  enumerable: true,
+  configurable: true,
+});

test/built-ins/Array/from/source-object-length-set-elem-prop-non-writable.js

@@ -0,0 +1,46 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.from
+description: >
+  Non-writable properties are overwritten by CreateDataProperty.
+  (result object's "0" is non-writable, items is not iterable)
+info: |
+  Array.from ( items [ , mapfn [ , thisArg ] ] )
+
+  [...]
+  4. Let usingIterator be ? GetMethod(items, @@iterator).
+  5. If usingIterator is not undefined, then
+    [...]
+  6. NOTE: items is not an Iterable so assume it is an array-like object.
+  [...]
+  12. Repeat, while k < len
+    [...]
+    e. Perform ? CreateDataPropertyOrThrow(A, Pk, mappedValue).
+  [...]
+includes: [propertyHelper.js]
+---*/
+
+var items = {
+  "0": 2,
+  length: 1,
+};
+
+var A = function(_length) {
+  Object.defineProperty(this, "0", {
+    value: 1,
+    writable: false,
+    enumerable: false,
+    configurable: true,
+  });
+};
+
+var res = Array.from.call(A, items);
+
+verifyProperty(res, "0", {
+  value: 2,
+  writable: true,
+  enumerable: true,
+  configurable: true,
+});