From 5faee49d36b18ee108381ff31bbe1234bd98c69f Mon Sep 17 00:00:00 2001
From: Alexey Shvayka <shvaikalesh@gmail.com>
Date: Wed, 19 Feb 2020 23:41:59 +0200
Subject: [PATCH] Add Array#concat non-writable property tests

---
 ...s-with-non-writable-property-spreadable.js | 47 +++++++++++++++++++
 ...eate-species-with-non-writable-property.js | 47 +++++++++++++++++++
 2 files changed, 94 insertions(+)
 create mode 100644 test/built-ins/Array/prototype/concat/create-species-with-non-writable-property-spreadable.js
 create mode 100644 test/built-ins/Array/prototype/concat/create-species-with-non-writable-property.js

diff --git a/test/built-ins/Array/prototype/concat/create-species-with-non-writable-property-spreadable.js b/test/built-ins/Array/prototype/concat/create-species-with-non-writable-property-spreadable.js
new file mode 100644
index 0000000000..fd2d0677e3
--- /dev/null
+++ b/test/built-ins/Array/prototype/concat/create-species-with-non-writable-property-spreadable.js
@@ -0,0 +1,47 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.prototype.concat
+description: >
+  Non-writable properties are overwritten by CreateDataProperty.
+  (result object's "0" is non-writable, argument is spreadable)
+info: |
+  Array.prototype.concat ( ...arguments )
+
+  [...]
+  5. Repeat, while items is not empty
+    [...]
+    c. If spreadable is true, then
+      [...]
+      iv. Repeat, while k < len
+        [...]
+        3. If exists is true, then
+          [...]
+          b. Perform ? CreateDataPropertyOrThrow(A, ! ToString(n), subElement).
+    [...]
+features: [Symbol.species]
+includes: [propertyHelper.js]
+---*/
+
+var A = function(_length) {
+  Object.defineProperty(this, "0", {
+    value: 1,
+    writable: false,
+    enumerable: false,
+    configurable: true,
+  });
+};
+
+var arr = [];
+arr.constructor = {};
+arr.constructor[Symbol.species] = A;
+
+var res = arr.concat([2]);
+
+verifyProperty(res, "0", {
+  value: 2,
+  writable: true,
+  enumerable: true,
+  configurable: true,
+});
diff --git a/test/built-ins/Array/prototype/concat/create-species-with-non-writable-property.js b/test/built-ins/Array/prototype/concat/create-species-with-non-writable-property.js
new file mode 100644
index 0000000000..bdc09e3b15
--- /dev/null
+++ b/test/built-ins/Array/prototype/concat/create-species-with-non-writable-property.js
@@ -0,0 +1,47 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.prototype.concat
+description: >
+  Non-writable properties are overwritten by CreateDataProperty.
+  (result object's "0" is non-writable, argument is not spreadable)
+info: |
+  Array.prototype.concat ( ...arguments )
+
+  [...]
+  5. Repeat, while items is not empty
+    [...]
+    c. If spreadable is true, then
+      [...]
+      iv. Repeat, while k < len
+        [...]
+        3. If exists is true, then
+          [...]
+          b. Perform ? CreateDataPropertyOrThrow(A, ! ToString(n), subElement).
+    [...]
+features: [Symbol.species]
+includes: [propertyHelper.js]
+---*/
+
+var A = function(_length) {
+  Object.defineProperty(this, "0", {
+    value: 1,
+    writable: false,
+    enumerable: false,
+    configurable: true,
+  });
+};
+
+var arr = [];
+arr.constructor = {};
+arr.constructor[Symbol.species] = A;
+
+var res = arr.concat(2);
+
+verifyProperty(res, "0", {
+  value: 2,
+  writable: true,
+  enumerable: true,
+  configurable: true,
+});