Add tests for TypedArrays reverse

test/built-ins/TypedArray/prototype/reverse/get-length-uses-internal-arraylength.js

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+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-%typedarray%.prototype.reverse
+description: Get "length" uses internal ArrayLength
+info: >
+  22.2.3.22 %TypedArray%.prototype.reverse ( )
+
+  %TypedArray%.prototype.reverse is a distinct function that implements the same
+  algorithm as Array.prototype.reverse as defined in 22.1.3.21 except that the
+  this object's [[ArrayLength]] internal slot is accessed in place of performing
+  a [[Get]] of "length".
+
+  22.1.3.21 Array.prototype.reverse ( )
+
+  1. Let O be ? ToObject(this value).
+  2. Let len be ? ToLength(? Get(O, "length")).
+  ...
+includes: [testTypedArray.js]
+---*/
+
+var getCalls = 0;
+var desc = {
+  get: function getLen() {
+    getCalls++;
+    return 0;
+  }
+};
+
+Object.defineProperty(TypedArray.prototype, "length", desc);
+
+testWithTypedArrayConstructors(function(TA) {
+  var sample = new TA([42, 43]);
+
+  Object.defineProperty(TA.prototype, "length", desc);
+  Object.defineProperty(sample, "length", desc);
+
+  sample.reverse();
+
+  assert.sameValue(getCalls, 0, "ignores length properties");
+});

test/built-ins/TypedArray/prototype/reverse/preserves-non-numeric-properties.js

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+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-%typedarray%.prototype.reverse
+description: Preserves non numeric properties
+info: >
+  22.2.3.22 %TypedArray%.prototype.reverse ( )
+
+  %TypedArray%.prototype.reverse is a distinct function that implements the same
+  algorithm as Array.prototype.reverse as defined in 22.1.3.21 except that the
+  this object's [[ArrayLength]] internal slot is accessed in place of performing
+  a [[Get]] of "length".
+
+  22.1.3.21 Array.prototype.reverse ( )
+
+  ...
+  6. Return O.
+includes: [testTypedArray.js]
+features: [Symbol]
+---*/
+
+var s = Symbol("1");
+
+testWithTypedArrayConstructors(function(TA) {
+  var sample, result;
+
+  sample = new TA(2);
+  sample.foo = 42;
+  sample.bar = "bar";
+  sample[s] = 1;
+  result = sample.reverse();
+  assert.sameValue(result.foo, 42, "sample.foo === 42");
+  assert.sameValue(result.bar, "bar", "sample.bar === 'bar'");
+  assert.sameValue(result[s], 1, "sample[s] === 1");
+});

test/built-ins/TypedArray/prototype/reverse/returns-original-object.js

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+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-%typedarray%.prototype.reverse
+description: Returns the same object
+info: >
+  22.2.3.22 %TypedArray%.prototype.reverse ( )
+
+  %TypedArray%.prototype.reverse is a distinct function that implements the same
+  algorithm as Array.prototype.reverse as defined in 22.1.3.21 except that the
+  this object's [[ArrayLength]] internal slot is accessed in place of performing
+  a [[Get]] of "length".
+
+  22.1.3.21 Array.prototype.reverse ( )
+
+  ...
+  6. Return O.
+includes: [testTypedArray.js]
+---*/
+
+var buffer = new ArrayBuffer(64);
+
+testWithTypedArrayConstructors(function(TA) {
+  var sample, result, expectedLength;
+
+  sample = new TA(buffer, 0);
+  expectedLength = sample.length;
+  result = sample.reverse();
+  assert.sameValue(result, sample, "returns the same object");
+  assert.sameValue(sample.buffer, buffer, "keeps the same buffer");
+  assert.sameValue(sample.length, expectedLength, "length is preserved");
+
+  sample = new TA(buffer, 0, 0);
+  result = sample.reverse();
+  assert.sameValue(result, sample, "returns the same object (empty instance)");
+  assert.sameValue(sample.buffer, buffer, "keeps the same buffer (empty instance)");
+  assert.sameValue(sample.length, 0, "length is preserved (empty instance)");
+});

test/built-ins/TypedArray/prototype/reverse/reverts.js

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+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-%typedarray%.prototype.reverse
+description: Reverts values
+info: >
+  22.2.3.22 %TypedArray%.prototype.reverse ( )
+
+  %TypedArray%.prototype.reverse is a distinct function that implements the same
+  algorithm as Array.prototype.reverse as defined in 22.1.3.21 except that the
+  this object's [[ArrayLength]] internal slot is accessed in place of performing
+  a [[Get]] of "length".
+
+  22.1.3.21 Array.prototype.reverse ( )
+
+  ...
+  6. Return O.
+includes: [testTypedArray.js, compareArray.js]
+---*/
+
+var buffer = new ArrayBuffer(64);
+
+testWithTypedArrayConstructors(function(TA) {
+  var sample = new TA(buffer, 0, 4);
+  var other = new TA(buffer, 0, 5);
+
+  sample[0] = 42;
+  sample[1] = 43;
+  sample[2] = 2;
+  sample[3] = 1;
+  other[4] = 7;
+
+  sample.reverse();
+  assert(
+    compareArray(sample, [1, 2, 43, 42])
+  );
+
+  assert(
+    compareArray(other, [1, 2, 43, 42, 7])
+  );
+
+  sample[0] = 7;
+  sample[1] = 17;
+  sample[2] = 1;
+  sample[3] = 0;
+  other[4] = 42;
+
+  other.reverse();
+  assert(
+    compareArray(other, [42, 0, 1, 17, 7])
+  );
+
+  assert(
+    compareArray(sample, [42, 0, 1, 17])
+  );
+});