3 files changed, 104 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/TypedArray/prototype/at/BigInt/browser.js b/js/src/tests/test262/built-ins/TypedArray/prototype/at/BigInt/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/built-ins/TypedArray/prototype/at/BigInt/browser.js
diff --git a/js/src/tests/test262/built-ins/TypedArray/prototype/at/BigInt/return-abrupt-from-this-out-of-bounds.js b/js/src/tests/test262/built-ins/TypedArray/prototype/at/BigInt/return-abrupt-from-this-out-of-bounds.js
new file mode 100644
index 0000000000..33f5aeb6d4
--- /dev/null
+++ b/js/src/tests/test262/built-ins/TypedArray/prototype/at/BigInt/return-abrupt-from-this-out-of-bounds.js
@@ -0,0 +1,62 @@
+// |reftest| skip -- resizable-arraybuffer is not supported
+// Copyright (C) 2021 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-%typedarray%.prototype.at
+description: Return abrupt when "this" value fails buffer boundary checks
+includes: [testBigIntTypedArray.js]
+features: [ArrayBuffer, BigInt, TypedArray, TypedArray.prototype.at, arrow-function, resizable-arraybuffer]
+---*/
+
+assert.sameValue(
+  typeof TypedArray.prototype.at,
+  'function',
+  'implements TypedArray.prototype.at'
+);
+
+assert.sameValue(
+  typeof ArrayBuffer.prototype.resize,
+  'function',
+  'implements ArrayBuffer.prototype.resize'
+);
+
+testWithBigIntTypedArrayConstructors(TA => {
+  var BPE = TA.BYTES_PER_ELEMENT;
+  var ab = new ArrayBuffer(BPE * 4, {maxByteLength: BPE * 5});
+  var array = new TA(ab, BPE, 2);
+
+  try {
+    ab.resize(BPE * 5);
+  } catch (_) {}
+
+  // no error following grow:
+  array.at(0);
+
+  try {
+    ab.resize(BPE * 3);
+  } catch (_) {}
+
+  // no error following shrink (within bounds):
+  array.at(0);
+
+  var expectedError;
+  try {
+    ab.resize(BPE * 2);
+    // If the preceding "resize" operation is successful, the typed array will
+    // be out out of bounds, so the subsequent prototype method should produce
+    // a TypeError due to the semantics of ValidateTypedArray.
+    expectedError = TypeError;
+  } catch (_) {
+    // The host is permitted to fail any "resize" operation at its own
+    // discretion. If that occurs, the at operation should complete
+    // successfully.
+    expectedError = Test262Error;
+  }
+
+  assert.throws(expectedError, () => {
+    array.at(0);
+    throw new Test262Error('at completed successfully');
+  });
+});
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/built-ins/TypedArray/prototype/at/BigInt/shell.js b/js/src/tests/test262/built-ins/TypedArray/prototype/at/BigInt/shell.js
new file mode 100644
index 0000000000..90ee9c114d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/TypedArray/prototype/at/BigInt/shell.js
@@ -0,0 +1,42 @@
+// GENERATED, DO NOT EDIT
+// file: testBigIntTypedArray.js
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: |
+    Collection of functions used to assert the correctness of BigInt TypedArray objects.
+defines:
+  - TypedArray
+  - testWithBigIntTypedArrayConstructors
+---*/
+
+/**
+ * The %TypedArray% intrinsic constructor function.
+ */
+var TypedArray = Object.getPrototypeOf(Int8Array);
+
+/**
+ * Calls the provided function for every typed array constructor.
+ *
+ * @param {typedArrayConstructorCallback} f - the function to call for each typed array constructor.
+ * @param {Array} selected - An optional Array with filtered typed arrays
+ */
+function testWithBigIntTypedArrayConstructors(f, selected) {
+  /**
+   * Array containing every BigInt typed array constructor.
+   */
+  var constructors = selected || [
+    BigInt64Array,
+    BigUint64Array
+  ];
+
+  for (var i = 0; i < constructors.length; ++i) {
+    var constructor = constructors[i];
+    try {
+      f(constructor);
+    } catch (e) {
+      e.message += " (Testing with " + constructor.name + ".)";
+      throw e;
+    }
+  }
+}