1 files changed, 54 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/TypedArray/prototype/findIndex/BigInt/get-length-ignores-length-prop.js b/js/src/tests/test262/built-ins/TypedArray/prototype/findIndex/BigInt/get-length-ignores-length-prop.js
new file mode 100644
index 0000000000..a6ac97105e
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+++ b/js/src/tests/test262/built-ins/TypedArray/prototype/findIndex/BigInt/get-length-ignores-length-prop.js
@@ -0,0 +1,54 @@
+// 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.findindex
+description: >
+  [[Get]] of "length" uses [[ArrayLength]]
+info: |
+  22.2.3.11 %TypedArray%.prototype.findIndex ( predicate [ , thisArg ] )
+
+  %TypedArray%.prototype.findIndex is a distinct function that implements the
+  same algorithm as Array.prototype.findIndex as defined in 22.1.3.9 except that
+  the this object's [[ArrayLength]] internal slot is accessed in place of
+  performing a [[Get]] of "length".
+
+  ...
+
+  22.1.3.9 Array.prototype.findIndex ( predicate[ , thisArg ] )
+
+  ...
+  2. Let len be ? ToLength(? Get(O, "length")).
+  ...
+includes: [testBigIntTypedArray.js]
+features: [BigInt, TypedArray]
+---*/
+
+Object.defineProperty(TypedArray.prototype, "length", {
+  get: function() {
+    throw new Test262Error();
+  }
+});
+
+testWithBigIntTypedArrayConstructors(function(TA) {
+  Object.defineProperty(TA.prototype, "length", {
+    get: function() {
+      throw new Test262Error();
+    }
+  });
+
+  var sample = new TA([42n]);
+
+  Object.defineProperty(sample, "length", {
+    get: function() {
+      throw new Test262Error();
+    },
+    configurable: true
+  });
+
+  assert.sameValue(
+    sample.findIndex(function() { return true; }),
+    0
+  );
+});
+
+reportCompare(0, 0);