1 files changed, 44 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/TypedArray/prototype/findLastIndex/BigInt/predicate-call-this-strict-strict.js b/js/src/tests/test262/built-ins/TypedArray/prototype/findLastIndex/BigInt/predicate-call-this-strict-strict.js
new file mode 100644
index 0000000000..d9219834fe
--- /dev/null
+++ b/js/src/tests/test262/built-ins/TypedArray/prototype/findLastIndex/BigInt/predicate-call-this-strict-strict.js
@@ -0,0 +1,44 @@
+'use strict';
+// Copyright (C) 2021 Microsoft. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-%typedarray%.prototype.findlastindex
+description: >
+  Predicate thisArg as F.call( thisArg, kValue, k, O ) for each array entry.
+info: |
+  %TypedArray%.prototype.findLastIndex ( predicate [ , thisArg ] )
+
+  ...
+  5. Let k be len - 1.
+  6. Repeat, while k ≥ 0
+    ...
+    c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
+    ...
+flags: [onlyStrict]
+includes: [testBigIntTypedArray.js]
+features: [BigInt, TypedArray, array-find-from-last]
+---*/
+
+testWithBigIntTypedArrayConstructors(function(TA) {
+  var sample = new TA(1);
+  var result;
+
+  sample.findLastIndex(function() {
+    result = this;
+  });
+
+  assert.sameValue(
+    result,
+    undefined,
+    "without thisArg, predicate this is undefined"
+  );
+
+  var o = {};
+  sample.findLastIndex(function() {
+    result = this;
+  }, o);
+
+  assert.sameValue(result, o, "thisArg becomes the predicate this");
+});
+
+reportCompare(0, 0);