1 files changed, 52 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/TypedArray/prototype/findLastIndex/predicate-call-parameters.js b/js/src/tests/test262/built-ins/TypedArray/prototype/findLastIndex/predicate-call-parameters.js
new file mode 100644
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+++ b/js/src/tests/test262/built-ins/TypedArray/prototype/findLastIndex/predicate-call-parameters.js
@@ -0,0 +1,52 @@
+// 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 called 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 »)).
+  ...
+includes: [testTypedArray.js]
+features: [TypedArray, array-find-from-last]
+---*/
+
+testWithTypedArrayConstructors(function(TA) {
+  var sample = new TA([39, 2, 62]);
+  var results = [];
+  var result;
+
+  sample.foo = "bar"; // Ignores non integer index properties
+
+  sample.findLastIndex(function() {
+    results.push(arguments);
+  });
+
+  assert.sameValue(results.length, 3, "predicate is called for each index");
+
+  result = results[0];
+  assert.sameValue(result[0], 62, "results[0][0] === 62, value");
+  assert.sameValue(result[1], 2, "results[0][1] === 2, index");
+  assert.sameValue(result[2], sample, "results[0][2] === sample, instance");
+  assert.sameValue(result.length, 3, "results[0].length === 3, arguments");
+
+  result = results[1];
+  assert.sameValue(result[0], 2, "results[1][0] === 2, value");
+  assert.sameValue(result[1], 1, "results[1][1] === 1, index");
+  assert.sameValue(result[2], sample, "results[1][2] === sample, instance");
+  assert.sameValue(result.length, 3, "results[1].length === 3, arguments");
+
+  result = results[2];
+  assert.sameValue(result[0], 39, "results[2][0] === 39, value");
+  assert.sameValue(result[1], 0, "results[2][1] === 0, index");
+  assert.sameValue(result[2], sample, "results[2][2] === sample, instance");
+  assert.sameValue(result.length, 3, "results[2].length === 3, arguments");
+});
+
+reportCompare(0, 0);