1 files changed, 41 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/TypedArray/prototype/findLastIndex/predicate-not-called-on-empty-array.js b/js/src/tests/test262/built-ins/TypedArray/prototype/findLastIndex/predicate-not-called-on-empty-array.js
new file mode 100644
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+++ b/js/src/tests/test262/built-ins/TypedArray/prototype/findLastIndex/predicate-not-called-on-empty-array.js
@@ -0,0 +1,41 @@
+// 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 is not called on an empty instance
+info: |
+  %TypedArray%.prototype.findLastIndex ( predicate [ , thisArg ] )
+
+  ...
+  6. Repeat, while k ≥ 0
+    ...
+    c. Let testResult be ! ToBoolean(? Call(predicate, thisArg, « kValue, 𝔽(k), O »)).
+    ...
+  7. Return -1.
+includes: [testTypedArray.js]
+features: [TypedArray, array-find-from-last]
+---*/
+
+testWithTypedArrayConstructors(function(TA) {
+  var sample = new TA();
+  var called = false;
+
+  var predicate = function() {
+    called = true;
+    return true;
+  };
+
+  var result = sample.findLastIndex(predicate);
+
+  assert.sameValue(
+    called, false,
+    "does not call predicate"
+  );
+  assert.sameValue(
+    result, -1,
+    "returns -1 on an empty instance"
+  );
+});
+
+reportCompare(0, 0);