Add %TypedArray%.prototype.lastIndexOf tests

test/built-ins/TypedArray/prototype/lastIndexOf/BigInt/no-arg.js

@@ -0,0 +1,29 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-%typedarray%.prototype.lastindexof
+description: >
+  If `searchElement` is not supplied, -1 is returned.
+info: |
+  %TypedArray%.prototype.lastIndexOf ( searchElement [ , fromIndex ] )
+
+  %TypedArray%.prototype.lastIndexOf is a distinct function that implements
+  the same algorithm as Array.prototype.lastIndexOf as defined in 22.1.3.17
+  except that the this value's [[ArrayLength]] internal slot is accessed
+  in place of performing a [[Get]] of "length".
+
+  Array.prototype.lastIndexOf ( searchElement [ , fromIndex ] )
+
+  [...]
+  8. Return -1.
+includes: [testBigIntTypedArray.js]
+features: [BigInt, TypedArray]
+---*/
+
+testWithBigIntTypedArrayConstructors(function(TA) {
+  var ta1 = new TA();
+  assert.sameValue(ta1.lastIndexOf(), -1);
+
+  var ta2 = new TA([0n, 1n, 2n]);
+  assert.sameValue(ta2.lastIndexOf(), -1);
+});

test/built-ins/TypedArray/prototype/lastIndexOf/no-arg.js

@@ -0,0 +1,29 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-%typedarray%.prototype.lastindexof
+description: >
+  If `searchElement` is not supplied, -1 is returned.
+info: |
+  %TypedArray%.prototype.lastIndexOf ( searchElement [ , fromIndex ] )
+
+  %TypedArray%.prototype.lastIndexOf is a distinct function that implements
+  the same algorithm as Array.prototype.lastIndexOf as defined in 22.1.3.17
+  except that the this value's [[ArrayLength]] internal slot is accessed
+  in place of performing a [[Get]] of "length".
+
+  Array.prototype.lastIndexOf ( searchElement [ , fromIndex ] )
+
+  [...]
+  8. Return -1.
+includes: [testTypedArray.js]
+features: [TypedArray]
+---*/
+
+testWithTypedArrayConstructors(function(TA) {
+  var ta1 = new TA();
+  assert.sameValue(ta1.lastIndexOf(), -1);
+
+  var ta2 = new TA([0, 1, 2]);
+  assert.sameValue(ta2.lastIndexOf(), -1);
+});