1 files changed, 39 insertions, 0 deletions
diff --git a/js/src/tests/test262/annexB/language/statements/const/dstr/array-pattern-emulates-undefined.js b/js/src/tests/test262/annexB/language/statements/const/dstr/array-pattern-emulates-undefined.js
new file mode 100644
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+++ b/js/src/tests/test262/annexB/language/statements/const/dstr/array-pattern-emulates-undefined.js
@@ -0,0 +1,39 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-destructuring-binding-patterns-runtime-semantics-bindinginitialization
+description: >
+  Destructuring initializer is not evaluated when value is an object
+  with [[IsHTMLDDA]] internal slot.
+info: |
+  BindingPattern : ArrayBindingPattern
+
+  1. Let iteratorRecord be ? GetIterator(value).
+  2. Let result be IteratorBindingInitialization of ArrayBindingPattern with arguments
+  iteratorRecord and environment.
+  3. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iteratorRecord, result).
+  4. Return result.
+
+  Runtime Semantics: IteratorBindingInitialization
+
+  SingleNameBinding : BindingIdentifier Initializer[opt]
+
+  [...]
+  5. If Initializer is present and v is undefined, then
+    [...]
+  6. If environment is undefined, return ? PutValue(lhs, v).
+features: [destructuring-binding, IsHTMLDDA]
+---*/
+
+let initCount = 0;
+const counter = function() {
+  initCount += 1;
+};
+
+const IsHTMLDDA = $262.IsHTMLDDA;
+const [x = counter()] = [IsHTMLDDA];
+
+assert.sameValue(x, IsHTMLDDA);
+assert.sameValue(initCount, 0);
+
+reportCompare(0, 0);