Add test case where IteratorBindingInitialization-SingleNameBinding NamedEvaluation throws

test/language/destructuring/binding/iteratorbindinginitialization-singlenamebinding-namedevaluation-throws.js

@@ -0,0 +1,43 @@
+// Copyright (C) 2026 Garham Lee. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-runtime-semantics-bindinginitialization
+description: >
+    IteratorBindingInitialization of SingleNameBinding : BindingIdentifier Initializer? throws when ClassHeritage is not an object.
+info: |
+    Runtime Semantics: BindingInitialization (_value_, _environment_)
+
+    BindingPattern : ArrayBindingPattern
+    1. Let _iteratorRecord_ be ? GetIterator(_value_, ~sync~).
+    2. Let _result_ be Completion(IteratorBindingInitialization of |ArrayBindingPattern| with arguments _iteratorRecord_ and _environment_).
+
+    Runtime Semantics: IteratorBindingInitialization (_iteratorRecord_, _environment_)
+
+    SingleNameBinding : BindingIdentifier Initializer?
+    1. Let _bindingId_ be the StringValue of |BindingIdentifier|.
+    3. Let _v_ be *undefined*.
+    5. If |Initializer| is present and _v_ is *undefined*, then
+        a. If IsAnonymousFunctionDefinition(|Initializer|) is *true*, then
+            i. Set _v_ to ? NamedEvaluation of |Initializer| with argument _bindingId_.
+
+    Runtime Semantics: NamedEvaluation (_name_)
+
+    ClassExpression : `class` ClassTail
+    1. Let _value_ be ? ClassDefinitionEvaluation of |ClassTail| with arguments *undefined* and _name_.
+
+    Runtime Semantics: ClassDefinitionEvaluation (_classBinding_, _className_)
+
+    ClassTail : ClassHeritage? `{` ClassBody? `}`
+    8.c. Let _superclassRef_ be Completion(Evaluation of |ClassHeritage|).
+    8.e. Let _superclass_ be ? GetValue(? _superclassRef_).
+    8.g. Else if IsConstructor(_superclass_) is *false*, then
+        i. Throw a *TypeError* exception.
+
+    IsConstructor (_argument_)
+    1. If _argument_ is not an Object, return *false*.
+features: [destructuring-binding]
+---*/
+assert.throws(TypeError, function () {
+    var [x = class extends x {}] = ''
+}, "IteratorBindingInitialization of SingleNameBinding : BindingIdentifier Initializer? throws when ClassHeritage is not an object.");