diff --git a/test/language/statements/class/elements/static-field-anonymous-class-superclass-throws.js b/test/language/statements/class/elements/static-field-anonymous-class-superclass-throws.js
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+++ b/test/language/statements/class/elements/static-field-anonymous-class-superclass-throws.js
@@ -0,0 +1,32 @@
+// 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-evaluatebody
+description: >
+    TypeError is thrown when a static field is initialized with an anonymous class extending a non-constructor.
+info: |
+    Runtime Semantics: EvaluateBody (_functionObject_, _argumentsList_)
+
+    Initializer :
+            `=` AssignmentExpression
+    3. If IsAnonymousFunctionDefinition(|AssignmentExpression|) is *true*, then
+        a. Let _value_ be ? NamedEvaluation of |Initializer| with argument _functionObject_.[[ClassFieldInitializerName]].
+
+    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.
+features: [class-static-fields-public, class]
+---*/
+assert.throws(TypeError, function() {
+    class x {static field = class extends '' {};}
+}, "TypeError is thrown when a static field is initialized with an anonymous class extending a non-constructor.")