1 files changed, 33 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/statements/class/elements/public-class-field-initialization-is-visible-to-proxy.js b/js/src/tests/test262/language/statements/class/elements/public-class-field-initialization-is-visible-to-proxy.js
new file mode 100644
index 0000000000..47d1459d11
--- /dev/null
+++ b/js/src/tests/test262/language/statements/class/elements/public-class-field-initialization-is-visible-to-proxy.js
@@ -0,0 +1,33 @@
+// Copyright (C) 2019 Caio Lima. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Public class field initialization calls [[DefineOwnProperty]] and can be observed by Proxies
+esid: sec-define-field
+info: |
+  DefineField(receiver, fieldRecord)
+    ...
+    8. If fieldName is a Private Name,
+      a. Perform ? PrivateFieldAdd(fieldName, receiver, initValue).
+    9. Else,
+      a. Assert: IsPropertyKey(fieldName) is true.
+      b. Perform ? CreateDataPropertyOrThrow(receiver, fieldName, initValue).
+    10. Return.
+features: [class, class-fields-public]
+---*/
+
+function ProxyBase() {
+  return new Proxy(this, {
+    defineProperty: function (target, key, descriptor) {
+      throw new Test262Error();
+    }
+  });
+}
+
+class Base extends ProxyBase {
+  f = "Test262";
+}
+
+assert.throws(Test262Error, () => { new Base(); });
+
+reportCompare(0, 0);