1 files changed, 28 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/expressions/in/private-field-presence-field.js b/js/src/tests/test262/language/expressions/in/private-field-presence-field.js
new file mode 100644
index 0000000000..50a24a6aa5
--- /dev/null
+++ b/js/src/tests/test262/language/expressions/in/private-field-presence-field.js
@@ -0,0 +1,28 @@
+// Copyright 2021 the V8 project authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Value when private name describes a field
+info: |
+  7. Let privateName be ? GetValue(privateNameBinding).
+  8. Assert: privateName is a Private Name.
+  9. If privateName.[[Kind]] is "field",
+     a. If ! PrivateFieldFind(privateName, rval) is not empty, then return true.
+  [...]
+  11. Return false.
+esid: sec-relational-operators-runtime-semantics-evaluation
+features: [class-fields-private, class-fields-private-in]
+---*/
+
+class Class {
+  #field;
+
+  static isNameIn(value) {
+    return #field in value;
+  }
+}
+
+assert.sameValue(Class.isNameIn({}), false);
+assert.sameValue(Class.isNameIn(new Class()), true);
+
+reportCompare(0, 0);