1 files changed, 129 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/statements/class/elements/private-methods/prod-private-async-method.js b/js/src/tests/test262/language/statements/class/elements/private-methods/prod-private-async-method.js
new file mode 100644
index 0000000000..fa42763d30
--- /dev/null
+++ b/js/src/tests/test262/language/statements/class/elements/private-methods/prod-private-async-method.js
@@ -0,0 +1,129 @@
+// |reftest| async
+// This file was procedurally generated from the following sources:
+// - src/class-elements/prod-private-async-method.case
+// - src/class-elements/private-methods/cls-decl.template
+/*---
+description: Private Async Method (private method definitions in a class declaration)
+esid: prod-MethodDefinition
+features: [async-functions, class, class-methods-private]
+flags: [generated, async]
+info: |
+    ClassElement :
+      MethodDefinition
+      ...
+      ;
+
+    ClassElementName :
+      PropertyName
+      PrivateName
+
+    PrivateName ::
+      # IdentifierName
+
+    MethodDefinition :
+      ClassElementName ( UniqueFormalParameters ) { FunctionBody }
+      GeneratorMethod
+      AsyncMethod
+      AsyncGeneratorMethod 
+      get ClassElementName () { FunctionBody }
+      set ClassElementName ( PropertySetParameterList ) { FunctionBody }
+
+    GeneratorMethod :
+      * ClassElementName ( UniqueFormalParameters ){GeneratorBody}
+
+    AsyncMethod :
+      async [no LineTerminator here] ClassElementName ( UniqueFormalParameters ) { AsyncFunctionBody }
+
+    AsyncGeneratorMethod :
+      async [no LineTerminator here]* ClassElementName ( UniqueFormalParameters ) { AsyncGeneratorBody }
+
+    ---
+
+    InitializeClassElements ( F, proto )
+
+    ...
+    5. For each item element in order from elements,
+      a. Assert: If element.[[Placement]] is "prototype" or "static", then element.[[Key]] is not a Private Name.
+      b. If element.[[Kind]] is "method" and element.[[Placement]] is "static" or "prototype",
+        i. Let receiver be F if element.[[Placement]] is "static", else let receiver be proto.
+        ii. Perform ? DefineClassElement(receiver, element).
+
+    InitializeInstanceElements ( O, constructor )
+
+    ...
+    3. Let elements be the value of F's [[Elements]] internal slot.
+    4. For each item element in order from elements,
+      a. If element.[[Placement]] is "own" and element.[[Kind]] is "method",
+        i. Perform ? DefineClassElement(O, element).
+
+    DefineClassElement (receiver, element)
+
+    ...
+    6. If key is a Private Name,
+      a. Perform ? PrivateFieldDefine(receiver, key, descriptor).
+
+    PrivateFieldDefine (P, O, desc)
+
+    ...
+    6. Append { [[PrivateName]]: P, [[PrivateFieldDescriptor]]: desc } to O.[[PrivateFieldDescriptors]].
+
+---*/
+var ctorPromise;
+
+
+
+/*** template notes
+ * method should always be #m
+ * the template provides c.ref() for external reference
+ */
+
+function hasProp(obj, name, expected, msg) {
+  var hasOwnProperty = Object.prototype.hasOwnProperty.call(obj, name);
+  assert.sameValue(hasOwnProperty, expected, msg);
+
+  var hasProperty = Reflect.has(obj, name);
+  assert.sameValue(hasProperty, expected, msg);
+}
+
+class C {
+  async #m() { return 42; }
+
+
+  get ref() { return this.#m; }
+
+  constructor() {
+    hasProp(this, '#m', false, 'private methods are defined in an special internal slot and cannot be found as own properties');
+    assert.sameValue(typeof this.#m, 'function');
+    assert.sameValue(this.ref, this.#m, 'returns the same value');
+    assert.sameValue(this.#m, (() => this)().#m, 'memberexpression and call expression forms');
+
+    assert.sameValue(this.#m.name, '#m', 'function name inside constructor');
+    ctorPromise = this.#m().then(value => {
+        assert.sameValue(value, 42, 'already defined in the ctor');
+    }, $DONE);
+
+  }
+}
+
+var c = new C();
+var other = new C();
+
+hasProp(C.prototype, '#m', false, 'method is not defined in the prototype');
+hasProp(C, '#m', false, 'method is not defined in the contructor');
+hasProp(c, '#m', false, 'method cannot be seen outside of the class');
+
+/***
+ * MethodDefinition : ClassElementName ( UniqueFormalParameters ) { FunctionBody }
+ * 
+ * 1. Let methodDef be DefineMethod of MethodDefinition with argument homeObject.
+ * ...
+ */
+assert.sameValue(c.ref, other.ref, 'The method is defined once, and reused on every new instance');
+
+assert.sameValue(c.ref.name, '#m', 'function name is preserved external reference');
+ctorPromise.then(() => {
+    // gets the returned promise from #m
+    return c.ref().then(value => {
+        assert.sameValue(value, 42, 'function return');
+    });
+}).then($DONE, $DONE);