From 4118a67befaa2d7031fa7750a4ca75a51b1560a2 Mon Sep 17 00:00:00 2001
From: Alexey Shvayka <shvaikalesh@gmail.com>
Date: Tue, 12 May 2020 00:12:23 +0300
Subject: [PATCH] Add async function test

---
 .../subclass/superclass-async-function.js     | 51 +++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 test/language/statements/class/subclass/superclass-async-function.js

diff --git a/test/language/statements/class/subclass/superclass-async-function.js b/test/language/statements/class/subclass/superclass-async-function.js
new file mode 100644
index 0000000000..74b3ab89a5
--- /dev/null
+++ b/test/language/statements/class/subclass/superclass-async-function.js
@@ -0,0 +1,51 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-runtime-semantics-classdefinitionevaluation
+description: >
+  IsConstructor check is performed before "prototype" lookup.
+  Async functions are not constructors (MakeConstructor is not called on them).
+info: |
+  ClassDefinitionEvaluation
+
+  [...]
+  5. Else,
+    [...]
+    d. Let superclass be ? GetValue(superclassRef).
+    e. If superclass is null, then
+      [...]
+    f. Else if IsConstructor(superclass) is false, throw a TypeError exception.
+features: [async-functions, class, Proxy]
+---*/
+
+async function fn() {}
+Object.defineProperty(fn, "prototype", {
+  get: function() {
+    throw new Test262Error("`superclass.prototype` is unreachable");
+  },
+});
+
+assert.throws(TypeError, function() {
+  class A extends fn {}
+});
+
+var bound = (async function() {}).bind();
+Object.defineProperty(bound, "prototype", {
+  get: function() {
+    throw new Test262Error("`superclass.prototype` is unreachable");
+  },
+});
+
+assert.throws(TypeError, function() {
+  class C extends bound {}
+});
+
+var proxy = new Proxy(async function() {}, {
+  get: function() {
+    throw new Test262Error("`superclass.prototype` is unreachable");
+  },
+});
+
+assert.throws(TypeError, function() {
+  class C extends proxy {}
+});