From 49039979c83ea6e458a8dd7eda75f69996f333a9 Mon Sep 17 00:00:00 2001
From: Kevin Gibbons <kevin@shapesecurity.com>
Date: Mon, 9 Apr 2018 12:02:22 -0700
Subject: [PATCH] Add test for double super for proposal-class-fields#92
---
.../class/fields-run-once-on-double-super.js | 41 +++++++++++++++++++
1 file changed, 41 insertions(+)
create mode 100644 test/language/expressions/class/fields-run-once-on-double-super.js
diff --git a/test/language/expressions/class/fields-run-once-on-double-super.js b/test/language/expressions/class/fields-run-once-on-double-super.js
new file mode 100644
index 0000000000..e01de58ca8
--- /dev/null
+++ b/test/language/expressions/class/fields-run-once-on-double-super.js
@@ -0,0 +1,41 @@
+// Copyright (C) 2018 Kevin Gibbons. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-super-keyword-runtime-semantics-evaluation
+description: >
+ when calling `super()` for a second time in a derived class, the super constructor is run twice but the field initializers are only run once
+info: |
+ [...]
+ 6. Let result be ? Construct(func, argList, newTarget).
+ [...]
+ 10. Perform ? thisER.BindThisValue(result).
+ 11. Perform ? InitializeInstanceFields(result, F).
+ [...]
+features: [class-fields-public]
+---*/
+
+
+var baseCtorCalled = 0;
+var fieldInitCalled = 0;
+class Base {
+ constructor() {
+ ++baseCtorCalled;
+ }
+}
+
+var C = class extends Base {
+ field = ++fieldInitCalled;
+ constructor() {
+ assert.sameValue(baseCtorCalled, 0);
+ assert.sameValue(fieldInitCalled, 0);
+ super();
+ assert.sameValue(baseCtorCalled, 1);
+ assert.sameValue(fieldInitCalled, 1);
+ assert.throws(ReferenceError, () => super());
+ }
+};
+
+new C();
+
+assert.sameValue(baseCtorCalled, 2);
+assert.sameValue(fieldInitCalled, 1);
--
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