src/spread/obj-mult-spread-getter.case

// Copyright (C) 2017 Caio Lima. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
desc: Multiple Object Spread usage calls getter multiple times
template: default
esid: pending
info: |
    Pending Runtime Semantics: PropertyDefinitionEvaluation

    PropertyDefinition:...AssignmentExpression

    1. Let exprValue be the result of evaluating AssignmentExpression.
    2. Let fromValue be GetValue(exprValue).
    3. ReturnIfAbrupt(fromValue).
    4. Let excludedNames be a new empty List.
    5. Return CopyDataProperties(object, fromValue, excludedNames).
features: [object-spread]
---*/

//- setup
let getterCallCount = 0;
let o = {
    get a() {
        return ++getterCallCount;
    }
};

//- args
{...o, c: 4, d: 5, a: 42, ...o}
//- params
obj
//- body
assert.sameValue(obj.a, 2);
assert.sameValue(obj.c, 4);
assert.sameValue(obj.d, 5);
assert.sameValue(Object.keys(obj).length, 3);