JSTests/test262/test/language/expressions/new/spread-obj-overrides-prev-properties.js

// This file was procedurally generated from the following sources:
// - src/spread/obj-overrides-prev-properties.case
// - src/spread/default/member-expr.template
/*---
description: Object Spread properties overrides previous definitions (`new` operator)
esid: sec-new-operator-runtime-semantics-evaluation
features: [object-spread]
flags: [generated]
info: |
    MemberExpression : new MemberExpression Arguments

    1. Return EvaluateNew(MemberExpression, Arguments).

    12.3.3.1.1 Runtime Semantics: EvaluateNew

    6. If arguments is empty, let argList be an empty List.
    7. Else,
       a. Let argList be ArgumentListEvaluation of arguments.
       [...]

    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).

---*/
let o = {a: 2, b: 3};


var callCount = 0;

new function(obj) {
  assert.sameValue(obj.a, 2);
  assert.sameValue(obj.b, 3);
  assert.sameValue(Object.keys(obj).length, 2);
  assert.sameValue(o.a, 2);
  assert.sameValue(o.b, 3);
  callCount += 1;
}({a: 1, b: 7, ...o});

assert.sameValue(callCount, 1);