JSTests/test262/test/language/expressions/template-literal/literal-expr-obj.js

// Copyright (C) 2014 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es6id: 12.2.8.5
description: Object reference in expression position of TemplateLiteral
info: |
    TemplateLiteral : TemplateHead Expression TemplateSpans

    1. Let head be the TV of TemplateHead as defined in 11.8.6.
    2. Let sub be the result of evaluating Expression.
    3. Let middle be ToString(sub).
---*/

var plain = {};
var custom = {
  toString: function() {
    return '"own" toString';
  }
};

assert.sameValue(`${plain}`, '[object Object]');
assert.sameValue(`1${plain}`, '1[object Object]');
assert.sameValue(`${plain}2`, '[object Object]2');
assert.sameValue(`1${plain}2`, '1[object Object]2');

assert.sameValue(`${custom}`, '"own" toString');
assert.sameValue(`1${custom}`, '1"own" toString');
assert.sameValue(`${custom}2`, '"own" toString2');
assert.sameValue(`1${custom}2`, '1"own" toString2');