JSTests/test262/test/language/expressions/coalesce/chainable-if-parenthesis-covered-logical-or.js

// Copyright (C) 2019 Leo Balter. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
description: >
    CoalesceExpression is chainable with the LogicalORExpression is any is covered.
esid: sec-conditional-operator
info: |
    ConditionalExpression :
        ShortCircuitExpression
        ShortCircuitExpression ? AssignmentExpression : AssignmentExpression

    ShortCircuitExpression :
        LogicalORExpression
        CoalesceExpression

    CoalesceExpression :
        CoalesceExpressionHead ?? BitwiseORExpression

    CoalesceExpressionHead :
        CoalesceExpression
        BitwiseORExpression

    Runtime Semantics: Evaluation

    CoalesceExpression:CoalesceExpressionHead??BitwiseORExpression

    1. Let lref be the result of evaluating CoalesceExpressionHead.
    2. Let lval be ? GetValue(lref).
    3. If lval is undefined or null,
        a. Let rref be the result of evaluating BitwiseORExpression.
        b. Return ? GetValue(rref).
    4. Otherwise, return lval.
features: [coalesce-expression]
---*/

var x;

x = undefined;
x = (null ?? 42) || 43;
assert.sameValue(x, 42, '(null ?? 42) || 43');

x = undefined;
x = null ?? (42 || 43);
assert.sameValue(x, 42, 'null ?? (42 || 43)`');

x = undefined;
x = (null || 42) ?? 43;
assert.sameValue(x, 42, '(null || 42) ?? 43');

x = undefined;
x = null || (42 ?? 43);
assert.sameValue(x, 42, 'null || (42 ?? 43)`');

x = undefined;
x = (42 || 43) ?? null;
assert.sameValue(x, 42, '(42 || 43) ?? null');

x = undefined;
x = 42 || (null ?? 43);
assert.sameValue(x, 42, '42 || (null ?? 43)');