JSTests/test262/test/language/expressions/coalesce/chainable-if-parenthesis-covered-logical-and.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 LogicalANDExpression 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 ?? 41) && 42;
assert.sameValue(x, 42, '(null ?? 41) && 42');

x = undefined;
x = null ?? (41 && 42);
assert.sameValue(x, 42, 'null ?? (41 && 42)`');

x = undefined;
x = (41 && 42) ?? null;
assert.sameValue(x, 42, '(41 && 42) ?? null');

x = undefined;
x = 41 && (null ?? 42);
assert.sameValue(x, 42, '41 && (null ?? 42)`');