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QUnit.test('Number.isSafeInteger', assert => {
const { isSafeInteger } = Number;
const { create } = Object;
assert.isFunction(isSafeInteger);
assert.name(isSafeInteger, 'isSafeInteger');
assert.arity(isSafeInteger, 1);
assert.looksNative(isSafeInteger);
assert.nonEnumerable(Number, 'isSafeInteger');
const safeIntegers = [
1,
-1,
2 ** 16,
2 ** 16 - 1,
2 ** 31,
2 ** 31 - 1,
2 ** 32,
2 ** 32 - 1,
-0,
9007199254740991,
-9007199254740991,
];
for (const value of safeIntegers) {
assert.true(isSafeInteger(value), `isSafeInteger ${ typeof value } ${ value }`);
}
const notSafeIntegers = [
9007199254740992,
-9007199254740992,
NaN,
0.1,
Infinity,
'NaN',
'5',
false,
new Number(NaN),
new Number(Infinity),
new Number(5),
new Number(0.1),
undefined,
null,
{},
function () { /* empty */ },
];
for (const value of notSafeIntegers) {
assert.false(isSafeInteger(value), `not isSafeInteger ${ typeof value } ${ value }`);
}
assert.false(isSafeInteger(create(null)), 'Number.isSafeInteger(Object.create(null)) -> false');
});
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