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QUnit.test('Number.isInteger', assert => {
const { isInteger } = Number;
const { create } = Object;
assert.isFunction(isInteger);
assert.name(isInteger, 'isInteger');
assert.arity(isInteger, 1);
assert.looksNative(isInteger);
assert.nonEnumerable(Number, 'isInteger');
const integers = [
1,
-1,
2 ** 16,
2 ** 16 - 1,
2 ** 31,
2 ** 31 - 1,
2 ** 32,
2 ** 32 - 1,
-0,
];
for (const value of integers) {
assert.true(isInteger(value), `isInteger ${ typeof value } ${ value }`);
}
const notIntegers = [
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 notIntegers) {
assert.false(isInteger(value), `not isInteger ${ typeof value } ${ value }`);
}
assert.false(isInteger(create(null)), 'Number.isInteger(Object.create(null)) -> false');
});
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