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QUnit.test('Map#keyOf', assert => {
const { keyOf } = Map.prototype;
assert.isFunction(keyOf);
assert.name(keyOf, 'keyOf');
assert.arity(keyOf, 1);
assert.looksNative(keyOf);
assert.nonEnumerable(Map.prototype, 'keyOf');
const object = {};
const map = new Map([[1, 1], [2, 2], [3, 3], [4, -0], [5, object], [6, NaN]]);
assert.same(map.keyOf(1), 1);
assert.same(map.keyOf(-0), 4);
assert.same(map.keyOf(0), 4);
assert.same(map.keyOf(object), 5);
assert.same(map.keyOf(4), undefined);
assert.same(map.keyOf(-0.5), undefined);
assert.same(map.keyOf({}), undefined);
assert.same(map.keyOf(NaN), undefined);
assert.throws(() => keyOf.call(new Set(), 1), TypeError);
assert.throws(() => keyOf.call({}, 1), TypeError);
assert.throws(() => keyOf.call([], 1), TypeError);
assert.throws(() => keyOf.call(undefined, 1), TypeError);
assert.throws(() => keyOf.call(null, 1), TypeError);
});
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