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QUnit.test('Map#merge', assert => {
const { merge } = Map.prototype;
const { from } = Array;
assert.isFunction(merge);
assert.arity(merge, 1);
assert.name(merge, 'merge');
assert.looksNative(merge);
assert.nonEnumerable(Map.prototype, 'merge');
const map = new Map([[1, 2]]);
const result = map.merge([[3, 4]]);
assert.same(result, map);
assert.true(result instanceof Map);
assert.deepEqual(from(new Map([[1, 2], [3, 4]]).merge([[5, 6]])), [[1, 2], [3, 4], [5, 6]]);
assert.deepEqual(from(new Map([[1, 2], [3, 4]]).merge([[3, 5], [5, 6]])), [[1, 2], [3, 5], [5, 6]]);
assert.deepEqual(from(new Map([[1, 2], [3, 4]]).merge([])), [[1, 2], [3, 4]]);
assert.deepEqual(from(new Map([[1, 2], [3, 4]]).merge([[3, 5]], [[5, 6]])), [[1, 2], [3, 5], [5, 6]]);
assert.throws(() => merge.call({}, [[1, 2]]), TypeError);
assert.throws(() => merge.call(undefined, [[1, 2]]), TypeError);
assert.throws(() => merge.call(null, [[1, 2]]), TypeError);
});
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