1'use strict';
2
3var callBind = require('../');
4var bind = require('function-bind');
5
6var test = require('tape');
7
8/*
9 * older engines have length nonconfigurable
10 * in io.js v3, it is configurable except on bound functions, hence the .bind()
11 */
12var functionsHaveConfigurableLengths = !!(
13	Object.getOwnPropertyDescriptor
14	&& Object.getOwnPropertyDescriptor(bind.call(function () {}), 'length').configurable
15);
16
17test('callBind', function (t) {
18	var sentinel = { sentinel: true };
19	var func = function (a, b) {
20		// eslint-disable-next-line no-invalid-this
21		return [this, a, b];
22	};
23	t.equal(func.length, 2, 'original function length is 2');
24	t.deepEqual(func(), [undefined, undefined, undefined], 'unbound func with too few args');
25	t.deepEqual(func(1, 2), [undefined, 1, 2], 'unbound func with right args');
26	t.deepEqual(func(1, 2, 3), [undefined, 1, 2], 'unbound func with too many args');
27
28	var bound = callBind(func);
29	t.equal(bound.length, func.length + 1, 'function length is preserved', { skip: !functionsHaveConfigurableLengths });
30	t.deepEqual(bound(), [undefined, undefined, undefined], 'bound func with too few args');
31	t.deepEqual(bound(1, 2), [1, 2, undefined], 'bound func with right args');
32	t.deepEqual(bound(1, 2, 3), [1, 2, 3], 'bound func with too many args');
33
34	var boundR = callBind(func, sentinel);
35	t.equal(boundR.length, func.length, 'function length is preserved', { skip: !functionsHaveConfigurableLengths });
36	t.deepEqual(boundR(), [sentinel, undefined, undefined], 'bound func with receiver, with too few args');
37	t.deepEqual(boundR(1, 2), [sentinel, 1, 2], 'bound func with receiver, with right args');
38	t.deepEqual(boundR(1, 2, 3), [sentinel, 1, 2], 'bound func with receiver, with too many args');
39
40	var boundArg = callBind(func, sentinel, 1);
41	t.equal(boundArg.length, func.length - 1, 'function length is preserved', { skip: !functionsHaveConfigurableLengths });
42	t.deepEqual(boundArg(), [sentinel, 1, undefined], 'bound func with receiver and arg, with too few args');
43	t.deepEqual(boundArg(2), [sentinel, 1, 2], 'bound func with receiver and arg, with right arg');
44	t.deepEqual(boundArg(2, 3), [sentinel, 1, 2], 'bound func with receiver and arg, with too many args');
45
46	t.test('callBind.apply', function (st) {
47		var aBound = callBind.apply(func);
48		st.deepEqual(aBound(sentinel), [sentinel, undefined, undefined], 'apply-bound func with no args');
49		st.deepEqual(aBound(sentinel, [1], 4), [sentinel, 1, undefined], 'apply-bound func with too few args');
50		st.deepEqual(aBound(sentinel, [1, 2], 4), [sentinel, 1, 2], 'apply-bound func with right args');
51
52		var aBoundArg = callBind.apply(func);
53		st.deepEqual(aBoundArg(sentinel, [1, 2, 3], 4), [sentinel, 1, 2], 'apply-bound func with too many args');
54		st.deepEqual(aBoundArg(sentinel, [1, 2], 4), [sentinel, 1, 2], 'apply-bound func with right args');
55		st.deepEqual(aBoundArg(sentinel, [1], 4), [sentinel, 1, undefined], 'apply-bound func with too few args');
56
57		var aBoundR = callBind.apply(func, sentinel);
58		st.deepEqual(aBoundR([1, 2, 3], 4), [sentinel, 1, 2], 'apply-bound func with receiver and too many args');
59		st.deepEqual(aBoundR([1, 2], 4), [sentinel, 1, 2], 'apply-bound func with receiver and right args');
60		st.deepEqual(aBoundR([1], 4), [sentinel, 1, undefined], 'apply-bound func with receiver and too few args');
61
62		st.end();
63	});
64
65	t.end();
66});
67