source: trip-planner-front/node_modules/call-bind/test/index.js

Last change on this file was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

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File size: 3.3 KB
Line 
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});
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