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| 'use strict';
|
| var callBind = require('../');
| var bind = require('function-bind');
|
| var test = require('tape');
|
| /*
| * older engines have length nonconfigurable
| * in io.js v3, it is configurable except on bound functions, hence the .bind()
| */
| var functionsHaveConfigurableLengths = !!(
| Object.getOwnPropertyDescriptor
| && Object.getOwnPropertyDescriptor(bind.call(function () {}), 'length').configurable
| );
|
| test('callBind', function (t) {
| var sentinel = { sentinel: true };
| var func = function (a, b) {
| // eslint-disable-next-line no-invalid-this
| return [this, a, b];
| };
| t.equal(func.length, 2, 'original function length is 2');
| t.deepEqual(func(), [undefined, undefined, undefined], 'unbound func with too few args');
| t.deepEqual(func(1, 2), [undefined, 1, 2], 'unbound func with right args');
| t.deepEqual(func(1, 2, 3), [undefined, 1, 2], 'unbound func with too many args');
|
| var bound = callBind(func);
| t.equal(bound.length, func.length + 1, 'function length is preserved', { skip: !functionsHaveConfigurableLengths });
| t.deepEqual(bound(), [undefined, undefined, undefined], 'bound func with too few args');
| t.deepEqual(bound(1, 2), [1, 2, undefined], 'bound func with right args');
| t.deepEqual(bound(1, 2, 3), [1, 2, 3], 'bound func with too many args');
|
| var boundR = callBind(func, sentinel);
| t.equal(boundR.length, func.length, 'function length is preserved', { skip: !functionsHaveConfigurableLengths });
| t.deepEqual(boundR(), [sentinel, undefined, undefined], 'bound func with receiver, with too few args');
| t.deepEqual(boundR(1, 2), [sentinel, 1, 2], 'bound func with receiver, with right args');
| t.deepEqual(boundR(1, 2, 3), [sentinel, 1, 2], 'bound func with receiver, with too many args');
|
| var boundArg = callBind(func, sentinel, 1);
| t.equal(boundArg.length, func.length - 1, 'function length is preserved', { skip: !functionsHaveConfigurableLengths });
| t.deepEqual(boundArg(), [sentinel, 1, undefined], 'bound func with receiver and arg, with too few args');
| t.deepEqual(boundArg(2), [sentinel, 1, 2], 'bound func with receiver and arg, with right arg');
| t.deepEqual(boundArg(2, 3), [sentinel, 1, 2], 'bound func with receiver and arg, with too many args');
|
| t.test('callBind.apply', function (st) {
| var aBound = callBind.apply(func);
| st.deepEqual(aBound(sentinel), [sentinel, undefined, undefined], 'apply-bound func with no args');
| st.deepEqual(aBound(sentinel, [1], 4), [sentinel, 1, undefined], 'apply-bound func with too few args');
| st.deepEqual(aBound(sentinel, [1, 2], 4), [sentinel, 1, 2], 'apply-bound func with right args');
|
| var aBoundArg = callBind.apply(func);
| st.deepEqual(aBoundArg(sentinel, [1, 2, 3], 4), [sentinel, 1, 2], 'apply-bound func with too many args');
| st.deepEqual(aBoundArg(sentinel, [1, 2], 4), [sentinel, 1, 2], 'apply-bound func with right args');
| st.deepEqual(aBoundArg(sentinel, [1], 4), [sentinel, 1, undefined], 'apply-bound func with too few args');
|
| var aBoundR = callBind.apply(func, sentinel);
| st.deepEqual(aBoundR([1, 2, 3], 4), [sentinel, 1, 2], 'apply-bound func with receiver and too many args');
| st.deepEqual(aBoundR([1, 2], 4), [sentinel, 1, 2], 'apply-bound func with receiver and right args');
| st.deepEqual(aBoundR([1], 4), [sentinel, 1, undefined], 'apply-bound func with receiver and too few args');
|
| st.end();
| });
|
| t.end();
| });
|
|
