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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(); });