90 lines
2.6 KiB
JavaScript
90 lines
2.6 KiB
JavaScript
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'use strict';
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var test = require('tape');
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var mockProperty = require('mock-property');
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var hasSymbols = require('has-symbols/shams')();
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var isConcatSpreadable = hasSymbols && Symbol.isConcatSpreadable;
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var species = hasSymbols && Symbol.species;
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var boundFnsHaveConfigurableLengths = Object.getOwnPropertyDescriptor && Object.getOwnPropertyDescriptor(function () {}.bind(), 'length').configurable;
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var safeConcat = require('../');
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test('safe-array-concat', function (t) {
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t.equal(typeof safeConcat, 'function', 'is a function');
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t.equal(
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safeConcat.length,
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boundFnsHaveConfigurableLengths ? 1 : 0,
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'has a length of ' + (boundFnsHaveConfigurableLengths ? 1 : '0 (function lengths are not configurable)'),
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'length is as expected'
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);
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t.deepEqual(
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safeConcat([1, 2], [3, 4], 'foo', 5, 6, [[7]]),
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[1, 2, 3, 4, 'foo', 5, 6, [7]],
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'works with flat and nested arrays'
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);
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t.deepEqual(
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safeConcat(undefined, 1, 2),
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[undefined, 1, 2],
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'first item as undefined is not the concat receiver, which would throw via ToObject'
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);
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t.deepEqual(
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safeConcat(null, 1, 2),
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[null, 1, 2],
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'first item as null is not the concat receiver, which would throw via ToObject'
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);
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var arr = [1, 2];
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arr.constructor = function C() {
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return { args: arguments };
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};
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t.deepEqual(
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safeConcat(arr, 3, 4),
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[1, 2, 3, 4],
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'first item as an array with a nonArray .constructor; ignores constructor'
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);
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t.test('has Symbol.species', { skip: !species }, function (st) {
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var speciesArr = [1, 2];
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speciesArr.constructor = {};
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speciesArr.constructor[species] = function Species() {
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return { args: arguments };
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};
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st.deepEqual(
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safeConcat(speciesArr, 3, 4),
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[1, 2, 3, 4],
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'first item as an array with a .constructor object with a Symbol.species; ignores constructor and species'
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);
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st.end();
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});
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t.test('has isConcatSpreadable', { skip: !isConcatSpreadable }, function (st) {
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st.teardown(mockProperty(String.prototype, isConcatSpreadable, { value: true }));
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var nonSpreadable = [1, 2];
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nonSpreadable[isConcatSpreadable] = false;
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st.deepEqual(
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safeConcat(nonSpreadable, 3, 4, 'foo', Object('bar')),
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[1, 2, 3, 4, 'foo', Object('bar')],
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'a non-concat-spreadable array is spreaded, and a concat-spreadable String is not spreaded'
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);
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st.teardown(mockProperty(Array.prototype, isConcatSpreadable, { value: false }));
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st.deepEqual(
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safeConcat([1, 2], 3, 4, 'foo', Object('bar')),
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[1, 2, 3, 4, 'foo', Object('bar')],
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'all arrays marked non-concat-spreadable are still spreaded, and a concat-spreadable String is not spreaded'
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);
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st.end();
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});
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t.end();
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});
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