47 lines
1.3 KiB
JavaScript
47 lines
1.3 KiB
JavaScript
/* eslint-disable space-before-function-paren, no-var, padded-blocks */
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require('extensions/array');
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(function() {
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describe('Array extensions', function() {
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describe('first', function() {
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return it('returns the first item', function() {
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var arr;
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arr = [0, 1, 2, 3, 4, 5];
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return expect(arr.first()).toBe(0);
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});
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});
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describe('last', function() {
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return it('returns the last item', function() {
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var arr;
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arr = [0, 1, 2, 3, 4, 5];
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return expect(arr.last()).toBe(5);
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});
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});
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describe('find', function () {
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beforeEach(() => {
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this.arr = [0, 1, 2, 3, 4, 5];
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});
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it('returns the item that first passes the predicate function', () => {
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expect(this.arr.find(item => item === 2)).toBe(2);
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});
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it('returns undefined if no items pass the predicate function', () => {
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expect(this.arr.find(item => item === 6)).not.toBeDefined();
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});
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it('error when called on undefined or null', () => {
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expect(Array.prototype.find.bind(undefined, item => item === 1)).toThrow();
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expect(Array.prototype.find.bind(null, item => item === 1)).toThrow();
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});
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it('error when predicate is not a function', () => {
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expect(Array.prototype.find.bind(this.arr, 1)).toThrow();
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});
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});
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});
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}).call(this);
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