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88 lines
2.9 KiB
88 lines
2.9 KiB
4 weeks ago
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describe('matchAt', function () {
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var matchAt;
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beforeEach(function () {
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matchAt = require('../matchAt.js');
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});
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it('matches a simple regex', function () {
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expect(matchAt(/l/, 'hello', 0)).toBe(null);
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expect(matchAt(/l/, 'hello', 1)).toBe(null);
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expect(matchAt(/l/, 'hello', 4)).toBe(null);
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expect(matchAt(/l/, 'hello', 5)).toBe(null);
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var match = matchAt(/l/, 'hello', 2);
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expect(Array.isArray(match)).toBe(true);
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expect(match.index).toBe(2);
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expect(match.input).toBe('hello');
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expect(match[0]).toBe('l');
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expect(match[1]).toBe(undefined);
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expect(match.length).toBe(1);
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var match = matchAt(/l/, 'hello', 3);
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expect(Array.isArray(match)).toBe(true);
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expect(match.index).toBe(3);
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expect(match.input).toBe('hello');
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expect(match[0]).toBe('l');
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expect(match[1]).toBe(undefined);
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expect(match.length).toBe(1);
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});
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it('matches a zero-length regex', function () {
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expect(matchAt(/(?=l)/, 'hello', 0)).toBe(null);
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expect(matchAt(/(?=l)/, 'hello', 1)).toBe(null);
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expect(matchAt(/(?=l)/, 'hello', 4)).toBe(null);
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expect(matchAt(/(?=l)/, 'hello', 5)).toBe(null);
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var match = matchAt(/(?=l)/, 'hello', 2);
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expect(Array.isArray(match)).toBe(true);
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expect(match.index).toBe(2);
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expect(match.input).toBe('hello');
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expect(match[0]).toBe('');
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expect(match[1]).toBe(undefined);
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expect(match.length).toBe(1);
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var match = matchAt(/(?=l)/, 'hello', 3);
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expect(Array.isArray(match)).toBe(true);
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expect(match.index).toBe(3);
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expect(match.input).toBe('hello');
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expect(match[0]).toBe('');
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expect(match[1]).toBe(undefined);
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expect(match.length).toBe(1);
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});
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it('matches a regex with capturing groups', function () {
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expect(matchAt(/(l)(l)?/, 'hello', 0)).toBe(null);
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expect(matchAt(/(l)(l)?/, 'hello', 1)).toBe(null);
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expect(matchAt(/(l)(l)?/, 'hello', 4)).toBe(null);
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expect(matchAt(/(l)(l)?/, 'hello', 5)).toBe(null);
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var match = matchAt(/(l)(l)?/, 'hello', 2);
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expect(Array.isArray(match)).toBe(true);
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expect(match.index).toBe(2);
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expect(match.input).toBe('hello');
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expect(match[0]).toBe('ll');
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expect(match[1]).toBe('l');
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expect(match[2]).toBe('l');
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expect(match.length).toBe(3);
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var match = matchAt(/(l)(l)?/, 'hello', 3);
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expect(Array.isArray(match)).toBe(true);
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expect(match.index).toBe(3);
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expect(match.input).toBe('hello');
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expect(match[0]).toBe('l');
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expect(match[1]).toBe('l');
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expect(match[2]).toBe(undefined);
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expect(match.length).toBe(3);
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});
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it('copies flags over', function () {
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expect(matchAt(/L/i, 'hello', 0)).toBe(null);
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expect(matchAt(/L/i, 'hello', 1)).toBe(null);
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expect(matchAt(/L/i, 'hello', 2)).not.toBe(null);
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expect(matchAt(/L/i, 'hello', 3)).not.toBe(null);
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expect(matchAt(/L/i, 'hello', 4)).toBe(null);
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expect(matchAt(/L/i, 'hello', 5)).toBe(null);
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});
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});
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