Intlayer

import { describe, expect, it } from 'vitest'; import { getChunk } from './getChunk'; // Sample multiline string used across test cases const sampleText = [ 'Line 0: The quick brown fox jumps over the lazy dog.', 'Line 1: Pack my box with five dozen liquor jugs.', 'Line 2: How razorback-jumping frogs can level six piqued gymnasts!', 'Line 3: Cozy lummox gives smart squid who asks for job pen.', 'Line 4: A mad boxer shot a quick, gloved jab to the jaw of his dizzy opponent.', ].join('\n'); describe('getChunk', () => { it('returns the whole text when no filters are provided', () => { const result = getChunk(sampleText); expect(result).toBe(sampleText); }); it('applies lineStart and lineLength filters', () => { const result = getChunk(sampleText, { lineStart: 1, lineLength: 2 }); // Expected substring is lines 1 and 2 plus the newline in-between const expected = [ 'Line 1: Pack my box with five dozen liquor jugs.\n', 'Line 2: How razorback-jumping frogs can level six piqued gymnasts!\n', ].join(''); expect(result).toBe(expected); }); it('applies charStart and charLength filters', () => { // Grab substring "quick brown fox" from first line const charStart = sampleText.indexOf('quick'); const charLength = 'quick brown fox'.length; const result = getChunk(sampleText, { charStart, charLength }); expect(result).toBe('quick brown fox'); }); it('combines line and char filters by intersecting their ranges', () => { // Restrict to lines 0-2, then further to characters within those lines const partial = getChunk(sampleText, { lineStart: 0, lineLength: 3, // lines 0, 1, 2 // Grab only the first 10 characters of the selected block charStart: 0, charLength: 10, }); expect(partial).toBe('Line 0: Th'); }); it('returns an empty string when effectiveStart > effectiveEnd', () => { const result = getChunk(sampleText, { charStart: 10, charLength: 0 }); expect(result).toBe(''); }); });