50 lines
1.6 KiB
JavaScript
50 lines
1.6 KiB
JavaScript
'use strict';
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/**
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* Tests for splitLines in src/lines.js.
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*
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* Run with: node --test
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* (or) node --test test/lines.test.js
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*
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* The helper must count lines the way editors and `wc -l` do: a trailing
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* newline terminates the final line rather than starting an extra empty one.
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*/
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import test from 'node:test';
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import assert from 'node:assert/strict';
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import { splitLines } from '../src/lines.js';
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test('splitLines: empty file has no lines', () => {
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assert.deepEqual(splitLines(''), []);
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});
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test('splitLines: no trailing newline is unchanged', () => {
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assert.deepEqual(splitLines('a\nb\nc'), ['a', 'b', 'c']);
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});
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test('splitLines: trailing newline does not add a phantom line', () => {
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// The reported bug: this used to yield 4 elements (['a','b','c','']).
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assert.deepEqual(splitLines('a\nb\nc\n'), ['a', 'b', 'c']);
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assert.equal(splitLines('a\nb\nc\n').length, 3);
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});
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test('splitLines: terminated and non-terminated agree on line count', () => {
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assert.equal(splitLines('a\nb\nc\n').length, splitLines('a\nb\nc').length);
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});
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test('splitLines: a real trailing blank line is preserved', () => {
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assert.deepEqual(splitLines('a\n\n'), ['a', '']);
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assert.equal(splitLines('a\n\n').length, 2);
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});
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test('splitLines: a lone newline is one empty line', () => {
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assert.deepEqual(splitLines('\n'), ['']);
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assert.equal(splitLines('\n').length, 1);
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});
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test('splitLines: multiple trailing newlines keep the real blank lines', () => {
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assert.deepEqual(splitLines('a\n\n\n'), ['a', '', '']);
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assert.equal(splitLines('a\n\n\n').length, 3);
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});
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