import * as fs from 'node:fs/promises';
import * as path from 'node:path';
import assert from 'node:assert/strict';
import { describe, it } from 'node:test';
import { headFile } from '../../../lib/fs-helpers.js';
import { withFileOpsFixture } from '../fixtures/file-ops-hooks.js';
void describe('headFile edge cases', () => {
withFileOpsFixture((getTestDir) => {
void it('headFile handles requesting more lines than file has', async () => {
const filePath = path.join(getTestDir(), 'multiline.txt');
const handle = await fs.open(filePath, 'r');
try {
const content = await headFile(handle, 200);
const lines = content.split('\n');
assert.strictEqual(lines.length, 100);
} finally {
await handle.close();
}
});
void it('headFile handles empty file', async () => {
const emptyFile = path.join(getTestDir(), 'empty-head.txt');
await fs.writeFile(emptyFile, '');
const handle = await fs.open(emptyFile, 'r');
try {
const content = await headFile(handle, 5);
assert.strictEqual(content, '');
} finally {
await handle.close();
}
await fs.rm(emptyFile);
});
});
});
