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 { readFile } from '../../../lib/fs-helpers.js';
import { withFileOpsFixture } from '../fixtures/file-ops-hooks.js';
void describe('readFile edge cases', () => {
withFileOpsFixture((getTestDir) => {
void it('readFile head read is not truncated when file is shorter than head', async () => {
const result = await readFile(path.join(getTestDir(), 'multiline.txt'), {
head: 200,
});
assert.ok(result.content.includes('Line 100'));
assert.strictEqual(result.truncated, false);
assert.strictEqual(result.hasMoreLines, false);
});
void it('readFile range without endLine reports hasMoreLines when truncated by size', async () => {
const result = await readFile(path.join(getTestDir(), 'multiline.txt'), {
startLine: 1,
maxSize: 32,
});
assert.strictEqual(result.readMode, 'range');
assert.strictEqual(result.startLine, 1);
assert.strictEqual(result.endLine, undefined);
assert.strictEqual(result.truncated, true);
assert.strictEqual(result.hasMoreLines, true);
});
void it('readFile handles empty file', async () => {
const emptyFile = path.join(getTestDir(), 'empty-read.txt');
await fs.writeFile(emptyFile, '');
const result = await readFile(emptyFile);
assert.strictEqual(result.content, '');
assert.strictEqual(result.truncated, false);
await fs.rm(emptyFile);
});
void it('readFile rejects binary files without suggesting unsupported tool options', async () => {
const binaryFile = path.join(getTestDir(), 'image.png');
await assert.rejects(
readFile(binaryFile, { skipBinary: true }),
(error: unknown) => {
assert.ok(error instanceof Error);
assert.ok(error.message.includes('Binary file detected'));
assert.ok(!error.message.includes('skipBinary'));
return true;
}
);
});
});
});
