mirror of
https://github.com/bookorbit/bookorbit.git
synced 2026-11-03 08:21:39 -06:00
neon
82 lines
3.4 KiB
TypeScript
82 lines
3.4 KiB
TypeScript
import { mkdtemp, rm, writeFile } from 'fs/promises';
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import { join } from 'path';
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import { tmpdir } from 'os';
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import { fingerprintFile } from './hash';
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const EMPTY_MD5 = 'd41d8cd98f00b204e9800998ecf8427e';
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// 1 KB = 1024 bytes. The first read position is BASE (1024), so files <= 1024 bytes produce empty hash.
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const FIRST_READ_POSITION = 1024;
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let tmpDir: string;
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beforeEach(async () => {
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tmpDir = await mkdtemp(join(tmpdir(), 'scanner-hash-'));
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});
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afterEach(async () => {
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await rm(tmpDir, { recursive: true, force: true });
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});
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// ── SMALL FILES ───────────────────────────────────────────────────────────────
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describe('files smaller than the first read position', () => {
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it('returns MD5 of empty string for a file with 0 bytes', async () => {
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await writeFile(join(tmpDir, 'empty.epub'), Buffer.alloc(0));
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const hash = await fingerprintFile(join(tmpDir, 'empty.epub'));
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expect(hash).toBe(EMPTY_MD5);
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});
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it('returns MD5 of empty string for a file with exactly 1024 bytes', async () => {
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// Position 1024 >= size 1024 → no read
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await writeFile(join(tmpDir, 'exact.epub'), Buffer.alloc(FIRST_READ_POSITION, 'A'));
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const hash = await fingerprintFile(join(tmpDir, 'exact.epub'));
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expect(hash).toBe(EMPTY_MD5);
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});
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});
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// ── FILES LARGE ENOUGH TO BE SAMPLED ─────────────────────────────────────────
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describe('files large enough for sampling', () => {
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it('returns a 32-char hex string (MD5)', async () => {
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await writeFile(join(tmpDir, 'book.epub'), Buffer.alloc(2048, 'A'));
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const hash = await fingerprintFile(join(tmpDir, 'book.epub'));
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expect(hash).toMatch(/^[0-9a-f]{32}$/);
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});
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it('identical content produces identical fingerprint', async () => {
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const content = Buffer.alloc(4096, 'Z');
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await writeFile(join(tmpDir, 'a.epub'), content);
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await writeFile(join(tmpDir, 'b.epub'), content);
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const [h1, h2] = await Promise.all([fingerprintFile(join(tmpDir, 'a.epub')), fingerprintFile(join(tmpDir, 'b.epub'))]);
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expect(h1).toBe(h2);
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});
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it('different content at sampled position produces different fingerprint', async () => {
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const base = Buffer.alloc(4096, 'A');
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const different = Buffer.from(base);
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different.write('Z', FIRST_READ_POSITION, 'ascii'); // change byte at the sampled position
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await writeFile(join(tmpDir, 'a.epub'), base);
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await writeFile(join(tmpDir, 'b.epub'), different);
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const [h1, h2] = await Promise.all([fingerprintFile(join(tmpDir, 'a.epub')), fingerprintFile(join(tmpDir, 'b.epub'))]);
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expect(h1).not.toBe(h2);
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});
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it('fingerprint is deterministic across calls', async () => {
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await writeFile(join(tmpDir, 'book.epub'), Buffer.alloc(8192, 'X'));
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const [h1, h2] = await Promise.all([fingerprintFile(join(tmpDir, 'book.epub')), fingerprintFile(join(tmpDir, 'book.epub'))]);
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expect(h1).toBe(h2);
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});
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});
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// ── ERROR HANDLING ────────────────────────────────────────────────────────────
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describe('error handling', () => {
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it('throws when the file does not exist', async () => {
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await expect(fingerprintFile(join(tmpDir, 'nonexistent.epub'))).rejects.toThrow();
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});
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});
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