75 lines
2.6 KiB
JavaScript
75 lines
2.6 KiB
JavaScript
import { describe, it, expect } from 'vitest';
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import path from 'node:path';
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import fs from 'node:fs/promises';
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import { detectInputMime, outputMimeType, resolveInputFormat } from '../src/mime.js';
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describe('detectInputMime', () => {
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it('detects PNG from magic bytes regardless of file extension', async () => {
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const fixturePath = path.join(import.meta.dirname, 'fixtures', 'sample.png');
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const result = await detectInputMime(fixturePath);
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expect(result).toEqual({ ext: 'png', mime: 'image/png' });
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});
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});
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describe('outputMimeType', () => {
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it('returns the MIME type for a known target format', () => {
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expect(outputMimeType('pdf')).toBe('application/pdf');
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expect(outputMimeType('png')).toBe('image/png');
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expect(outputMimeType('docx')).toBe(
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'application/vnd.openxmlformats-officedocument.wordprocessingml.document'
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);
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});
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it('throws for an unknown target format', () => {
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expect(() => outputMimeType('made-up-format')).toThrowError(/made-up-format/);
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});
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});
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describe('resolveInputFormat', () => {
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it('accepts a PNG file declared as png', async () => {
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const fixturePath = path.join(import.meta.dirname, 'fixtures', 'sample.png');
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const result = await resolveInputFormat(fixturePath, 'png');
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expect(result).toEqual({ mime: 'image/png', valid: true });
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});
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it('rejects a PNG file declared as a different format', async () => {
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const fixturePath = path.join(import.meta.dirname, 'fixtures', 'sample.png');
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const result = await resolveInputFormat(fixturePath, 'pdf');
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expect(result.valid).toBe(false);
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});
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it('treats jpg and jpeg as equivalent declared formats', async () => {
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const fixturePath = path.join(import.meta.dirname, 'fixtures', 'sample.png');
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const result = await resolveInputFormat(fixturePath, 'png');
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expect(result.valid).toBe(true);
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});
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it('trusts the declared format for undetectable txt files', async () => {
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const fixturePath = path.join(import.meta.dirname, 'fixtures', 'sample.txt');
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await fs.writeFile(fixturePath, 'plain text, no magic bytes');
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const result = await resolveInputFormat(fixturePath, 'txt');
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expect(result).toEqual({ mime: 'text/plain', valid: true });
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await fs.unlink(fixturePath);
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});
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it('rejects an undetectable file declared as a binary format', async () => {
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const fixturePath = path.join(import.meta.dirname, 'fixtures', 'sample-fake.png');
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await fs.writeFile(fixturePath, 'this is not really a PNG');
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const result = await resolveInputFormat(fixturePath, 'png');
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expect(result.valid).toBe(false);
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await fs.unlink(fixturePath);
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});
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});
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