smartpreview/test/test.browser.ts

import { expect, tap } from '@git.zone/tstest/tapbundle';
import * as smartpreview from '../ts_web/index.ts';

// Test data - minimal PDF as Uint8Array for browser testing
const createMinimalPdfBuffer = (): Uint8Array => {
  const pdfContent = `%PDF-1.4
1 0 obj
<<
/Type /Catalog
/Pages 2 0 R
>>
endobj

2 0 obj
<<
/Type /Pages
/Kids [3 0 R]
/Count 1
>>
endobj

3 0 obj
<<
/Type /Page
/Parent 2 0 R
/MediaBox [0 0 612 792]
/Resources <<
/Font <<
/F1 4 0 R
>>
>>
/Contents 5 0 R
>>
endobj

4 0 obj
<<
/Type /Font
/Subtype /Type1
/BaseFont /Helvetica
>>
endobj

5 0 obj
<<
/Length 44
>>
stream
BT
/F1 12 Tf
72 720 Td
(Hello World) Tj
ET
endstream
endobj

xref
0 6
0000000000 65535 f 
0000000010 00000 n 
0000000079 00000 n 
0000000136 00000 n 
0000000273 00000 n 
0000000362 00000 n 
trailer
<<
/Size 6
/Root 1 0 R
>>
startxref
456
%%EOF`;
  
  return new TextEncoder().encode(pdfContent);
};

// Create a mock File object for testing
const createMockPdfFile = (): File => {
  const buffer = createMinimalPdfBuffer();
  return new File([buffer], 'test.pdf', { type: 'application/pdf' });
};

tap.test('should check browser compatibility', async () => {
  const compatibility = smartpreview.SmartPreview.getBrowserCompatibility();
  
  expect(compatibility).toHaveProperty('fileApi');
  expect(compatibility).toHaveProperty('webWorkers');
  expect(compatibility).toHaveProperty('offscreenCanvas');
  expect(compatibility).toHaveProperty('isSupported');
  
  expect(typeof compatibility.fileApi).toEqual('boolean');
  expect(typeof compatibility.webWorkers).toEqual('boolean');
  expect(typeof compatibility.offscreenCanvas).toEqual('boolean');
  expect(typeof compatibility.isSupported).toEqual('boolean');
});

tap.test('should create SmartPreview instance', async () => {
  const preview = new smartpreview.SmartPreview();
  expect(preview).toBeInstanceOf(smartpreview.SmartPreview);
});

tap.test('should return supported formats', async () => {
  const preview = new smartpreview.SmartPreview();
  const formats = preview.getSupportedFormats();
  
  expect(formats).toContain('pdf');
  expect(preview.isFormatSupported('pdf')).toEqual(true);
  expect(preview.isFormatSupported('jpg')).toEqual(false);
});

tap.test('should throw error when not initialized', async () => {
  const preview = new smartpreview.SmartPreview();
  const testFile = createMockPdfFile();

  try {
    await preview.generatePreview(testFile);
    expect(true).toEqual(false); // Should not reach here
  } catch (error) {
    expect(error).toBeInstanceOf(smartpreview.PreviewError);
    expect(error.errorType).toEqual('PROCESSING_FAILED');
  }
});

tap.test('should validate input', async () => {
  const preview = new smartpreview.SmartPreview();
  
  try {
    await preview.generatePreview(null as any);
    expect(true).toEqual(false); // Should not reach here
  } catch (error) {
    expect(error).toBeInstanceOf(smartpreview.PreviewError);
    expect(error.errorType).toEqual('PROCESSING_FAILED');
  }
});

tap.test('should handle initialization', async () => {
  const preview = new smartpreview.SmartPreview();
  
  try {
    await preview.init();
    expect(true).toEqual(true); // If we get here, init succeeded
  } catch (error) {
    // Expected if browser APIs are not fully available in test environment
    expect(error).toBeInstanceOf(smartpreview.PreviewError);
  } finally {
    await preview.cleanup();
  }
});

tap.test('should create PreviewError correctly', async () => {
  const error = new smartpreview.PreviewError('INVALID_INPUT', 'Test error message');
  
  expect(error).toBeInstanceOf(Error);
  expect(error).toBeInstanceOf(smartpreview.PreviewError);
  expect(error.errorType).toEqual('INVALID_INPUT');
  expect(error.message).toEqual('Test error message');
  expect(error.name).toEqual('PreviewError');
});

tap.test('should handle different input types', async () => {
  // Test with File
  const file = createMockPdfFile();
  expect(file).toBeInstanceOf(File);
  expect(file.type).toEqual('application/pdf');
  
  // Test with ArrayBuffer
  const buffer = createMinimalPdfBuffer();
  const arrayBuffer = buffer.buffer.slice(buffer.byteOffset, buffer.byteOffset + buffer.byteLength);
  expect(arrayBuffer).toBeInstanceOf(ArrayBuffer);
  
  // Test with Uint8Array
  expect(buffer).toBeInstanceOf(Uint8Array);
});

tap.test('should provide download functionality methods', async () => {
  const preview = new smartpreview.SmartPreview();
  
  // These methods should exist
  expect(typeof preview.createDownloadLink).toEqual('function');
  expect(typeof preview.downloadPreview).toEqual('function');
  expect(typeof preview.generatePreviewFromFile).toEqual('function');
  expect(typeof preview.generatePreviewFromUrl).toEqual('function');
});

tap.test('should create instance via factory method', async () => {
  try {
    const preview = await smartpreview.SmartPreview.create();
    expect(preview).toBeInstanceOf(smartpreview.SmartPreview);
    await preview.cleanup();
  } catch (error) {
    // Expected if browser APIs are not fully available
    expect(error).toBeInstanceOf(smartpreview.PreviewError);
  }
});

export default tap.start();