barcode-tool/src/components/detectBarcode/detectBarcode.test.ts

lightweight npm package that facilitates barcode generation and detection. It leverages the Barcode Detection API for barcode scanning directly in web browsers and provides an intuitive interface for generating various barcode formats. Seamlessly integrat

import { detectBarcode, DetectBarcodeParams, Barcode } from './detectBarcode'; // Import the function and types from your module

describe('detectBarcode', () => {
    it('should detect barcodes', async() => {
        // Mock BarcodeDetector class
        class MockBarcodeDetector {
            async detect(): Promise<any[]> {
                // Mock implementation
                return [
                    { format: 'code128', rawValue: '123456789' },
                    { format: 'qr', rawValue: 'https://example.com' },
                ];
            }
        }

        // Assign the mock implementation to window
        (window as any).BarcodeDetector = MockBarcodeDetector;

        const image = document.createElement('img');
        const formats = ['code128', 'qr'];
        const params: DetectBarcodeParams = { image, formats };

        const barcodes: Barcode[] = await detectBarcode(params);

        expect(barcodes).toHaveLength(2);
        expect(barcodes[0].format).toBe('code128');
        expect(barcodes[0].rawValue).toBe('123456789');
        expect(barcodes[1].format).toBe('qr');
        expect(barcodes[1].rawValue).toBe('https://example.com');
    });

    it('should throw an error if Barcode Detection API is not supported', async() => {
        // Mocking BarcodeDetector not supported in window
        delete (window as any).BarcodeDetector;

        const image = document.createElement('img');
        const formats = ['code128', 'qr'];
        const params: DetectBarcodeParams = { image, formats };

        await expect(detectBarcode(params)).rejects.toThrow('Barcode Detection API is not supported in this browser');
    });

    it('should throw an error if image property is not provided', async() => {
        const formats = ['code128', 'qr'];
        const params: DetectBarcodeParams = { image: undefined, formats };

        await expect(detectBarcode(params)).rejects.toThrow('image property is not provided');
    });
});