Create concatInitDataIdAndCertificate.test.ts

Signed-off-by: Agajan Jumakuliyev <agajan.tm@gmail.com>

lib/test/drm/fairplay/concatInitDataIdAndCertificate.test.ts

@@ -0,0 +1,33 @@
+import { concatInitDataIdAndCertificate } from '@svta/common-media-library/drm/fairplay/concatInitDataIdAndCertificate';
+import { base64decode } from '@svta/common-media-library/utils/base64decode';
+import { deepStrictEqual } from 'node:assert';
+import { describe, it } from 'node:test';
+
+// initData and CKC appCertData from Apple's FairPlay example
+const mockInitDataBase64 = `AAAAAgAAAACIiMWpQhMDI6pMnx2nfIiIMoaz9xQolnPlrBsRFKyANk3mGrJ0R1rb476dlbP7gfY5RHrSdUdvEMIMIbCl3hrGj96RIuGb4MDZqIWAo2FGwODnjP7FqW00fMY9kWRiTPngKU3dY3agBnZ8glOEskarDrEQak`;
+const mockAppCertDataBase64 = `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`;
+
+const initData = base64decode(mockInitDataBase64);
+const appCertData = base64decode(mockAppCertDataBase64);
+const contentId = new TextEncoder().encode('skd://svta.com/content1234');
+
+describe('concatInitDataIdAndCertificate', () => {
+	it('concatenates initData, id, and certificate correctly', () => {
+		const result = concatInitDataIdAndCertificate(initData, contentId, appCertData);
+
+		// It should be 8-bit integer type and contain data
+		deepStrictEqual(result instanceof Uint8Array, true);
+		deepStrictEqual(result.length > 0, true); 
+	});
+
+	it('handles empty certificate and id correctly', () => {
+		const id = '';
+		const cert = new Uint8Array([]);
+		const result = concatInitDataIdAndCertificate(initData, id, cert);
+
+		// Length should account for added ID and cert size and 
+		// first part should match initData
+		deepStrictEqual(result.length, initData.byteLength + 4 + 4); 
+		deepStrictEqual(result.slice(0, initData.byteLength), new Uint8Array(initData));
+	});
+});