test(auth): add unit tests for various guards and services with mocked dependencies

backend/src/media/media.service.spec.ts

@@ -96,4 +96,37 @@ describe("MediaService", () => {
 			expect(result.buffer).toEqual(Buffer.from("processed-video"));
 		});
 	});
+
+	describe("scanFile", () => {
+		it("should return false if clamav not initialized", async () => {
+			const result = await service.scanFile(Buffer.from(""), "test.txt");
+			expect(result.isInfected).toBe(false);
+		});
+
+		it("should handle virus detection", async () => {
+			// Mock private property to simulate initialized clamscan
+			(service as any).isClamAvInitialized = true;
+			(service as any).clamscan = {
+				scanStream: jest.fn().mockResolvedValue({
+					isInfected: true,
+					viruses: ["Eicar-Test-Signature"],
+				}),
+			};
+
+			const result = await service.scanFile(Buffer.from(""), "test.txt");
+			expect(result.isInfected).toBe(true);
+			expect(result.virusName).toBe("Eicar-Test-Signature");
+		});
+
+		it("should handle scan error", async () => {
+			(service as any).isClamAvInitialized = true;
+			(service as any).clamscan = {
+				scanStream: jest.fn().mockRejectedValue(new Error("Scan failed")),
+			};
+
+			await expect(
+				service.scanFile(Buffer.from(""), "test.txt"),
+			).rejects.toThrow();
+		});
+	});
 });