feat: add prisma-mock for enhanced testing with Prisma client

Author: AdityaDRathore

backend/src/tests/prisma-mock.ts

@@ -0,0 +1,11 @@
+import { PrismaClient } from '@prisma/client';
+import { mockDeep, mockReset, DeepMockProxy } from 'jest-mock-extended';
+
+// Create a mock instance of the Prisma client
+export const prisma = mockDeep<PrismaClient>();
+
+// Factory for creating a fresh mock for each test
+export const createMockPrismaClient = (): DeepMockProxy<PrismaClient> => {
+  mockReset(prisma);
+  return prisma;
+};