updating unit and integration tests

backend/jest.config.js

@@ -1,5 +1,22 @@
 module.exports = {
-  testEnvironment: 'node',
+  projects: [
+    {
+      displayName: 'unit',
+      testEnvironment: 'node',
+      testMatch: ['**/tests/unit/**/*.test.js'],
+      setupFilesAfterEnv: ['<rootDir>/tests/setup.js'],
+      testTimeout: 10000,
+    },
+    {
+      displayName: 'integration',
+      testEnvironment: 'node',
+      testMatch: ['**/tests/integration/**/*.test.js'],
+      setupFilesAfterEnv: ['<rootDir>/tests/integration-setup.js'],
+      testTimeout: 30000,
+    },
+  ],
+  // Run tests sequentially to avoid module cache conflicts between unit and integration tests
+  maxWorkers: 1,
   coverageDirectory: 'coverage',
   collectCoverageFrom: [
     '**/*.js',
@@ -9,10 +26,6 @@ module.exports = {
     '!jest.config.js'
   ],
   coverageReporters: ['text', 'lcov', 'html'],
-  testMatch: ['**/tests/**/*.test.js'],
-  setupFilesAfterEnv: ['<rootDir>/tests/setup.js'],
-  forceExit: true,
-  testTimeout: 10000,
   coverageThreshold: {
     global: {
       lines: 80,