add changes

backend/jest.config.js

@@ -0,0 +1,29 @@
+module.exports = {
+  testEnvironment: 'node',
+  coverageDirectory: 'coverage',
+  collectCoverageFrom: [
+    'controllers/**/*.js',
+    'middleware/**/*.js',
+    'models/**/*.js',
+    'routes/**/*.js',
+    '!models/index.js',
+    '!**/node_modules/**'
+  ],
+  coverageThreshold: {
+    global: {
+      branches: 70,
+      functions: 70,
+      lines: 70,
+      statements: 70
+    }
+  },
+  testMatch: [
+    '**/tests/**/*.test.js',
+    '**/__tests__/**/*.js'
+  ],
+  verbose: true,
+  forceExit: true,
+  clearMocks: true,
+  resetMocks: true,
+  restoreMocks: true
+};