chore: added the tests

Author: mridang

README.md

@@ -131,14 +131,16 @@ Complete logout implementation that properly terminates both the local session a
 ```javascript
 import helmet from 'helmet';
 
-app.use(helmet({
-  contentSecurityPolicy: {
-    directives: {
-      defaultSrc: ["'self'"],
-      scriptSrc: ["'self'", "'unsafe-eval'", "'unsafe-inline'"],
+app.use(
+  helmet({
+    contentSecurityPolicy: {
+      directives: {
+        defaultSrc: ["'self'"],
+        scriptSrc: ["'self'", "'unsafe-eval'", "'unsafe-inline'"],
+      },
     },
-  },
-}));
+  }),
+);
 ```
 
 At minimum, configure:

eslint.config.mjs

@@ -25,4 +25,20 @@ export default [
       ...tsPlugin.configs.recommended.rules,
     },
   },
+  {
+    files: [
+      '**/*.test.ts',
+      '**/*.test.js',
+      '**/*.spec.ts',
+      '**/*.spec.js',
+      'test/**/*.ts',
+      'test/**/*.js',
+    ],
+    languageOptions: {
+      globals: {
+        ...globals.jest,
+        ...globals.node,
+      },
+    },
+  },
 ];

jest.config.mjs

@@ -0,0 +1,47 @@
+export default {
+  preset: 'ts-jest/presets/default-esm',
+  transform: {
+    '^.+\\.m?[tj]sx?$': [
+      'ts-jest',
+      {
+        useESM: true,
+        tsconfig: 'tsconfig.jest.json',
+      },
+    ],
+  },
+  testEnvironment: 'node',
+  testMatch: ['**/*.+(spec|test).[tj]s?(x)'],
+  moduleFileExtensions: [
+    'ts',
+    'tsx',
+    'js',
+    'mjs',
+    'jsx',
+    'mts',
+    'json',
+    'node',
+  ],
+  testPathIgnorePatterns: ['/node_modules/', '/frontend/', '/dist/'],
+  resetModules: false,
+  collectCoverage: true,
+  coverageDirectory: './build/coverage',
+  collectCoverageFrom: ['src/**/*.{ts,tsx,js,jsx}', '!src/**/*.d.ts'],
+  coverageReporters: ['clover', 'cobertura', 'lcov'],
+  coveragePathIgnorePatterns: ['/dist/', '/node_modules/'],
+  testTimeout: 60000,
+  globalSetup: './test/setup.js',
+  extensionsToTreatAsEsm: ['.ts', '.tsx', '.mts'],
+  moduleNameMapper: {
+    '^(\\.{1,2}/.*)\\.js$': '$1',
+  },
+  reporters: [
+    'default',
+    [
+      'jest-junit',
+      {
+        outputDirectory: './build/reports',
+        outputName: 'junit.xml',
+      },
+    ],
+  ],
+};

knip.config.js

@@ -1,3 +1,4 @@
+// eslint-disable-next-line no-undef
 module.exports = {
   ignoreDependencies: ['handlebars'],
 };