Creating Jest config and setup file (#4141)

* Create jest.config.js

* Create jest.setup.js

jest.config.js

@@ -0,0 +1,29 @@
+module.exports = {
+    // Use jsdom to simulate a browser environment
+    testEnvironment: 'jest-environment-jsdom',
+
+    // Specify where Jest should look for test files
+    testMatch: ['**/?(*.)+(spec|test).[jt]s?(x)'],
+
+    // Transform JavaScript files using Babel (if needed)
+    transform: {
+        '^.+\\.jsx?$': 'babel-jest',
+    },
+
+    // Clear mocks between tests for isolation
+    clearMocks: true,
+
+    // Collect coverage information and specify the directory
+    collectCoverage: true,
+    coverageDirectory: 'coverage',
+
+    // Specify file extensions Jest will process
+    moduleFileExtensions: ['js', 'jsx', 'json', 'node'],
+
+    // Define any global variables for the tests
+    globals: {
+        'window': {},
+    },
+    // Set up files to run before tests (e.g., polyfills, setup scripts)
+    setupFiles: ['./jest.setup.js'], // Optional, if you have a setup file
+};

jest.setup.js

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+// A jest.setup.js file is used to run setup code before your tests are executed.