feat: frontend unit tests

frontend/jest.config.js

@@ -0,0 +1,9 @@
+/** @type {import("jest").Config} **/
+module.exports = {
+    testEnvironment: 'jsdom',
+    transform: {
+        '^.+\\.tsx?$': 'ts-jest',
+        '^.+\\.jsx?$': 'babel-jest',
+    },
+    collectCoverageFrom: ['src/**'],
+};