test: setup automated tests with jest

frontend/jest.config.js

@@ -0,0 +1,32 @@
+// Add any custom config to be passed to Jest
+const customJestConfig = {
+  setupFilesAfterEnv: ["<rootDir>/jest.setup.js"],
+  moduleDirectories: ["node_modules", "<rootDir>/"],
+  transform: {
+    // Use babel-jest to transpile tests with the below presets
+    // https://jestjs.io/docs/configuration#transform-objectstring-pathtotransformer--pathtotransformer-object
+    "^.+\\.(js|jsx|ts|tsx)$": [
+      "babel-jest",
+      {
+        presets: [
+          "@babel/preset-env",
+          [
+            "@babel/preset-react",
+            {
+              runtime: "automatic",
+            },
+          ],
+        ],
+      },
+    ],
+  },
+  testEnvironment: "jest-environment-jsdom",
+  moduleNameMapper: {
+    "^uuid$": require.resolve("uuid"),
+    "^@fontsource/roboto$": "identity-obj-proxy",
+    "\\.(png)$": "identity-obj-proxy",
+  },
+  testPathIgnorePatterns: ["<rootDir>/cypress/"],
+};
+
+module.exports = customJestConfig;

frontend/jest.setup.js

@@ -0,0 +1,6 @@
+// Optional: configure or set up a testing framework before each test.
+// If you delete this file, remove `setupFilesAfterEnv` from `jest.config.js`
+
+// Used for __tests__/testing-library.js
+// Learn more: https://github.com/testing-library/jest-dom
+import "@testing-library/jest-dom/extend-expect";

frontend/package.json

@@ -23,12 +23,17 @@
     "styled-components": "^5.3.5"
   },
   "devDependencies": {
+    "@testing-library/jest-dom": "^5.16.5",
+    "@testing-library/react": "12.1.5",
+    "axios-mock-adapter": "^1.21.2",
+    "jest-transform-css": "^6.0.0",
     "source-map-explorer": "^2.5.2"
   },
   "scripts": {
     "start": "BROWSER=none react-scripts start",
     "build": "react-scripts build",
-    "analyze": "source-map-explorer 'build/static/js/*.js'"
+    "analyze": "source-map-explorer 'build/static/js/*.js'",
+    "test:unit": "npx jest --coverage --testPathPattern='unit'"
   },
   "homepage": "/app",
   "proxy": "http://127.0.0.1:4000",