Add jest test framework to explorer

Author: Alenar

mithril-explorer/Makefile

@@ -26,4 +26,5 @@ clean:
 upgrade: clean install
 	yarn upgrade next@latest react@latest react-bootstrap@latest react-dom@latest bootstrap@latest \
 	     bootstrap-icons@latest eslint@latest eslint-config-next@latest @reduxjs/toolkit@latest \
-	     next-redux-wrapper@latest react-redux@latest
+	     next-redux-wrapper@latest react-redux@latest @popperjs/core@latest \
+	     jest@latest jest-environment-jsdom@latest @testing-library/react@latest @testing-library/jest-dom@latest

mithril-explorer/__tests__/store.test.js

@@ -0,0 +1,20 @@
+// jest.config.js
+const nextJest = require('next/jest')
+
+const createJestConfig = nextJest({
+  // Provide the path to your Next.js app to load next.config.js and .env files in your test environment
+  dir: './',
+})
+
+// Add any custom config to be passed to Jest
+/** @type {import('jest').Config} */
+const customJestConfig = {
+  // Add more setup options before each test is run
+  // setupFilesAfterEnv: ['<rootDir>/jest.setup.js'],
+  // if using TypeScript with a baseUrl set to the root directory then you need the below for alias' to work
+  moduleDirectories: ['node_modules', '<rootDir>/'],
+  testEnvironment: 'jest-environment-jsdom',
+}
+
+// createJestConfig is exported this way to ensure that next/jest can load the Next.js config which is async
+module.exports = createJestConfig(customJestConfig)

mithril-explorer/jest.config.js

@@ -6,9 +6,12 @@
     "dev": "next dev",
     "build": "next build && next export",
     "start": "next start",
-    "lint": "next lint"
+    "lint": "next lint",
+    "test": "jest --watch",
+    "test:ci": "jest --ci"
   },
   "dependencies": {
+    "@popperjs/core": "^2.11.6",
     "@reduxjs/toolkit": "^1.9.0",
     "bootstrap": "^5.2.2",
     "bootstrap-icons": "^1.9.1",
@@ -20,7 +23,11 @@
     "react-redux": "^8.0.5"
   },
   "devDependencies": {
+    "@testing-library/jest-dom": "^5.16.5",
+    "@testing-library/react": "^13.4.0",
     "eslint": "^8.27.0",
-    "eslint-config-next": "^13.0.2"
+    "eslint-config-next": "^13.0.2",
+    "jest": "^29.3.1",
+    "jest-environment-jsdom": "^29.3.1"
   }
 }