add validation tests

babel.config.cjs

@@ -0,0 +1,3 @@
+module.exports = {
+	presets: [['@babel/preset-env', { targets: { node: 'current' } }]]
+};

jest-setup.ts

@@ -0,0 +1 @@
+import '@testing-library/jest-dom';

jest.config.cjs

@@ -0,0 +1,18 @@
+module.exports = {
+	transform: {
+		'^.+\\.svelte$': ['svelte-jester', { preprocess: './svelte.config.js' }],
+		'^.+\\.ts$': 'ts-jest',
+		'^.+\\.js$': 'ts-jest'
+	},
+	moduleFileExtensions: ['js', 'ts', 'svelte'],
+	moduleNameMapper: {
+		'^\\$lib(.*)$': '<rootDir>/src/lib$1',
+		'^\\$app(.*)$': [
+			'<rootDir>/.svelte-kit/dev/runtime/app$1',
+			'<rootDir>/.svelte-kit/build/runtime/app$1'
+		]
+	},
+	setupFilesAfterEnv: ['<rootDir>/jest-setup.ts'],
+	collectCoverageFrom: ['src/**/*.{ts,tsx,svelte,js,jsx}'],
+	testEnvironment: 'jsdom'
+};

package.json

@@ -11,30 +11,42 @@
 		"check:watch": "svelte-check --tsconfig ./tsconfig.json --watch",
 		"lint": "prettier --ignore-path .gitignore --check --plugin-search-dir=. . && eslint --ignore-path .gitignore .",
 		"format": "prettier --ignore-path .gitignore --write --plugin-search-dir=. .",
-		"start": "node build/index.js"
+		"start": "node build/index.js",
+		"test": "jest",
+		"test:watch": "npm run test -- --watchAll",
+		"test:coverage": "jest --coverage"
 	},
 	"devDependencies": {
+		"@babel/core": ">=7.13.0 <8.0.0",
+		"@babel/preset-env": "^7.16.11",
 		"@sveltejs/adapter-auto": "next",
 		"@sveltejs/adapter-node": "^1.0.0-next.67",
 		"@sveltejs/kit": "next",
+		"@testing-library/jest-dom": "^5.16.2",
+		"@testing-library/svelte": "^3.0.3",
 		"@types/better-sqlite3": "^7.4.2",
+		"@types/jest": "^27.4.0",
 		"@typescript-eslint/eslint-plugin": "^4.31.1",
 		"@typescript-eslint/parser": "^4.31.1",
 		"autoprefixer": "^10.4.2",
+		"babel": "^6.23.0",
 		"eslint": "^7.32.0",
 		"eslint-config-prettier": "^8.3.0",
 		"eslint-plugin-svelte3": "^3.2.1",
+		"jest": "^27.5.1",
 		"postcss": "^8.4.5",
 		"prettier": "^2.4.1",
 		"prettier-plugin-svelte": "^2.4.0",
 		"prettier-plugin-tailwindcss": "^0.1.4",
 		"svelte": "^3.44.0",
 		"svelte-check": "^2.2.6",
 		"svelte-hero-icons": "^4.0.3",
+		"svelte-jester": "^2.3.1",
 		"svelte-notifications": "^0.9.93",
 		"svelte-preprocess": "^4.9.4",
 		"tailwindcss": "^3.0.15",
 		"tailwindcss-safe-area": "^0.2.2",
+		"ts-jest": "^27.1.3",
 		"tslib": "^2.3.1",
 		"typescript": "^4.4.3"
 	},