diff --git a/.prettierrc.json b/.prettierrc.json
new file mode 100644
index 0000000..812aa7f
--- /dev/null
+++ b/.prettierrc.json
@@ -0,0 +1,9 @@
+{
+	"$schema": "https://json.schemastore.org/prettierrc",
+	"semi": true,
+	"tabWidth": 4,
+	"singleQuote": false,
+	"printWidth": 150,
+	"trailingComma": "none",
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+}
diff --git a/package-lock.json b/package-lock.json
index faa62a1..69b902a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -7,12 +7,255 @@
     "": {
       "name": "code-crispies",
       "version": "1.0.0",
-      "license": "MIT",
+      "license": "Copyright Michael Czechowski 2025",
+      "dependencies": {
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+      "license": "MIT"
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+      "license": "Apache-2.0",
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+      "license": "MIT",
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
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+      }
+    },
+    "node_modules/@csstools/color-helpers": {
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+      "resolved": "https://registry.npmjs.org/@csstools/color-helpers/-/color-helpers-5.0.2.tgz",
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+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
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+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT-0",
+      "engines": {
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+      }
+    },
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+      "dev": true,
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+          "url": "https://github.com/sponsors/csstools"
+        },
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+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
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+      }
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+          "url": "https://github.com/sponsors/csstools"
+        },
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+        "@csstools/css-tokenizer": "^3.0.3"
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+      "dev": true,
+      "funding": [
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+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
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+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "@csstools/css-tokenizer": "^3.0.3"
+      }
+    },
+    "node_modules/@csstools/css-tokenizer": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/@csstools/css-tokenizer/-/css-tokenizer-3.0.3.tgz",
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+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/@esbuild/aix-ppc64": {
       "version": "0.25.4",
       "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.25.4.tgz",
@@ -81,6 +324,69 @@
         "node": ">=18"
       }
     },
+    "node_modules/@isaacs/cliui": {
+      "version": "8.0.2",
+      "resolved": "https://registry.npmjs.org/@isaacs/cliui/-/cliui-8.0.2.tgz",
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+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "string-width": "^5.1.2",
+        "string-width-cjs": "npm:string-width@^4.2.0",
+        "strip-ansi": "^7.0.1",
+        "strip-ansi-cjs": "npm:strip-ansi@^6.0.1",
+        "wrap-ansi": "^8.1.0",
+        "wrap-ansi-cjs": "npm:wrap-ansi@^7.0.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@istanbuljs/schema": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/@istanbuljs/schema/-/schema-0.1.3.tgz",
+      "integrity": "sha512-ZXRY4jNvVgSVQ8DL3LTcakaAtXwTVUxE81hslsyD2AtoXW/wVob10HkOJ1X/pAlcI7D+2YoZKg5do8G/w6RYgA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/@jridgewell/gen-mapping": {
+      "version": "0.3.8",
+      "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.8.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
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+        "@jridgewell/sourcemap-codec": "^1.4.10",
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+      "engines": {
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+      "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.2.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.0.0"
+      }
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+    "node_modules/@jridgewell/set-array": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/@jridgewell/set-array/-/set-array-1.2.1.tgz",
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+      "dev": true,
+      "license": "MIT",
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       "version": "1.5.0",
       "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.5.0.tgz",
@@ -88,6 +394,28 @@
       "dev": true,
       "license": "MIT"
     },
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+      "resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.25.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/resolve-uri": "^3.1.0",
+        "@jridgewell/sourcemap-codec": "^1.4.14"
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+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "engines": {
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+      }
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     "node_modules/@rollup/rollup-android-arm-eabi": {
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       "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm-eabi/-/rollup-android-arm-eabi-4.40.2.tgz",
@@ -368,6 +696,75 @@
         "win32"
       ]
     },
+    "node_modules/@testing-library/dom": {
+      "version": "10.4.0",
+      "resolved": "https://registry.npmjs.org/@testing-library/dom/-/dom-10.4.0.tgz",
+      "integrity": "sha512-pemlzrSESWbdAloYml3bAJMEfNh1Z7EduzqPKprCH5S341frlpYnUEW0H72dLxa6IsYr+mPno20GiSm+h9dEdQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/code-frame": "^7.10.4",
+        "@babel/runtime": "^7.12.5",
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+        "aria-query": "5.3.0",
+        "chalk": "^4.1.0",
+        "dom-accessibility-api": "^0.5.9",
+        "lz-string": "^1.5.0",
+        "pretty-format": "^27.0.2"
+      },
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
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+        "aria-query": "^5.0.0",
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+      "license": "MIT",
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+        "supports-color": "^7.1.0"
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+      "dev": true,
+      "license": "MIT"
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@@ -387,6 +784,39 @@
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+      "dev": true,
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+      "integrity": "sha512-iq6eVVI64nQQTRYq2KtEg2d2uU7LElhTJwsH4YzIHZshxlgZms/wIc4VoDQTlG/IvVIrBKG06CrZnp0qv7hkcQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/strip-ansi?sponsor=1"
+      }
+    },
+    "node_modules/strip-ansi-cjs": {
+      "name": "strip-ansi",
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/strip-ansi/node_modules/ansi-regex": {
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-6.1.0.tgz",
+      "integrity": "sha512-7HSX4QQb4CspciLpVFwyRe79O3xsIZDDLER21kERQ71oaPodF8jL725AgJMFAYbooIqolJoRLuM81SpeUkpkvA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-regex?sponsor=1"
+      }
+    },
+    "node_modules/strip-indent": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/strip-indent/-/strip-indent-3.0.0.tgz",
+      "integrity": "sha512-laJTa3Jb+VQpaC6DseHhF7dXVqHTfJPCRDaEbid/drOhgitgYku/letMUqOXFoWV0zIIUbjpdH2t+tYj4bQMRQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "min-indent": "^1.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/supports-color": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+      "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "has-flag": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/symbol-tree": {
+      "version": "3.2.4",
+      "resolved": "https://registry.npmjs.org/symbol-tree/-/symbol-tree-3.2.4.tgz",
+      "integrity": "sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/test-exclude": {
+      "version": "7.0.1",
+      "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-7.0.1.tgz",
+      "integrity": "sha512-pFYqmTw68LXVjeWJMST4+borgQP2AyMNbg1BpZh9LbyhUeNkeaPF9gzfPGUAnSMV3qPYdWUwDIjjCLiSDOl7vg==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "@istanbuljs/schema": "^0.1.2",
+        "glob": "^10.4.1",
+        "minimatch": "^9.0.4"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/tinybench": {
       "version": "2.9.0",
       "dev": true,
@@ -1255,6 +2584,52 @@
         "node": ">=14.0.0"
       }
     },
+    "node_modules/tldts": {
+      "version": "6.1.86",
+      "resolved": "https://registry.npmjs.org/tldts/-/tldts-6.1.86.tgz",
+      "integrity": "sha512-WMi/OQ2axVTf/ykqCQgXiIct+mSQDFdH2fkwhPwgEwvJ1kSzZRiinb0zF2Xb8u4+OqPChmyI6MEu4EezNJz+FQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "tldts-core": "^6.1.86"
+      },
+      "bin": {
+        "tldts": "bin/cli.js"
+      }
+    },
+    "node_modules/tldts-core": {
+      "version": "6.1.86",
+      "resolved": "https://registry.npmjs.org/tldts-core/-/tldts-core-6.1.86.tgz",
+      "integrity": "sha512-Je6p7pkk+KMzMv2XXKmAE3McmolOQFdxkKw0R8EYNr7sELW46JqnNeTX8ybPiQgvg1ymCoF8LXs5fzFaZvJPTA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/tough-cookie": {
+      "version": "5.1.2",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-5.1.2.tgz",
+      "integrity": "sha512-FVDYdxtnj0G6Qm/DhNPSb8Ju59ULcup3tuJxkFb5K8Bv2pUXILbf0xZWU8PX8Ov19OXljbUyveOFwRMwkXzO+A==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "tldts": "^6.1.32"
+      },
+      "engines": {
+        "node": ">=16"
+      }
+    },
+    "node_modules/tr46": {
+      "version": "5.1.1",
+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-5.1.1.tgz",
+      "integrity": "sha512-hdF5ZgjTqgAntKkklYw0R03MG2x/bSzTtkxmIRw/sTNV8YXsCJ1tfLAX23lhxhHJlEf3CRCOCGGWw3vI3GaSPw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "punycode": "^2.3.1"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/undici-types": {
       "version": "6.21.0",
       "dev": true,
@@ -1431,6 +2806,88 @@
         }
       }
     },
+    "node_modules/w3c-xmlserializer": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-5.0.0.tgz",
+      "integrity": "sha512-o8qghlI8NZHU1lLPrpi2+Uq7abh4GGPpYANlalzWxyWteJOCsr/P+oPBA49TOLu5FTZO4d3F9MnWJfiMo4BkmA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "xml-name-validator": "^5.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/webidl-conversions": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-7.0.0.tgz",
+      "integrity": "sha512-VwddBukDzu71offAQR975unBIGqfKZpM+8ZX6ySk8nYhVoo5CYaZyzt3YBvYtRtO+aoGlqxPg/B87NGVZ/fu6g==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/whatwg-encoding": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-3.1.1.tgz",
+      "integrity": "sha512-6qN4hJdMwfYBtE3YBTTHhoeuUrDBPZmbQaxWAqSALV/MeEnR5z1xd8UKud2RAkFoPkmB+hli1TZSnyi84xz1vQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "iconv-lite": "0.6.3"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/whatwg-fetch": {
+      "version": "3.6.20",
+      "resolved": "https://registry.npmjs.org/whatwg-fetch/-/whatwg-fetch-3.6.20.tgz",
+      "integrity": "sha512-EqhiFU6daOA8kpjOWTL0olhVOF3i7OrFzSYiGsEMB8GcXS+RrzauAERX65xMeNWVqxA6HXH2m69Z9LaKKdisfg==",
+      "license": "MIT"
+    },
+    "node_modules/whatwg-mimetype": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-4.0.0.tgz",
+      "integrity": "sha512-QaKxh0eNIi2mE9p2vEdzfagOKHCcj1pJ56EEHGQOVxp8r9/iszLUUV7v89x9O1p/T+NlTM5W7jW6+cz4Fq1YVg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/whatwg-url": {
+      "version": "14.2.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-14.2.0.tgz",
+      "integrity": "sha512-De72GdQZzNTUBBChsXueQUnPKDkg/5A5zp7pFDuQAj5UFoENpiACU0wlCvzpAGnTkj++ihpKwKyYewn/XNUbKw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "tr46": "^5.1.0",
+        "webidl-conversions": "^7.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/which": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
+      "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "isexe": "^2.0.0"
+      },
+      "bin": {
+        "node-which": "bin/node-which"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
     "node_modules/why-is-node-running": {
       "version": "2.3.0",
       "dev": true,
@@ -1445,6 +2902,130 @@
       "engines": {
         "node": ">=8"
       }
+    },
+    "node_modules/wrap-ansi": {
+      "version": "8.1.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-8.1.0.tgz",
+      "integrity": "sha512-si7QWI6zUMq56bESFvagtmzMdGOtoxfR+Sez11Mobfc7tm+VkUckk9bW2UeffTGVUbOksxmSw0AA2gs8g71NCQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^6.1.0",
+        "string-width": "^5.0.1",
+        "strip-ansi": "^7.0.1"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
+      }
+    },
+    "node_modules/wrap-ansi-cjs": {
+      "name": "wrap-ansi",
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
+      "integrity": "sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^4.0.0",
+        "string-width": "^4.1.0",
+        "strip-ansi": "^6.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
+      }
+    },
+    "node_modules/wrap-ansi-cjs/node_modules/emoji-regex": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+      "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/wrap-ansi-cjs/node_modules/string-width": {
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+      "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "emoji-regex": "^8.0.0",
+        "is-fullwidth-code-point": "^3.0.0",
+        "strip-ansi": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/wrap-ansi-cjs/node_modules/strip-ansi": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/wrap-ansi/node_modules/ansi-styles": {
+      "version": "6.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-6.2.1.tgz",
+      "integrity": "sha512-bN798gFfQX+viw3R7yrGWRqnrN2oRkEkUjjl4JNn4E8GxxbjtG3FbrEIIY3l8/hrwUwIeCZvi4QuOTP4MErVug==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/ws": {
+      "version": "8.18.2",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.18.2.tgz",
+      "integrity": "sha512-DMricUmwGZUVr++AEAe2uiVM7UoO9MAVZMDu05UQOaUII0lp+zOzLLU4Xqh/JvTqklB1T4uELaaPBKyjE1r4fQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/xml-name-validator": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-5.0.0.tgz",
+      "integrity": "sha512-EvGK8EJ3DhaHfbRlETOWAS5pO9MZITeauHKJyb8wyajUfQUenkIg2MvLDTZ4T/TgIcm3HU0TFBgWWboAZ30UHg==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/xmlchars": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==",
+      "dev": true,
+      "license": "MIT"
     }
   }
 }
diff --git a/package.json b/package.json
index 73736d2..96aebb7 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,11 @@
     "dev": "vite",
     "build": "vite build",
     "preview": "vite preview",
-    "test": "vitest"
+    "test": "vitest run",
+    "test.watch": "vitest watch",
+    "test.coverage": "vitest run --coverage",
+    "format": "prettier --write src/ tests/ package.json vite.config.js vitest.config.js",
+    "format.lessons": "prettier --write lessons/*.json"
   },
   "keywords": [
     "css",
@@ -20,7 +24,15 @@
   "author": "Michael Czechowski <mail@dailysh.it>",
   "license": "Copyright Michael Czechowski 2025",
   "devDependencies": {
+    "@testing-library/dom": "^10.4.0",
+    "@testing-library/jest-dom": "^6.6.3",
+    "@vitest/coverage-v8": "^3.1.3",
+    "jsdom": "^26.1.0",
+    "prettier": "^3.5.3",
     "vite": "^6.3.5",
     "vitest": "^3.1.3"
+  },
+  "dependencies": {
+    "whatwg-fetch": "^3.6.20"
   }
 }
diff --git a/scaffold.sh b/scaffold.sh
deleted file mode 100755
index 66637b9..0000000
--- a/scaffold.sh
+++ /dev/null
@@ -1,49 +0,0 @@
-#!/bin/bash
-
-# Define base directory
-BASE_DIR="."
-
-# Create directories
-mkdir -p "$BASE_DIR/src/styles"
-mkdir -p "$BASE_DIR/src/js"
-mkdir -p "$BASE_DIR/src/lessons/configs"
-
-# Create files with comments
-touch "$BASE_DIR/src/index.html"
-echo "<!-- Main entry HTML file -->" > "$BASE_DIR/src/index.html"
-
-touch "$BASE_DIR/src/styles/main.css"
-echo "/* Global styles */" > "$BASE_DIR/src/styles/main.css"
-
-touch "$BASE_DIR/src/js/app.js"
-echo "// Main application logic" > "$BASE_DIR/src/js/app.js"
-
-touch "$BASE_DIR/src/js/LessonEngine.js"
-echo "// Core lesson processing engine" > "$BASE_DIR/src/js/LessonEngine.js"
-
-touch "$BASE_DIR/src/js/renderer.js"
-echo "// Handles UI rendering" > "$BASE_DIR/src/js/renderer.js"
-
-touch "$BASE_DIR/src/js/validator.js"
-echo "// Validates user code submissions" > "$BASE_DIR/src/js/validator.js"
-
-touch "$BASE_DIR/src/lessons/lesson-config.js"
-echo "// Loads and parses lesson configs" > "$BASE_DIR/src/lessons/lesson-config.js"
-
-touch "$BASE_DIR/src/lessons/configs/flexbox.json"
-echo "{ /* Flexbox lesson config */ }" > "$BASE_DIR/src/lessons/configs/flexbox.json"
-
-touch "$BASE_DIR/src/lessons/configs/grid.json"
-echo "{ /* Grid lesson config */ }" > "$BASE_DIR/src/lessons/configs/grid.json"
-
-touch "$BASE_DIR/src/lessons/configs/basics.json"
-echo "{ /* Basics lesson config */ }" > "$BASE_DIR/src/lessons/configs/basics.json"
-
-touch "$BASE_DIR/package.json"
-echo "{\n  \"name\": \"css-learning-platform\",\n  \"version\": \"1.0.0\"\n}" > "$BASE_DIR/package.json"
-
-touch "$BASE_DIR/vite.config.js"
-echo "// Vite config file" > "$BASE_DIR/vite.config.js"
-
-echo "Project scaffolded at: $BASE_DIR"
-
diff --git a/tests/setup.js b/tests/setup.js
new file mode 100644
index 0000000..043b6c9
--- /dev/null
+++ b/tests/setup.js
@@ -0,0 +1,100 @@
+import { afterEach } from 'vitest';
+import '@testing-library/jest-dom/vitest';
+// import 'whatwg-fetch';
+
+// Setup mock for localStorage
+const localStorageMock = (() => {
+    let store = {};
+    return {
+        getItem(key) {
+            return store[key] || null;
+        },
+        setItem(key, value) {
+            store[key] = String(value);
+        },
+        removeItem(key) {
+            delete store[key];
+        },
+        clear() {
+            store = {};
+        },
+        length: 0,
+        key() { return null; }
+    };
+})();
+
+// Mock the DOM environment
+global.document.body.innerHTML = `
+<div class="app-container">
+  <aside class="sidebar">
+    <div class="module-list"></div>
+  </aside>
+  <main class="content">
+    <div class="lesson-container">
+      <h2 id="lesson-title"></h2>
+      <div id="lesson-description"></div>
+      <div class="task-container">
+        <h3>Your Task</h3>
+        <div id="task-instruction"></div>
+      </div>
+      <div class="preview-container">
+        <h3>Preview</h3>
+        <div id="preview-area"></div>
+      </div>
+      <div class="editor-container">
+        <h3>CSS Editor</h3>
+        <div class="editor-content">
+          <div id="editor-prefix"></div>
+          <textarea id="code-input"></textarea>
+          <div id="editor-suffix"></div>
+        </div>
+        <div class="editor-controls">
+          <button id="reset-btn">Reset</button>
+          <button id="run-btn">Run</button>
+        </div>
+      </div>
+      <div class="navigation">
+        <button id="prev-btn">Previous</button>
+        <span id="level-indicator"></span>
+        <button id="next-btn">Next</button>
+      </div>
+    </div>
+  </main>
+  <div id="modal-container" class="hidden">
+    <div class="modal">
+      <div class="modal-header">
+        <h2 id="modal-title"></h2>
+        <button id="modal-close">&times;</button>
+      </div>
+      <div id="modal-content"></div>
+    </div>
+  </div>
+  <button id="module-selector-btn">Progress</button>
+  <button id="help-btn">Help</button>
+</div>
+`;
+
+// Setup browser mocks
+global.localStorage = localStorageMock;
+window.localStorage = localStorageMock;
+
+// For iframe support in jsdom
+if (!window.document.createRange) {
+    window.document.createRange = () => ({
+        setStart: () => {},
+        setEnd: () => {},
+        commonAncestorContainer: {
+            nodeName: 'BODY',
+            ownerDocument: document,
+        },
+    });
+}
+
+// Add fetch mock
+global.fetch = vi.fn();
+
+// Clean up after each test
+afterEach(() => {
+    localStorage.clear();
+    fetch.mockReset();
+});
\ No newline at end of file
diff --git a/tests/unit/lessons.test.js b/tests/unit/lessons.test.js
new file mode 100644
index 0000000..e5c0ff0
--- /dev/null
+++ b/tests/unit/lessons.test.js
@@ -0,0 +1,184 @@
+import { describe, test, expect, vi, beforeEach } from 'vitest';
+import { loadModules, getModuleById, loadModuleFromUrl, addCustomModule } from '../../src/config/lessons.js';
+
+// Mock the module store for testing
+vi.mock('../../lessons/flexbox.json', () => ({ default: { id: 'flexbox', title: 'Flexbox', lessons: [] }}));
+vi.mock('../../lessons/grid.json', () => ({ default: { id: 'grid', title: 'CSS Grid', lessons: [] }}));
+vi.mock('../../lessons/basics.json', () => ({ default: { id: 'basics', title: 'CSS Basics', lessons: [] }}));
+vi.mock('../../lessons/tailwindcss.json', () => ({ default: { id: 'tailwind', title: 'Tailwind CSS', lessons: [] }}));
+
+describe('Lessons Config Module', () => {
+    describe('loadModules', () => {
+        test('should return an array of modules', async () => {
+            const modules = await loadModules();
+
+            expect(Array.isArray(modules)).toBe(true);
+            expect(modules.length).toBe(4);
+
+            // Check if modules have the right structure
+            const moduleIds = modules.map(m => m.id);
+            expect(moduleIds).toContain('basics');
+            expect(moduleIds).toContain('flexbox');
+            expect(moduleIds).toContain('grid');
+            expect(moduleIds).toContain('tailwind');
+        });
+    });
+
+    describe('getModuleById', () => {
+        test('should return a module by ID', async () => {
+            // Load modules first to populate the module store
+            await loadModules();
+
+            const flexboxModule = getModuleById('flexbox');
+            expect(flexboxModule).not.toBeNull();
+            expect(flexboxModule.id).toBe('flexbox');
+            expect(flexboxModule.title).toBe('Flexbox');
+        });
+
+        test('should return null for non-existent module ID', async () => {
+            // Load modules first
+            await loadModules();
+
+            const nonExistentModule = getModuleById('non-existent');
+            expect(nonExistentModule).toBeNull();
+        });
+    });
+
+    describe('loadModuleFromUrl', () => {
+        beforeEach(() => {
+            // Reset fetch mock
+            fetch.mockReset();
+        });
+
+        test('should load a module from a URL', async () => {
+            const mockModule = {
+                id: 'remote-module',
+                title: 'Remote Module',
+                lessons: [
+                    { title: 'Lesson 1', previewHTML: '<div>Preview</div>' }
+                ]
+            };
+
+            // Mock the fetch response
+            fetch.mockResolvedValueOnce({
+                ok: true,
+                json: async () => mockModule
+            });
+
+            const result = await loadModuleFromUrl('https://example.com/module.json');
+
+            expect(fetch).toHaveBeenCalledWith('https://example.com/module.json');
+            expect(result).toEqual(mockModule);
+        });
+
+        test('should throw an error for failed fetch', async () => {
+            fetch.mockResolvedValueOnce({
+                ok: false,
+                status: 404,
+                statusText: 'Not Found'
+            });
+
+            await expect(loadModuleFromUrl('https://example.com/not-found.json'))
+                .rejects
+                .toThrow('Failed to load module: 404 Not Found');
+        });
+
+        test('should validate module structure', async () => {
+            // Missing required fields
+            const invalidModule = {
+                // Missing id
+                title: 'Invalid Module'
+                // Missing lessons array
+            };
+
+            fetch.mockResolvedValueOnce({
+                ok: true,
+                json: async () => invalidModule
+            });
+
+            await expect(loadModuleFromUrl('https://example.com/invalid.json'))
+                .rejects
+                .toThrow('Module config missing "id"');
+
+            // Invalid lessons structure
+            const moduleWithInvalidLessons = {
+                id: 'invalid-lessons',
+                title: 'Invalid Lessons',
+                lessons: [
+                    { /* Missing title */ previewHTML: '<div>Preview</div>' }
+                ]
+            };
+
+            fetch.mockResolvedValueOnce({
+                ok: true,
+                json: async () => moduleWithInvalidLessons
+            });
+
+            await expect(loadModuleFromUrl('https://example.com/invalid-lessons.json'))
+                .rejects
+                .toThrow('Lesson 0 missing "title"');
+        });
+    });
+
+    describe('addCustomModule', () => {
+        test('should add a new module to the store', async () => {
+            // Load modules first to get current count
+            const initialModules = await loadModules();
+            const initialCount = initialModules.length;
+
+            const customModule = {
+                id: 'custom-module',
+                title: 'Custom Module',
+                lessons: [
+                    { title: 'Custom Lesson', previewHTML: '<div>Preview</div>' }
+                ]
+            };
+
+            const result = addCustomModule(customModule);
+            expect(result).toBe(true);
+
+            // Check if module was added
+            const updatedModules = await loadModules();
+            expect(updatedModules.length).toBe(initialCount + 1);
+
+            const addedModule = getModuleById('custom-module');
+            expect(addedModule).not.toBeNull();
+            expect(addedModule.title).toBe('Custom Module');
+        });
+
+        test('should replace existing module with same ID', async () => {
+            // Add a module first
+            const customModule = {
+                id: 'replace-test',
+                title: 'Original Module',
+                lessons: [{ title: 'Original Lesson', previewHTML: '<div>Preview</div>' }]
+            };
+
+            addCustomModule(customModule);
+
+            // Now replace it
+            const replacementModule = {
+                id: 'replace-test',
+                title: 'Replacement Module',
+                lessons: [{ title: 'New Lesson', previewHTML: '<div>New Preview</div>' }]
+            };
+
+            const result = addCustomModule(replacementModule);
+            expect(result).toBe(true);
+
+            // Check if module was replaced
+            const updatedModule = getModuleById('replace-test');
+            expect(updatedModule.title).toBe('Replacement Module');
+        });
+
+        test('should validate module before adding', () => {
+            const invalidModule = {
+                // Missing required fields
+                title: 'Invalid Module'
+            };
+
+            const result = addCustomModule(invalidModule);
+            expect(result).toBe(false);
+        });
+    });
+});
\ No newline at end of file
diff --git a/tests/unit/renderer.test.js b/tests/unit/renderer.test.js
new file mode 100644
index 0000000..dd7c826
--- /dev/null
+++ b/tests/unit/renderer.test.js
@@ -0,0 +1,178 @@
+import { describe, test, expect, vi, beforeEach } from 'vitest';
+import { renderModuleList, renderLesson, renderLevelIndicator, showFeedback, clearFeedback } from '../../src/helpers/renderer.js';
+
+describe('Renderer Module', () => {
+    beforeEach(() => {
+        // Reset the DOM between tests
+        document.body.innerHTML = `
+      <div id="module-list"></div>
+      <h2 id="title"></h2>
+      <div id="description"></div>
+      <div id="task"></div>
+      <div id="preview"></div>
+      <div id="prefix"></div>
+      <textarea id="input"></textarea>
+      <div id="suffix"></div>
+      <div id="level-indicator"></div>
+      <div id="code-editor"></div>
+    `;
+    });
+
+    describe('renderModuleList', () => {
+        test('should render a list of modules', () => {
+            const container = document.getElementById('module-list');
+            const modules = [
+                { id: 'mod1', title: 'Module 1' },
+                { id: 'mod2', title: 'Module 2' }
+            ];
+            const onSelectModule = vi.fn();
+
+            renderModuleList(container, modules, onSelectModule);
+
+            // Check if heading is created
+            expect(container.innerHTML).toContain('<h3>Modules</h3>');
+
+            // Check if module items are created
+            const moduleItems = container.querySelectorAll('.module-list-item');
+            expect(moduleItems.length).toBe(2);
+            expect(moduleItems[0].textContent).toBe('Module 1');
+            expect(moduleItems[1].textContent).toBe('Module 2');
+
+            // Test click event
+            moduleItems[0].click();
+            expect(onSelectModule).toHaveBeenCalledWith('mod1');
+        });
+
+        test('should handle empty module list', () => {
+            const container = document.getElementById('module-list');
+            renderModuleList(container, [], vi.fn());
+
+            expect(container.innerHTML).toContain('<h3>Modules</h3>');
+            expect(container.querySelectorAll('.module-list-item').length).toBe(0);
+        });
+    });
+
+    describe('renderLesson', () => {
+        test('should render lesson content correctly', () => {
+            const titleEl = document.getElementById('title');
+            const descriptionEl = document.getElementById('description');
+            const taskEl = document.getElementById('task');
+            const previewEl = document.getElementById('preview');
+            const prefixEl = document.getElementById('prefix');
+            const inputEl = document.getElementById('input');
+            const suffixEl = document.getElementById('suffix');
+
+            const lesson = {
+                title: 'Test Lesson',
+                description: '<p>Description text</p>',
+                task: '<p>Task instructions</p>',
+                codePrefix: 'body {',
+                initialCode: '  color: red;',
+                codeSuffix: '}'
+            };
+
+            renderLesson(
+                titleEl,
+                descriptionEl,
+                taskEl,
+                previewEl,
+                prefixEl,
+                inputEl,
+                suffixEl,
+                lesson
+            );
+
+            expect(titleEl.textContent).toBe('Test Lesson');
+            expect(descriptionEl.innerHTML).toBe('<p>Description text</p>');
+            expect(taskEl.innerHTML).toBe('<p>Task instructions</p>');
+            expect(prefixEl.textContent).toBe('body {');
+            expect(inputEl.value).toBe('  color: red;');
+            expect(suffixEl.textContent).toBe('}');
+        });
+
+        test('should handle missing lesson data with defaults', () => {
+            const titleEl = document.getElementById('title');
+            const descriptionEl = document.getElementById('description');
+            const taskEl = document.getElementById('task');
+            const prefixEl = document.getElementById('prefix');
+            const inputEl = document.getElementById('input');
+            const suffixEl = document.getElementById('suffix');
+
+            // Empty lesson object
+            const lesson = {};
+
+            renderLesson(
+                titleEl,
+                descriptionEl,
+                taskEl,
+                document.getElementById('preview'),
+                prefixEl,
+                inputEl,
+                suffixEl,
+                lesson
+            );
+
+            expect(titleEl.textContent).toBe('Untitled Lesson');
+            expect(descriptionEl.innerHTML).toBe('');
+            expect(taskEl.innerHTML).toBe('');
+            expect(prefixEl.textContent).toBe('');
+            expect(inputEl.value).toBe('');
+            expect(suffixEl.textContent).toBe('');
+        });
+    });
+
+    describe('renderLevelIndicator', () => {
+        test('should update level indicator text', () => {
+            const element = document.getElementById('level-indicator');
+
+            renderLevelIndicator(element, 3, 10);
+            expect(element.textContent).toBe('Lesson 3 of 10');
+
+            renderLevelIndicator(element, 1, 5);
+            expect(element.textContent).toBe('Lesson 1 of 5');
+        });
+    });
+
+    describe.skip('showFeedback and clearFeedback', () => {
+        test('should create success feedback element', () => {
+            const editor = document.getElementById('code-editor');
+            showFeedback(true, 'Great job!');
+
+            const feedback = document.querySelector('.feedback-success');
+            expect(feedback).not.toBeNull();
+            expect(feedback.textContent).toBe('Great job!');
+
+            // Test auto clearing with setTimeout
+            vi.useFakeTimers();
+            showFeedback(true, 'Auto clear test');
+            vi.advanceTimersByTime(5001);
+            expect(document.querySelector('.feedback-success')).toBeNull();
+            vi.useRealTimers();
+        });
+
+        test('should create error feedback element', () => {
+            showFeedback(false, 'Try again');
+
+            const feedback = document.querySelector('.feedback-error');
+            expect(feedback).not.toBeNull();
+            expect(feedback.textContent).toBe('Try again');
+
+            // Error feedback should not auto-clear
+            vi.useFakeTimers();
+            vi.advanceTimersByTime(5001);
+            expect(document.querySelector('.feedback-error')).not.toBeNull();
+            vi.useRealTimers();
+        });
+
+        test('should clear existing feedback', () => {
+            showFeedback(false, 'Error message');
+            expect(document.querySelector('.feedback-error')).not.toBeNull();
+
+            clearFeedback();
+            expect(document.querySelector('.feedback-error')).toBeNull();
+
+            // Should work when called multiple times
+            clearFeedback();
+        });
+    });
+});
\ No newline at end of file
diff --git a/tests/unit/validator.test.js b/tests/unit/validator.test.js
new file mode 100644
index 0000000..faa93a7
--- /dev/null
+++ b/tests/unit/validator.test.js
@@ -0,0 +1,239 @@
+import { describe, it, expect, vi } from 'vitest';
+import { validateUserCode } from '../../src/helpers/validator.js';
+
+describe('CSS Validator', () => {
+    // Mock document functions since we're not in a browser
+    document.createElement = vi.fn().mockImplementation(() => {
+        return {
+            textContent: '',
+            parentNode: { removeChild: vi.fn() }
+        };
+    });
+
+    // document.head = {
+    //     appendChild: vi.fn(),
+    //     removeChild: vi.fn()
+    // };
+
+    describe('validateUserCode', () => {
+        it('should pass when no validations are specified', () => {
+            const userCode = 'div { color: red; }';
+            const lesson = { title: 'Test Lesson' };
+
+            const result = validateUserCode(userCode, lesson);
+
+            expect(result.isValid).toBe(true);
+            expect(result.message).toContain('No validations specified');
+        });
+
+        it('should pass with empty validations array', () => {
+            const userCode = 'div { color: red; }';
+            const lesson = {
+                title: 'Test Lesson',
+                validations: []
+            };
+
+            const result = validateUserCode(userCode, lesson);
+
+            expect(result.isValid).toBe(true);
+            expect(result.message).toBe('Your code looks good!');
+        });
+
+        it('should validate "contains" rule correctly', () => {
+            const userCode = 'div { color: red; }';
+            const lesson = {
+                validations: [
+                    { type: 'contains', value: 'color: red', message: 'Should use red color' }
+                ]
+            };
+
+            const result = validateUserCode(userCode, lesson);
+            expect(result.isValid).toBe(true);
+
+            const failLesson = {
+                validations: [
+                    { type: 'contains', value: 'color: blue', message: 'Should use blue color' }
+                ]
+            };
+
+            const failResult = validateUserCode(userCode, failLesson);
+            expect(failResult.isValid).toBe(false);
+            expect(failResult.message).toBe('Should use blue color');
+        });
+
+        it('should validate "not_contains" rule correctly', () => {
+            const userCode = 'div { color: red; }';
+            const lesson = {
+                validations: [
+                    { type: 'not_contains', value: 'color: blue', message: 'Should not use blue color' }
+                ]
+            };
+
+            const result = validateUserCode(userCode, lesson);
+            expect(result.isValid).toBe(true);
+
+            const failLesson = {
+                validations: [
+                    { type: 'not_contains', value: 'color: red', message: 'Should not use red color' }
+                ]
+            };
+
+            const failResult = validateUserCode(userCode, failLesson);
+            expect(failResult.isValid).toBe(false);
+            expect(failResult.message).toBe('Should not use red color');
+        });
+
+        it('should validate "regex" rule correctly', () => {
+            const userCode = 'div { color: #ff0000; }';
+            const lesson = {
+                validations: [
+                    { type: 'regex', value: '#[a-f0-9]{6}', message: 'Should use hex color' }
+                ]
+            };
+
+            const result = validateUserCode(userCode, lesson);
+            expect(result.isValid).toBe(true);
+
+            const failLesson = {
+                validations: [
+                    { type: 'regex', value: 'rgb\\(\\d+,\\s*\\d+,\\s*\\d+\\)', message: 'Should use RGB color' }
+                ]
+            };
+
+            const failResult = validateUserCode(userCode, failLesson);
+            expect(failResult.isValid).toBe(false);
+            expect(failResult.message).toBe('Should use RGB color');
+        });
+
+        it('should validate "property_value" rule correctly', () => {
+            const userCode = 'div { display: flex; }';
+            const lesson = {
+                validations: [
+                    {
+                        type: 'property_value',
+                        value: { property: 'display', expected: 'flex' },
+                        message: 'Should use display: flex'
+                    }
+                ]
+            };
+
+            const result = validateUserCode(userCode, lesson);
+            expect(result.isValid).toBe(true);
+
+            const failLesson = {
+                validations: [
+                    {
+                        type: 'property_value',
+                        value: { property: 'display', expected: 'grid' },
+                        message: 'Should use display: grid'
+                    }
+                ]
+            };
+
+            const failResult = validateUserCode(userCode, failLesson);
+            expect(failResult.isValid).toBe(false);
+            expect(failResult.message).toBe('Should use display: grid');
+        });
+
+        it('should handle complex validation chains', () => {
+            const userCode = 'div { display: flex; color: red; }';
+            const lesson = {
+                validations: [
+                    { type: 'contains', value: 'display: flex' },
+                    { type: 'contains', value: 'color: red' },
+                    { type: 'not_contains', value: 'float:' }
+                ]
+            };
+
+            const result = validateUserCode(userCode, lesson);
+            expect(result.isValid).toBe(true);
+
+            // First failing validation should cause early return
+            const failLesson = {
+                validations: [
+                    { type: 'contains', value: 'display: flex' },
+                    { type: 'contains', value: 'border: 1px solid black', message: 'Missing border' },
+                    { type: 'not_contains', value: 'color: green' }
+                ]
+            };
+
+            const failResult = validateUserCode(userCode, failLesson);
+            expect(failResult.isValid).toBe(false);
+            expect(failResult.message).toBe('Missing border');
+        });
+
+        it('should validate "custom" rule correctly', () => {
+            const userCode = 'div { margin: 10px; }';
+            const customValidator = (code) => {
+                return {
+                    isValid: code.includes('margin'),
+                    message: 'Should include margin property'
+                };
+            };
+
+            const lesson = {
+                validations: [
+                    {
+                        type: 'custom',
+                        validator: customValidator
+                    }
+                ]
+            };
+
+            const result = validateUserCode(userCode, lesson);
+            expect(result.isValid).toBe(true);
+
+            const failValidator = (code) => {
+                return {
+                    isValid: code.includes('padding'),
+                    message: 'Should include padding property'
+                };
+            };
+
+            const failLesson = {
+                validations: [
+                    {
+                        type: 'custom',
+                        validator: failValidator,
+                        message: 'Custom validation failed'
+                    }
+                ]
+            };
+
+            const failResult = validateUserCode(userCode, failLesson);
+            expect(failResult.isValid).toBe(false);
+            expect(failResult.message).toBe('Should include padding property');
+        });
+
+        it('should handle options in validations', () => {
+            // Case insensitive test
+            const userCode = 'div { COLOR: Red; }';
+            const lesson = {
+                validations: [
+                    {
+                        type: 'contains',
+                        value: 'color: red',
+                        options: { caseSensitive: false }
+                    }
+                ]
+            };
+
+            const result = validateUserCode(userCode, lesson);
+            expect(result.isValid).toBe(true);
+
+            // With exact match required
+            const exactLesson = {
+                validations: [
+                    {
+                        type: 'property_value',
+                        value: { property: 'color', expected: 'red' },
+                        options: { exact: true }
+                    }
+                ]
+            };
+
+            const failExactResult = validateUserCode('div { color: RED; }', exactLesson);
+            expect(failExactResult.isValid).toBe(false);
+        });
+    });
+});
\ No newline at end of file
diff --git a/vitest.config.js b/vitest.config.js
new file mode 100644
index 0000000..93402b0
--- /dev/null
+++ b/vitest.config.js
@@ -0,0 +1,20 @@
+// vitest.config.js
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+    test: {
+        globals: true,
+        environment: 'jsdom',
+        setupFiles: ['./tests/setup.js'],
+        include: ['tests/**/*.{test,spec}.js'],
+        coverage: {
+            reporter: ['text', 'json', 'html'],
+            exclude: ['node_modules/', 'tests/setup.js']
+        },
+        server: {
+            deps: {
+                inline: true
+            }
+        }
+    }
+});
\ No newline at end of file