Replace Jest with Mocha+Chai+Sinon, fix tests (#98)

Author: simonespa

.gitignore

@@ -1,2 +1,4 @@
-dist
-node_modules
+/.nyc_output/
+/coverage/
+/dist/
+/node_modules/

package.json

@@ -4,15 +4,21 @@
   "description": "An open source collection and playground of algorithms, data structures and related documentation to brush up your knowledge of computer science fundamentals, or learn it from scratch.",
   "type": "module",
   "scripts": {
-    "clean": "rm -rf dist",
-    "build": "pnpm clean && tsc",
-    "watch": "pnpm clean && tsc --watch"
+    "clean": "rm -rf .nyc_output coverage dist",
+    "test": "nyc mocha 'src/**/*.test.ts' --require=tsx",
+    "coverage": "nyc report --reporter html && open coverage/index.html",
+    "coverage:check": "nyc check-coverage --lines 90 --branches 80 --statements 90"
   },
   "packageManager": "pnpm@10.12.1",
   "devDependencies": {
+    "@types/chai": "^5.2.2",
+    "@types/mocha": "^10.0.10",
+    "@types/sinon": "^17.0.4",
+    "chai": "^5.2.1",
     "mocha": "^11.7.1",
     "nyc": "^17.1.0",
     "sinon": "^21.0.0",
+    "tsx": "^4.20.3",
     "typescript": "^5.8.3"
   },
   "repository": {