chore: introduces a prisma client fake for demo purposes (#708)

Signed-off-by: Anthony D. Mays <[email protected]>

Author: anthonydmays

lib/javascript/fullstack_demo/package-lock.json

@@ -8,7 +8,7 @@
     "start": "next start",
     "lint": "next lint",
     "fix": "prettier . --write",
-    "test": "vitest",
+    "test": "vitest run --coverage",
     "postinstall": "prisma generate"
   },
   "dependencies": {
@@ -28,6 +28,7 @@
     "@types/react": "^19",
     "@types/react-dom": "^19",
     "@vitejs/plugin-react": "^4.3.4",
+    "@vitest/coverage-istanbul": "^2.1.8",
     "eslint": "^9",
     "eslint-config-next": "15.1.0",
     "eslint-config-prettier": "^9.1.0",
@@ -41,4 +42,4 @@
     "vitest": "^2.1.8",
     "vitest-fetch-mock": "^0.4.3"
   }
-}
+}