removed old tests, created new ones and format

libs/core/cache/src/key-generator.ts

@@ -71,3 +71,13 @@ export class CacheKeyGenerator {
     return Math.abs(hash).toString(36);
   }
 }
+
+/**
+ * Simple key generator function
+ */
+export function generateKey(...parts: (string | number | boolean | undefined)[]): string {
+  return parts
+    .filter(part => part !== undefined)
+    .map(part => String(part))
+    .join(':');
+}