Fix IllegalArgumentException

✅ Solution

The "IllegalArgumentException" in Jest coverage often arises from incorrect or circular references within your code, especially in complex class structures or when using decorators. Review your code for circular dependencies, incorrect class inheritance, or improperly used decorators, and refactor to eliminate these problematic references to ensure Jest can correctly traverse and analyze your codebase. Specifically, pay close attention to how classes are imported and extended, and simplify circular dependency chains.