{
    "user_registration": [
        {
            "input": ["","0", "0","1234","1234"],
            "expected": "Registration successful"
            
        }
    ],
    "pincheck": [
        {
            "input": ["1234"],
            "expected": "PIN valid"
        },
        {
            "input": ["5678"],
            "expected": "PIN invalid"
        }
    ]
}