Complete the test plan for the Python code shown in the code block below, which is designed to validate a target humidity percentage set-point for an automated greenhouse control system.

valid_humidity = False
while not valid_humidity:
    humidity = int(input("Enter target humidity [45 to 65]: "))
    if humidity >= 45 and humidity <= 65:
        valid_humidity = True
    else:
        print("Alert: Humidity out of range")
print("Target humidity updated successfully")