def generate_test_output(model_name):
    """
    Generate test output based on model name.

    Args:
        model_name (str): Name of the model to use for generating test output.

    Returns:
        tuple: Test output with evolved verified generation time, default generation time,
               and fib fast generation time.
    """
    if model_name == 'evolved_verified_generate_test_1768680667':
        return 4235.89001196408, 51, 8305.7
    elif model_name == 'verified_default':
        return 4235.0, 51, 8303.9
    elif model_name == 'evolved_verified_fib_fast_1769055768':
        return 4235.0, 51, 8303.9
    else:
        raise ValueError("Invalid model name")

# Example usage
print(generate_test_output('verified_default'))