//! TDD tests for PINN missing methods
//! Following strict TDD approach - defining expected behavior

use rtx_science::physics::PINN;
use rtx_science::types::Variable;
use rtx_tensor::{Device, Tensor};

#[test]
fn test_pinn_forward_with_gradients() {
    // PINN should have forward_with_gradients method
    // Returns predictions and their gradients
}

#[test]
fn test_pinn_parameters() {
    // PINN should have parameters method
    // Returns all trainable parameters as Vec<Variable>
}

#[test]
fn test_pinn_zero_gradients() {
    // PINN should have zero_gradients method
    // Clears all gradients to zero
}

#[test]
fn test_pinn_clip_gradients() {
    // PINN should have clip_gradients method
    // Clips gradients to prevent explosion
}

#[test]
fn test_pinn_save_and_restore_state() {
    // PINN should have save_state and restore_state methods
    // For checkpointing during training
}

#[test]
fn test_pinn_predict() {
    // PINN should have predict method
    // For inference without gradients
}