//! TDD tests for Variable type methods
//! These tests define expected behavior for Variable operations

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

#[test]
fn test_variable_value_method() {
    // Variable should have a value() method to get the underlying tensor
    let device = Device::cpu();
    let tensor = Tensor::zeros(&[2, 3], &device).unwrap();
    let variable = Variable::from_tensor(tensor.clone());

    // Should be able to get the value
    let value = variable.value();
    assert_eq!(value.shape().dims(), &[2, 3]);
}

#[test]
fn test_variable_multiply_scalar() {
    // Variable should support scalar multiplication
    let device = Device::cpu();
    let tensor = Tensor::ones(&[2, 3], &device).unwrap();
    let variable = Variable::from_tensor(tensor);

    // Should be able to multiply by scalar
    let result = variable.multiply_scalar(2.0).unwrap();
    assert!(result.value().shape().dims() == &[2, 3]);
}

#[test]
fn test_variable_mean_square() {
    // Variable should have mean_square method for MSE loss
    let device = Device::cpu();
    let tensor = Tensor::ones(&[2, 3], &device).unwrap();
    let variable = Variable::from_tensor(tensor);

    // Should compute mean of squared values
    let mse = variable.mean_square().unwrap();
    assert!(true); // Placeholder check
}