# Stderr Warning Feature Test

This page tests the new collapsible stderr warning feature. Cells with stderr output should show a "⚠ Warnings" button that can be clicked to expand/collapse the warning messages.

## Test Case 1: Cell with stderr output (should show collapsible warnings)

    model = create_js_with_sep_model()
    n, w_vals, P, P_cumsum, β, c, α, γ = model
    v_u_init = jnp.zeros(n)
    v_e_init = jnp.zeros(n)
    v_u, v_e, w_bar_first = solve_model_first_pass(model, v_u_init, v_e_init)

    W1123 10:15:26.780179   23830 cuda_executor.cc:1802] GPU interconnect information not available: INTERNAL: NVML doesn't support extracting fabric info or NVLink is not used by the device.
    W1123 10:15:26.783637   23767 cuda_executor.cc:1802] GPU interconnect information not available: INTERNAL: NVML doesn't support extracting fabric info or NVLink is not used by the device.

## Test Case 2: Cell without stderr output (should display normally)

This cell has no stderr, so it should render normally without a warning button.

    print("Hello, World!")

    Hello, World!

## Test Case 3: Multiple stderr outputs in one cell

    run_complex_calculation()

    WARNING: Deprecated function call detected

    WARNING: Configuration file not found, using defaults

    Calculation completed successfully