"""Tests for trajectory post-processing primitives."""
from __future__ import annotations

import numpy as np

from ai_mouse._postprocess import gaussian_smooth


def test_gaussian_smooth_preserves_endpoints() -> None:
    x = np.array([1.0, 5.0, 3.0, 8.0, 2.0, 6.0, 4.0])
    result = gaussian_smooth(x, sigma=1.0)
    assert result[0] == 1.0
    assert result[-1] == 4.0


def test_gaussian_smooth_short_input_unchanged() -> None:
    x = np.array([1.0, 2.0, 3.0])
    result = gaussian_smooth(x, sigma=1.0)
    assert np.array_equal(result, x)


def test_gaussian_smooth_constant_unchanged() -> None:
    x = np.full(20, 7.5)
    result = gaussian_smooth(x, sigma=1.0)
    assert np.allclose(result, x, atol=1e-6)