refactor: move all tests out of src/ into tests/, remove unnecessary tests

tests/animated.rs

@@ -0,0 +1,67 @@
+use glam::U16Vec2;
+use pacman::texture::animated::{AnimatedTexture, AnimatedTextureError};
+use pacman::texture::sprite::AtlasTile;
+use sdl2::pixels::Color;
+
+fn mock_atlas_tile(id: u32) -> AtlasTile {
+    AtlasTile {
+        pos: U16Vec2::new(0, 0),
+        size: U16Vec2::new(16, 16),
+        color: Some(Color::RGB(id as u8, 0, 0)),
+    }
+}
+
+#[test]
+fn test_new_animated_texture_zero_duration() {
+    let tiles = vec![mock_atlas_tile(1), mock_atlas_tile(2)];
+    let result = AnimatedTexture::new(tiles, 0.0);
+    assert!(result.is_err());
+    assert!(matches!(result.unwrap_err(), AnimatedTextureError::InvalidFrameDuration(0.0)));
+}
+
+#[test]
+fn test_new_animated_texture_negative_duration() {
+    let tiles = vec![mock_atlas_tile(1), mock_atlas_tile(2)];
+    let result = AnimatedTexture::new(tiles, -0.1);
+    assert!(result.is_err());
+    assert!(matches!(
+        result.unwrap_err(),
+        AnimatedTextureError::InvalidFrameDuration(-0.1)
+    ));
+}
+
+#[test]
+fn test_tick_multiple_frame_changes() {
+    let tiles = vec![mock_atlas_tile(1), mock_atlas_tile(2), mock_atlas_tile(3)];
+    let mut texture = AnimatedTexture::new(tiles, 0.1).unwrap();
+
+    // Tick with 2.5 frame durations
+    texture.tick(0.25);
+    assert_eq!(texture.current_frame(), 2);
+    assert!((texture.time_bank() - 0.05).abs() < 0.001);
+}
+
+#[test]
+fn test_tick_wrap_around() {
+    let tiles = vec![mock_atlas_tile(1), mock_atlas_tile(2)];
+    let mut texture = AnimatedTexture::new(tiles, 0.1).unwrap();
+
+    // Advance to last frame
+    texture.tick(0.1);
+    assert_eq!(texture.current_frame(), 1);
+
+    // Advance again to wrap around
+    texture.tick(0.1);
+    assert_eq!(texture.current_frame(), 0);
+}
+
+#[test]
+fn test_single_tile_animation() {
+    let tiles = vec![mock_atlas_tile(1)];
+    let mut texture = AnimatedTexture::new(tiles, 0.1).unwrap();
+
+    // Should stay on same frame
+    texture.tick(0.1);
+    assert_eq!(texture.current_frame(), 0);
+    assert_eq!(texture.current_tile().color.unwrap().r, 1);
+}