init v.1.0.0

Co-authored-by: Copilot <copilot@github.com>

crates/domain/tests/common/mod.rs

@@ -0,0 +1,62 @@
+#![allow(dead_code)]
+
+use domain::{Color, Dimensions, DomainError, Point2D, ScreensaverScene, Sprite, Vector2D};
+
+pub const LOGO: Dimensions = size(200, 100);
+pub const ROOMY: Dimensions = size(800, 600);
+pub const TINY: Dimensions = size(50, 50);
+
+pub const SNUG: Dimensions = size(LOGO.width() + 2, LOGO.height() + 2);
+pub const EDGE_ONLY: Dimensions = size(LOGO.width() + 2, ROOMY.height());
+
+pub const SPEED: Vector2D = velocity(3.0, 2.0);
+pub const RED: Color = Color {
+    r: 255,
+    g: 0,
+    b: 0,
+    a: 255,
+};
+
+pub const fn size(width: u32, height: u32) -> Dimensions {
+    match Dimensions::new(width, height) {
+        Some(size) => size,
+        None => panic!("test dimensions must be non-zero"),
+    }
+}
+
+const fn velocity(dx: f32, dy: f32) -> Vector2D {
+    match Vector2D::new(dx, dy) {
+        Some(velocity) => velocity,
+        None => panic!("test velocity must be finite"),
+    }
+}
+
+pub fn point(x: f32, y: f32) -> Point2D {
+    Point2D::new(x, y).expect("test point must be finite")
+}
+
+pub fn try_scene(logo: Dimensions, bounds: Dimensions) -> Result<ScreensaverScene, DomainError> {
+    ScreensaverScene::new(logo, SPEED, RED, bounds)
+}
+
+pub fn scene_in(bounds: Dimensions) -> ScreensaverScene {
+    try_scene(LOGO, bounds).expect("LOGO must fit the test bounds")
+}
+
+pub fn advance(scene: &mut ScreensaverScene, bounds: Dimensions, frames: u32) {
+    for _ in 0..frames {
+        scene.tick(bounds);
+    }
+}
+
+pub fn sprite_count(scene: &ScreensaverScene) -> usize {
+    scene.sprites().count()
+}
+
+pub fn logo_sprite(scene: &ScreensaverScene) -> Sprite {
+    scene.sprites().next().expect("the logo is always present")
+}
+
+pub fn bottom_right(bounds: Dimensions) -> Point2D {
+    point(bounds.width() as f32, bounds.height() as f32)
+}