init v.1.0.0

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

crates/domain/tests/construction.rs

@@ -0,0 +1,37 @@
+mod common;
+
+use common::{LOGO, ROOMY, scene_in, size, sprite_count, try_scene};
+use domain::{Dimensions, Point2D, Vector2D};
+
+#[test]
+fn dimensions_reject_zero_extents() {
+    assert!(Dimensions::new(0, 10).is_none());
+    assert!(Dimensions::new(10, 0).is_none());
+    assert!(Dimensions::new(10, 10).is_some());
+}
+
+#[test]
+fn points_reject_non_finite_coordinates() {
+    assert!(Point2D::new(f32::NAN, 0.0).is_none());
+    assert!(Point2D::new(0.0, f32::INFINITY).is_none());
+    assert!(Point2D::new(-1.0, 1.0).is_some());
+}
+
+#[test]
+fn vectors_reject_non_finite_components() {
+    assert!(Vector2D::new(f32::NAN, 1.0).is_none());
+    assert!(Vector2D::new(1.0, f32::NEG_INFINITY).is_none());
+    assert!(Vector2D::new(0.0, 0.0).is_some());
+}
+
+#[test]
+fn the_logo_must_fit_inside_the_bounds() {
+    assert!(try_scene(LOGO, LOGO).is_ok());
+    assert!(try_scene(size(LOGO.width() + 1, LOGO.height()), LOGO).is_err());
+    assert!(try_scene(size(LOGO.width(), LOGO.height() + 1), LOGO).is_err());
+}
+
+#[test]
+fn a_new_scene_holds_only_the_logo() {
+    assert_eq!(sprite_count(&scene_in(ROOMY)), 1);
+}