test(renderer): relocate frustum tests into src/tests

crates/renderer/src/frustum.rs

@@ -62,40 +62,5 @@ impl Frustum {
 }
 
 #[cfg(test)]
-mod tests {
+#[path = "tests/frustum.rs"]
-    use super::Frustum;
+mod tests;
-    use glam::Vec3;
-
-    /// Builds a frustum for a camera at the origin looking down the -Z axis, matching the engine's right-handed Vulkan-clip projection.
-    fn forward_facing_frustum() -> Frustum {
-        let proj = glam::camera::rh::proj::vulkan::perspective(60f32.to_radians(), 1.0, 0.1, 100.0);
-        let view = glam::camera::rh::view::look_at_mat4(Vec3::ZERO, Vec3::NEG_Z, Vec3::Y);
-        Frustum::from_view_proj(proj * view)
-    }
-
-    #[test]
-    fn box_in_front_is_visible() {
-        let frustum = forward_facing_frustum();
-        assert!(frustum.intersects_aabb(Vec3::new(-1.0, -1.0, -6.0), Vec3::new(1.0, 1.0, -4.0)));
-    }
-
-    #[test]
-    fn box_behind_camera_is_culled() {
-        // A box entirely behind the camera. This is the case that fails if the near plane is extracted with the OpenGL `r3 + r2` formula instead of `r2`.
-        let frustum = forward_facing_frustum();
-        assert!(!frustum.intersects_aabb(Vec3::new(-1.0, -1.0, 4.0), Vec3::new(1.0, 1.0, 6.0)));
-    }
-
-    #[test]
-    fn box_far_to_the_side_is_culled() {
-        // Well outside the horizontal field of view at an otherwise valid depth.
-        let frustum = forward_facing_frustum();
-        assert!(!frustum.intersects_aabb(Vec3::new(50.0, -1.0, -5.0), Vec3::new(52.0, 1.0, -4.0)));
-    }
-
-    #[test]
-    fn huge_box_straddling_origin_is_visible() {
-        let frustum = forward_facing_frustum();
-        assert!(frustum.intersects_aabb(Vec3::splat(-100.0), Vec3::splat(100.0)));
-    }
-}

crates/renderer/src/tests/frustum.rs

@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: AGPL-3.0-only
+
+//! Unit tests for view-frustum culling in [`crate::frustum`].
+
+use super::Frustum;
+use glam::Vec3;
+
+/// Builds a frustum for a camera at the origin looking down the -Z axis, matching the engine's right-handed Vulkan-clip projection.
+fn forward_facing_frustum() -> Frustum {
+    let proj = glam::camera::rh::proj::vulkan::perspective(60f32.to_radians(), 1.0, 0.1, 100.0);
+    let view = glam::camera::rh::view::look_at_mat4(Vec3::ZERO, Vec3::NEG_Z, Vec3::Y);
+    Frustum::from_view_proj(proj * view)
+}
+
+#[test]
+fn box_in_front_is_visible() {
+    let frustum = forward_facing_frustum();
+    assert!(frustum.intersects_aabb(Vec3::new(-1.0, -1.0, -6.0), Vec3::new(1.0, 1.0, -4.0)));
+}
+
+#[test]
+fn box_behind_camera_is_culled() {
+    // A box entirely behind the camera. This is the case that fails if the near plane is extracted with the OpenGL `r3 + r2` formula instead of `r2`.
+    let frustum = forward_facing_frustum();
+    assert!(!frustum.intersects_aabb(Vec3::new(-1.0, -1.0, 4.0), Vec3::new(1.0, 1.0, 6.0)));
+}
+
+#[test]
+fn box_far_to_the_side_is_culled() {
+    // Well outside the horizontal field of view at an otherwise valid depth.
+    let frustum = forward_facing_frustum();
+    assert!(!frustum.intersects_aabb(Vec3::new(50.0, -1.0, -5.0), Vec3::new(52.0, 1.0, -4.0)));
+}
+
+#[test]
+fn huge_box_straddling_origin_is_visible() {
+    let frustum = forward_facing_frustum();
+    assert!(frustum.intersects_aabb(Vec3::splat(-100.0), Vec3::splat(100.0)));
+}