lights: moving another doctest to unit

rtchallenge/src/lights.rs

@@ -13,21 +13,6 @@ pub struct PointLight {
 impl PointLight {
     /// Creates a new `PositionLight` at the given `position` and with the given
     /// `intensity`.
-    ///
-    /// # Examples
-    /// ```
-    /// use rtchallenge::{
-    ///     lights::PointLight,
-    ///     tuples::{Color, Tuple},
-    ///     WHITE,
-    /// };
-    ///
-    /// let intensity = WHITE;
-    /// let position = Tuple::point(0., 0., 0.);
-    /// let light = PointLight::new(position, intensity);
-    /// assert_eq!(light.position, position);
-    /// assert_eq!(light.intensity, intensity);
-    /// ```
     pub fn new<C>(position: Tuple, intensity: C) -> PointLight
     where
         C: Into<Color>,
@@ -38,3 +23,17 @@ impl PointLight {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::{lights::PointLight, tuples::point, WHITE};
+
+    #[test]
+    fn new() {
+        let intensity = WHITE;
+        let position = point(0., 0., 0.);
+        let light = PointLight::new(position, intensity);
+        assert_eq!(light.position, position);
+        assert_eq!(light.intensity, intensity);
+    }
+}