minor fix

Author: hexqnt

src/domain/point.rs

@@ -106,7 +106,15 @@ impl<const N: usize> TryFrom<[Point; N]> for Points {
     type Error = InputError;
 
     fn try_from(points: [Point; N]) -> Result<Self, Self::Error> {
-        Self::try_from(Vec::from(points))
+        if N < MIN_POINTS {
+            return Err(InputError::TooFewPoints {
+                len: N,
+                min_required: MIN_POINTS,
+            });
+        }
+        Ok(Self {
+            points: Arc::from(points),
+        })
     }
 }
 

src/domain/tests/basics.rs

@@ -43,6 +43,20 @@ fn points_require_at_least_two_values() {
     );
 }
 
+#[test]
+fn points_array_construction_rejects_short_arrays() {
+    let points = [Point::try_new(0.0, 0.0).unwrap()];
+    let error = Points::try_from(points).expect_err("must reject short arrays");
+
+    assert_eq!(
+        error,
+        InputError::TooFewPoints {
+            len: 1,
+            min_required: 2,
+        }
+    );
+}
+
 #[test]
 fn family_validation_checks_min_points_and_domain() {
     let points = Points::try_from([