test: geometry test for ellipse

packages/geometry/test/src/geometry_test.dart

@@ -33,6 +33,27 @@ void main() {
     });
   });
 
+  group('calculateEllipse', () {
+    test('returns by default 100 points as indicated by precision', () {
+      final points = calculateEllipse(
+        center: Vector2.zero(),
+        bigRadius: 100,
+        smallRadius: 50,
+      );
+      expect(points.length, 100);
+    });
+
+    test('returns as many points as indicated by precision', () {
+      final points = calculateEllipse(
+        center: Vector2.zero(),
+        bigRadius: 100,
+        smallRadius: 50,
+        precision: 50,
+      );
+      expect(points.length, 50);
+    });
+  });
+
   group('calculateBezierCurve', () {
     test('fails if step not in range', () {
       expect(