Test "Kreisumfang" and method kreisUmfang from private to public changed

src/main/java/src/TasksFrame.java

@@ -146,7 +146,7 @@ public class TasksFrame extends JFrame {
         });
     }
 
-    private double kreisUmfang(double radius) {
+    public double kreisUmfang(double radius) {
 
         double result = 2 * Math.PI * radius;
         double roundOff = Math.round(result * 100.0) / 100.0;

src/test/java/src/TasksFrameTest.java

@@ -238,6 +238,17 @@ class TasksFrameTest {
         double c = tasksFrame.average(0, 12, 38);
         assertEquals(16.67, c);
     }
+
+    @Test
+    void  test_kreisUmfang(){
+        TasksFrame tasksFrame = new TasksFrame();
+        double a = tasksFrame.kreisUmfang(10);
+        assertEquals(62.83, a);
+        double b = tasksFrame.kreisUmfang(28);
+        assertEquals(175.93, b);
+        double c = tasksFrame.kreisUmfang(0);
+        assertEquals(0, c);
+    }
 }