Add: NeonNumber algorithm with test class

Author: AshishKumar1297

src/main/java/com/thealgorithms/maths/NeonNumber.java

@@ -1,14 +1,13 @@
 package com.thealgorithms.maths;
 
-import java.util.Scanner;
-
 public class NeonNumber {
 
     /**
      * Check if a number is Neon Number.
      * A neon number is a number where a sum of digits of its square equals the number itself.
      * Example : 9--> 9^2 = 81  --> 8+1 = 9
-     *
+     * @see <a href="https://en.wikipedia.org/wiki/Recreational_mathematics">
+     *         *    Wikipedia - Recreational Mathematics</a>
      * @param number the number to check
      * @return true if neon number, else --> false
       */
@@ -24,18 +23,5 @@ public static boolean isNeon(int number)
         return digitSum == number;
     }
 
-    public static void main(String[] args) {
-        Scanner scanner = new Scanner(System.in);
-        System.out.println("Enter a number: ");
-        int number = scanner.nextInt();
-
-        if(isNeon(number)){
-            System.out.println(number + " is a Neon Numner ");
-        } else {
-            System.out.println(number + " is not a Neon Number ");
-        }
-        scanner.close();
-    }
-}
 
- //
+}

src/test/java/com/thealgorithms/maths/NeonNumberTest.java

@@ -0,0 +1,22 @@
+package com.thealgorithms.maths;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class NeonNumberTest {
+
+    @Test
+    public void testIsNeonTrue(){
+        assertTrue(NeonNumber.isNeon(9));
+        assertTrue(NeonNumber.isNeon(1));
+        assertTrue(NeonNumber.isNeon(0));
+    }
+    @Test
+    public void testIsNeonFalse()
+    {
+        assertFalse(NeonNumber.isNeon(5));
+        assertFalse(NeonNumber.isNeon(10));
+        assertFalse(NeonNumber.isNeon(25));
+    }
+}