add JUint tests, remove main method, and format code

Author: MohamedBoukthir

src/main/java/com/thealgorithms/Recursion/FibonacciSeries.java

@@ -8,17 +8,10 @@
 */
 
 public class FibonacciSeries {
-
     static int fib(int n) {
-        if (n == 0 || n ==1)
+        if (n == 0 || n == 1)
             return n;
         else
             return fib(n - 1) + fib(n - 2);
     }
-
-    public static void main(String[] args) {
-        System.out.println("Fibonacci = " + fib(1)); // Fibonacci = 1
-        System.out.println("Fibonacci = " + fib(0)); // Fibonacci = 0
-        System.out.println("Fibonacci = " + fib(14)); // Fibonacci = 377
-    }
 }

src/test/java/com/thealgorithms/Recursion/FibonacciSeriesTest.java

@@ -0,0 +1,27 @@
+package com.thealgorithms.Recursion;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import org.junit.jupiter.api.Test;
+
+public class FibonacciSeriesTest {
+
+    @Test
+    public void testFibonacci() {
+        assertEquals(0, FibonacciSeries.fib(0));
+        assertEquals(1, FibonacciSeries.fib(1));
+        assertEquals(1, FibonacciSeries.fib(2));
+        assertEquals(2, FibonacciSeries.fib(3));
+        assertEquals(3, FibonacciSeries.fib(4));
+        assertEquals(5, FibonacciSeries.fib(5));
+        assertEquals(8, FibonacciSeries.fib(6));
+        assertEquals(13, FibonacciSeries.fib(7));
+        assertEquals(21, FibonacciSeries.fib(8));
+        assertEquals(34, FibonacciSeries.fib(9));
+        assertEquals(55, FibonacciSeries.fib(10));
+        assertEquals(89, FibonacciSeries.fib(11));
+        assertEquals(144, FibonacciSeries.fib(12));
+        assertEquals(233, FibonacciSeries.fib(13));
+        assertEquals(377, FibonacciSeries.fib(14));
+    }
+
+}