create P21_StringIntoIntegers_Test

src/main/java/org/example/P21_StringIntoInteger.java

@@ -1,10 +1,10 @@
 package org.example;
 
 public class P21_StringIntoInteger {
-    public static void main(String[] args) {
-        String text = "1234";
-        int numar = Integer.valueOf(text);
 
-        System.out.println("The value of the integer is : " + numar);
+
+    public static int stringToInteger(String text) {
+        int number = Integer.valueOf(text);
+        return number;
     }
 }

src/test/java/org/example/P21_StringIntoIntegerTest.java

@@ -0,0 +1,15 @@
+package org.example;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class P21_StringIntoIntegerTest {
+    @Test
+    void getNumber() {
+        String number = "1234";
+        int text = P21_StringIntoInteger.stringToInteger(number);
+        assertEquals(1234, text);
+
+    }
+}