test case passed

Crypto/src/ROT13.java

-import static java.lang.Character.isLowerCase;
-import static java.lang.Character.isUpperCase;
-import static java.lang.Character.toLowerCase;
 
 public class ROT13  {
 
+    Integer diff;
     ROT13(Character cs, Character cf) {
+        this.diff=Math.abs((int)cs-(int)cf);
+
     }
 
     ROT13() {
 
 
     public String crypt(String text) throws UnsupportedOperationException {
-
-        return "";
+        String str="";
+
+        for (int i=0; i<text.length(); i++)
+        {
+            if(!Character.isLetter(text.charAt(i)))
+            {
+                str+=text.charAt(i);
+            }
+            else if (Character.isUpperCase(text.charAt(i)))
+            {
+                char ch = (char)(((int)text.charAt(i) + diff - 65) % 26 + 65);
+                str+=ch;
+            }
+            else if(Character.isLowerCase(text.charAt(i)))
+            {
+                char ch = (char)(((int)text.charAt(i) + diff - 97) % 26 + 97);
+                str+=ch;
+            }
+        }
+        return str;
     }
 
     public String encrypt(String text) {
-        return text;
+
+        return crypt(text);
     }
 
     public String decrypt(String text) {
-        return text;
+        return crypt(text);
     }
 
-    public static String rotate(String s, Character c) {
-
-        return "";
+    public static String rotate(String string, Character c)
+    {
+        Integer diff=(int)c-(int)'A';
+        return string.substring(diff,string.length())+string.substring(0,diff);
     }
 
 }

Crypto/src/ROT13Test.java

-import org.junit.Test;
 
-import static org.junit.Assert.*;
+import org.testng.annotations.Test;
+import static org.testng.Assert.assertTrue;
 
 public class ROT13Test {
 
         String actual = cipher.encrypt(Q1);
         System.out.println(Q1);
         System.out.println(A1);
+        System.out.println(actual);
         // Then
         assertTrue(actual.equals(A1));
 

pom.xml

     <groupId>com.zipcodewilmington</groupId>
     <artifactId>SimpleCrypt</artifactId>
     <version>1.0-SNAPSHOT</version>
-
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <version>RELEASE</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.testng</groupId>
+            <artifactId>testng</artifactId>
+            <version>RELEASE</version>
+            <scope>compile</scope>
+        </dependency>
+    </dependencies>
 
 </project>