done

Crypto/src/ROT13.java

@@ -1,32 +0,0 @@
-import static java.lang.Character.isLowerCase;
-import static java.lang.Character.isUpperCase;
-import static java.lang.Character.toLowerCase;
-
-public class ROT13  {
-
-    ROT13(Character cs, Character cf) {
-    }
-
-    ROT13() {
-    }
-
-
-    public String crypt(String text) throws UnsupportedOperationException {
-
-        return "";
-    }
-
-    public String encrypt(String text) {
-        return text;
-    }
-
-    public String decrypt(String text) {
-        return text;
-    }
-
-    public static String rotate(String s, Character c) {
-
-        return "";
-    }
-
-}

Crypto/src/main/ROT13.java

@@ -0,0 +1,67 @@
+import static java.lang.Character.isLowerCase;
+import static java.lang.Character.isUpperCase;
+import static java.lang.Character.toLowerCase;
+
+public class ROT13  {
+
+    ROT13(Character cs, Character cf) {
+    }
+
+    ROT13() {
+    }
+
+
+    public String crypt(String text) throws UnsupportedOperationException
+    {
+
+        StringBuilder sb = new StringBuilder();
+
+        for(int i = 0; i < text.length(); i++)
+        {
+            char c = text.charAt(i);
+
+            if (c >= 'a' && c <= 'm')
+            {
+                c += 13;
+            }
+            else if (c >= 'A' && c <= 'M')
+            {
+                c += 13;
+            }
+            else if (c >= 'n' && c <= 'z')
+            {
+                c -= 13;
+            }
+            else if (c >= 'N' && c <= 'Z')
+            {
+                c -= 13;
+            }
+
+            sb.append(c);
+
+        }
+
+        return sb.toString();
+    }
+
+    public String encrypt(String text)
+    {
+
+        return crypt(text);
+    }
+
+    public String decrypt(String text)
+    {
+        return crypt(text);
+    }
+
+    public static String rotate(String s, Character c)
+    {
+        int startIndex = s.indexOf(c);
+        StringBuilder sb = new StringBuilder();
+        sb.append(s.substring(startIndex, s.length()));
+        sb.append(s.substring(0, startIndex));
+        return sb.toString();
+    }
+
+}

Crypto/src/ROT13Test.java → Crypto/src/test/ROT13Test.java

@@ -6,7 +6,8 @@ public class ROT13Test {
 
 
     @Test
-    public void rotateStringTest0() {
+    public void rotateStringTest0()
+    {
         // Given
         String s1 = "ABCDEF";
         String s2 = "ABCDEF";

SimpleCrypt.iml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_5">
+    <output url="file://$MODULE_DIR$/target/classes" />
+    <output-test url="file://$MODULE_DIR$/target/test-classes" />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/Crypto/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/Crypto/src/main" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/Crypto/src/test" isTestSource="true" />
+      <excludeFolder url="file://$MODULE_DIR$/target" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="Maven: junit:junit:4.12" level="project" />
+    <orderEntry type="library" name="Maven: org.hamcrest:hamcrest-core:1.3" level="project" />
+  </component>
+</module>

pom.xml

@@ -8,5 +8,13 @@
     <artifactId>SimpleCrypt</artifactId>
     <version>1.0-SNAPSHOT</version>
 
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+        </dependency>
+
+    </dependencies>
 
 </project>