done

Crypto/src/ROT13.java

-import static java.lang.Character.isLowerCase;
-import static java.lang.Character.isUpperCase;
-import static java.lang.Character.toLowerCase;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.util.Collections;
+import java.util.Scanner;
 
 public class ROT13  {
 
+    private int shift;
+
     ROT13(Character cs, Character cf) {
+        this.shift = cs-cf;
     }
 
     ROT13() {
+        shift = 13;
     }
 
 
     public String crypt(String text) throws UnsupportedOperationException {
 
-        return "";
+        StringBuilder build = new StringBuilder();
+        char[] arr = text.toCharArray();
+        for (char a: arr) {
+            char c = a;
+            if((c >= 'a' && c<= 'm') || (c >= 'A' && c<= 'M')){
+                c += 13;
+            }
+            else if((c >= 'n' && c <= 'z') || (c>= 'N' && c <= 'Z')){
+                c-= 13;
+            }
+            build.append(c);
+        }
+        return build.toString();
     }
 
+
+
+
     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) {
+        String rotate = s.substring(s.indexOf(c));
+        String rotateNext = s.substring(0,s.indexOf(c));
+
+
+        return rotate.concat(rotateNext);
+    }
+
+    public String encrptFile(String filename) throws FileNotFoundException{
+        StringBuilder build = new StringBuilder();
+
+        File f = new File(filename);
+        try(Scanner scan = new Scanner(f)){
+            while(scan.hasNextLine()){
+
+                String line = scan.nextLine();
+                String rot13 = this.encrypt(line);
+                build.append(rot13+ "\n");
+            }
+        }
+        catch (FileNotFoundException e){
+            e.printStackTrace();
+        }
+
+
 
-        return "";
+        return build.toString();
     }
 
 }

Crypto/src/ROT13Test.java

 import org.junit.Test;
 
+import java.io.File;
+import java.io.FileNotFoundException;
+
 import static org.junit.Assert.*;
 
 public class ROT13Test {
         assertTrue(actual.equals(Q1));
     }
 
+    @Test
+    public void sonnetEnc() throws FileNotFoundException {
+        ROT13 rot13 = new ROT13();
+        //File filename = new File("sonnet18.enc");
+        String expected = rot13.encrypt("Shall I compare thee to a summer’s day?\n" +
+                "Thou art more lovely and more temperate:\n" +
+                "Rough winds do shake the darling buds of May,\n" +
+                "And summer’s lease hath all too short a date;\n" +
+                "Sometime too hot the eye of heaven shines,\n" +
+                "And often is his gold complexion dimm'd;\n" +
+                "And every fair from fair sometime declines,\n" +
+                "By chance or nature’s changing course untrimm'd;\n" +
+                "But thy eternal summer shall not fade,\n" +
+                "Nor lose possession of that fair thou ow’st;\n" +
+                "Nor shall death brag thou wander’st in his shade,\n" +
+                "When in eternal lines to time thou grow’st:\n" +
+                "   So long as men can breathe or eyes can see,\n" +
+                "   So long lives this, and this gives life to thee.\n");
+
+        String actual = rot13.encrptFile("sonnet18.txt");
+
+        assertEquals(expected,actual);
+    }
+
 }

pom.xml

     <groupId>com.zipcodewilmington</groupId>
     <artifactId>SimpleCrypt</artifactId>
     <version>1.0-SNAPSHOT</version>
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>RELEASE</version>
+            <scope>compile</scope>
+        </dependency>
+    </dependencies>
 
 
 </project>

sonnet18.enc

+Funyy V pbzcner gurr gb n fhzzre’f qnl?
+Gubh neg zber ybiryl naq zber grzcrengr:
+Ebhtu jvaqf qb funxr gur qneyvat ohqf bs Znl,
+Naq fhzzre’f yrnfr ungu nyy gbb fubeg n qngr;
+Fbzrgvzr gbb ubg gur rlr bs urnira fuvarf,
+Naq bsgra vf uvf tbyq pbzcyrkvba qvzz'q;
+Naq rirel snve sebz snve fbzrgvzr qrpyvarf,
+Ol punapr be angher’f punatvat pbhefr hagevzz'q;
+Ohg gul rgreany fhzzre funyy abg snqr,
+Abe ybfr cbffrffvba bs gung snve gubh bj’fg;
+Abe funyy qrngu oent gubh jnaqre’fg va uvf funqr,
+Jura va rgreany yvarf gb gvzr gubh tebj’fg:
+   Fb ybat nf zra pna oerngur be rlrf pna frr,
+   Fb ybat yvirf guvf, naq guvf tvirf yvsr gb gurr.