done

src/main/java/HamletParser.java

 import java.io.File;
 import java.io.IOException;
 import java.util.Scanner;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 /**
  * Created by thook on 10/7/15.
 public class HamletParser {
 
     private String hamletData;
+    private Pattern p;
+    private Matcher m;
 
     public HamletParser(){
         this.hamletData = loadFile();
         return hamletData;
     }
 
+
+    public void changeHamletToLeon(){
+        p = Pattern.compile("hamlet", Pattern.CASE_INSENSITIVE);
+        m = p.matcher(hamletData);
+        hamletData = m.replaceAll("Leon");
+    }
+
+    public void changeHoratioToTariq(){
+        p = Pattern.compile("horatio", Pattern.CASE_INSENSITIVE);
+        m = p.matcher(hamletData);
+        hamletData = m.replaceAll("Tariq");
+    }
+
+    public boolean findHamlet(){
+        p = Pattern.compile("hamlet", Pattern.CASE_INSENSITIVE);
+        m = p.matcher(hamletData);
+        return m.find();
+    }
+
+    public boolean findHoratio(){
+        p = Pattern.compile("horatio", Pattern.CASE_INSENSITIVE);
+        m = p.matcher(hamletData);
+        return m.find();
+
+    }
+
+
 }

src/test/java/HamletParserTest.java

+import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Test;
 
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
 import static org.junit.Assert.*;
 
 public class HamletParserTest {
-    private String hamletText;
+
     private HamletParser hamletParser;
 
     @Before
     public void setUp() {
         this.hamletParser = new HamletParser();
-        this.hamletText = hamletParser.getHamletData();
     }
 
     @Test
     public void testChangeHamletToLeon() {
+       hamletParser.changeHamletToLeon();
+       boolean expected = false;
+       boolean actual = hamletParser.findHamlet();
+       Assert.assertEquals(expected, actual);
+
     }
 
     @Test
     public void testChangeHoratioToTariq() {
+        hamletParser.changeHoratioToTariq();
+        boolean expected = false;
+        boolean actual = hamletParser.findHoratio();
+        Assert.assertEquals(expected, actual);
     }
 
     @Test
     public void testFindHoratio() {
+        boolean expected = hamletParser.getHamletData().toLowerCase().contains("horatio");
+        boolean actual = hamletParser.findHoratio();
+        Assert.assertEquals(expected, actual);
     }
 
     @Test
     public void testFindHamlet() {
+        boolean expected = hamletParser.getHamletData().toLowerCase().contains("hamlet");
+        boolean actual = hamletParser.findHamlet();
+        Assert.assertEquals(expected, actual);
     }
 }