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diff --git a/dol/test/src/test/util/Diff.java b/dol/test/src/test/util/Diff.java
new file mode 100644
index 0000000..dd0f73e
--- /dev/null
+++ b/dol/test/src/test/util/Diff.java
@@ -0,0 +1,46 @@
+package test.util;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+
+/**
+ * Class to diff two files
+ */
+public class Diff {
+
+    /**
+     * Main.
+     *
+     * @param args names of the two files to compare
+     */
+    public static void main(String[] args) throws Exception {
+        if (args.length != 2) {
+            //System.out.println("Usage: java Diff file1 file2");
+            throw new Exception("Usage: java Diff file1 file2");
+        }
+
+        try {
+          BufferedReader fileOneReader = new BufferedReader(new FileReader(args[0]));
+          BufferedReader fileTwoReader = new BufferedReader(new FileReader(args[1]));
+
+          String lineOne, lineTwo;
+          while ((lineOne = fileOneReader.readLine()) != null) {
+              lineTwo = fileTwoReader.readLine();
+              if (lineTwo == null)
+                  throw new Exception("Files are not equal: "
+                          + args[1] + " is shorter.");
+              else if (!lineOne.equals(lineTwo))
+                  throw new Exception("Files do not match.");
+          }
+
+          if ((lineTwo = fileTwoReader.readLine()) != null)
+              throw new Exception("Files are not equal: "
+                      + args[0]  + " is shorter.");
+        }
+        catch (Exception e) {
+          throw e;
+        }
+
+        //System.out.println("Files are equal.");
+    }
+}