diff --git a/enterprise-update-test/src/main/java/org/alfresco/update/tool/dircomp/FileTreeCompareImpl.java b/enterprise-update-test/src/main/java/org/alfresco/update/tool/dircomp/FileTreeCompareImpl.java
index d82a7b0a24..df0f1ba45b 100644
--- a/enterprise-update-test/src/main/java/org/alfresco/update/tool/dircomp/FileTreeCompareImpl.java
+++ b/enterprise-update-test/src/main/java/org/alfresco/update/tool/dircomp/FileTreeCompareImpl.java
@@ -41,16 +41,44 @@ public class FileTreeCompareImpl implements FileTreeCompare
 
     public FileTreeCompareImpl()
     {
-        this(new HashSet<String>(), new HashSet<String>());
+        this(null, null);
     }
     
-    public FileTreeCompareImpl(Set<String> ignorePaths, Set<String> allowedDiffsPath)
+    public FileTreeCompareImpl(Set<String> ignorePaths, Set<String> allowedDiffsPaths)
     {
         // This config MUST be present before any TFile objects etc. are created.
         TConfig config = TConfig.get();
         config.setArchiveDetector(new TArchiveDetector("war|jar|amp", new ZipDriver(IOPoolLocator.SINGLETON)));
+        if (ignorePaths == null)
+        {
+            // Add default ignores
+            ignorePaths = new HashSet<>();
+            ignorePaths.add("alf_data/postgresql/**");
+            ignorePaths.add("META-INF/MANIFEST.MF");
+            ignorePaths.add("META-INF/maven/**");
+            ignorePaths.add("README.txt");
+            ignorePaths.add("uninstall.app/**");
+        }
+        if (allowedDiffsPaths == null)
+        {
+            // Add default paths where certain differences are allowed, e.g. absolute path references.
+            allowedDiffsPaths = new HashSet<>();
+            allowedDiffsPaths.add("common/bin/**");
+            allowedDiffsPaths.add("common/include/**/*.h");
+            allowedDiffsPaths.add("common/lib/**/*.pc");
+            allowedDiffsPaths.add("common/lib/**/*.la");
+            allowedDiffsPaths.add("libreoffice.app/Contents/Resources/bootstraprc");
+            allowedDiffsPaths.add("postgresql/bin/**");
+            allowedDiffsPaths.add("**/*.sh");
+            allowedDiffsPaths.add("**/*.bat");
+            allowedDiffsPaths.add("**/*.ini");
+            allowedDiffsPaths.add("**/*.properties");
+            allowedDiffsPaths.add("**/*.xml");
+            allowedDiffsPaths.add("**/*.sample");
+            allowedDiffsPaths.add("**/*.txt");
+        }
         this.ignorePaths.addAll(ignorePaths);
-        this.allowedDiffsPaths.addAll(allowedDiffsPath);
+        this.allowedDiffsPaths.addAll(allowedDiffsPaths);
     }
     
     @Override
diff --git a/enterprise-update-test/src/test/java/EndToEndIntegrationTest.java b/enterprise-update-test/src/test/java/EndToEndIntegrationTest.java
index 9694d09c10..e19bcb75a6 100644
--- a/enterprise-update-test/src/test/java/EndToEndIntegrationTest.java
+++ b/enterprise-update-test/src/test/java/EndToEndIntegrationTest.java
@@ -6,20 +6,24 @@
  * agreement is prohibited. 
  */
 
-import static org.junit.Assert.*;
-
-import java.io.BufferedReader;
-import java.io.BufferedWriter;
-import java.io.File;
-import java.io.IOException;
-import java.io.InputStreamReader;
-import java.io.OutputStream;
-import java.io.OutputStreamWriter;
-import java.util.ArrayList;
-
+import org.alfresco.update.tool.dircomp.FileTreeCompare;
+import org.alfresco.update.tool.dircomp.FileTreeCompareImpl;
+import org.alfresco.update.tool.dircomp.HtmlResultFormatter;
+import org.alfresco.update.tool.dircomp.ResultSet;
 import org.junit.Before;
+import org.junit.Ignore;
 import org.junit.Test;
 
+import java.io.*;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.Set;
+
+import static org.junit.Assert.assertTrue;
+
 public class EndToEndIntegrationTest
 {
     private final static String JAR_FILE_NAME = "alfresco-update-tool.jar";
@@ -132,14 +136,47 @@ public class EndToEndIntegrationTest
     /**
      * Run the diff tool
      * 
-     * @param src
-     * @param dest
+     * @param path1
+     * @param path2
      */
-    public void compare(File src, File dest)
+    public void compare(File path1, File path2) throws IOException
     {
-        //assertTrue("test not implemented", false);
+        FileTreeCompare comparator = new FileTreeCompareImpl();
+        ResultSet resultSet = comparator.compare(path1.toPath(), path2.toPath());
+
+        File dircompDir = new File(targetDir, "installation-diff");
+        dircompDir.mkdirs();
+
+        // Format the results as an HTML report.
+        File file = new File(dircompDir, "installation-diff-report.html");
+        file.createNewFile();
+
+        HtmlResultFormatter formatter = new HtmlResultFormatter();
+        formatter.setDifferencesOnly(true);
+        try(FileOutputStream fos = new FileOutputStream(file);
+            BufferedOutputStream bos = new BufferedOutputStream(fos))
+        {
+            formatter.format(resultSet, bos);
+        }
     }
-    
+
+    /**
+     * Utility/harness to allow easy testing of {@link #compare(File, File)}.
+     * <p>
+     * Uncomment @Ignore, but do not check in.
+     *
+     * @throws IOException
+     */
+    @Ignore
+    @Test
+    public void bigDiff() throws IOException
+    {
+        Path path1 = Paths.get("/Users/MWard/dev2/alf-installs/alf-5.1-b667");
+        Path path2 = Paths.get("/Users/MWard/dev2/alf-installs/alf-5.1-b669");
+
+        compare(path1.toFile(), path2.toFile());
+    }
+
     /* 
     * Method to execute a command 
     * 
diff --git a/enterprise-update-test/src/test/java/org/alfresco/update/tool/dircomp/HtmlResultFormatterTest.java b/enterprise-update-test/src/test/java/org/alfresco/update/tool/dircomp/HtmlResultFormatterTest.java
index 85d1f3ddf9..6ba39f8c6b 100644
--- a/enterprise-update-test/src/test/java/org/alfresco/update/tool/dircomp/HtmlResultFormatterTest.java
+++ b/enterprise-update-test/src/test/java/org/alfresco/update/tool/dircomp/HtmlResultFormatterTest.java
@@ -68,51 +68,6 @@ public class HtmlResultFormatterTest
 //            System.out.println("File: "+file);
         }
     }
-
-    @Ignore
-    @Test
-    public void bigDiff() throws IOException
-    {
-        Path path1 = Paths.get("/Users/MWard/dev2/alf-installs/alf-5.1-b667");
-        Path path2 = Paths.get("/Users/MWard/dev2/alf-installs/alf-5.1-b669");
-        
-        Set<String> ignores = new HashSet<>();
-        ignores.add("alf_data/postgresql/**");
-        ignores.add("META-INF/MANIFEST.MF");
-        ignores.add("META-INF/maven/**");
-        ignores.add("README.txt");
-        ignores.add("uninstall.app/**");
-
-        // All the patterns will be applied to these files, e.g. they will all have differences
-        // in absolute path references ignored.
-        Set<String> ignoreSpecialDifferences = new HashSet<>();
-        ignoreSpecialDifferences.add("common/bin/**");
-        ignoreSpecialDifferences.add("common/include/**/*.h");
-        ignoreSpecialDifferences.add("common/lib/**/*.pc");
-        ignoreSpecialDifferences.add("common/lib/**/*.la");
-        ignoreSpecialDifferences.add("libreoffice.app/Contents/Resources/bootstraprc");
-        ignoreSpecialDifferences.add("postgresql/bin/**");
-        ignoreSpecialDifferences.add("**/*.sh");
-        ignoreSpecialDifferences.add("**/*.bat");
-        ignoreSpecialDifferences.add("**/*.ini");
-        ignoreSpecialDifferences.add("**/*.properties");
-        ignoreSpecialDifferences.add("**/*.xml");
-        ignoreSpecialDifferences.add("**/*.sample");
-        ignoreSpecialDifferences.add("**/*.txt");
-
-        FileTreeCompare comparator = new FileTreeCompareImpl(ignores, ignoreSpecialDifferences);
-        ResultSet resultSet = comparator.compare(path1, path2);
-        
-        Path file = Files.createTempFile(getClass().getSimpleName(), ".html");
-        HtmlResultFormatter formatter = new HtmlResultFormatter();
-        formatter.setDifferencesOnly(true);
-        try(FileOutputStream fos = new FileOutputStream(file.toFile());
-            BufferedOutputStream bos = new BufferedOutputStream(fos))
-        {
-            formatter.format(resultSet, bos);
-        }
-        System.out.println("File: "+file);
-    }
     
     private void addResult(List<Result> results, String p1, String p2, boolean contentMatch)
     {