diff --git a/odfdom/src/test/java/org/odftoolkit/odfdom/changes/RoundtripTest.java b/odfdom/src/test/java/org/odftoolkit/odfdom/changes/RoundtripTest.java
index 6de794542..98d385b5c 100644
--- a/odfdom/src/test/java/org/odftoolkit/odfdom/changes/RoundtripTest.java
+++ b/odfdom/src/test/java/org/odftoolkit/odfdom/changes/RoundtripTest.java
@@ -88,6 +88,10 @@ private static void addFilesFromFolder(final File folder, Collection<Object[]> t
             && !filePath.contains("textTestTemplate.ott")
             && !filePath.contains("indentTest.odt")
             && !filePath.contains("testInvalidPkg")
+            && !filePath.contains("duplicate-files.odt")
+            && !filePath.contains("unicode-path.odt")
+            && !filePath.contains("slash.odt")
+            && !filePath.contains("two-zips.odt")
             && !filePath.contains("BigTable.odt") // too slow 4 now
             && !filePath.endsWith("PasswordProtected.odt")) {
           //						!filePath.contains("Text1.odt")
diff --git a/odfdom/src/test/java/org/odftoolkit/odfdom/pkg/PackageTest.java b/odfdom/src/test/java/org/odftoolkit/odfdom/pkg/PackageTest.java
index 3cc2e2002..a6186cf4f 100644
--- a/odfdom/src/test/java/org/odftoolkit/odfdom/pkg/PackageTest.java
+++ b/odfdom/src/test/java/org/odftoolkit/odfdom/pkg/PackageTest.java
@@ -397,6 +397,112 @@ public void validationTest() {
     handler4.validate();
   }
 
+  @Test
+  public void validationTest5() {
+    // TESTDOC5: duplicate ZIP entries
+    Map<ValidationConstraint, Integer> expectedFatalErrors =
+        new HashMap<ValidationConstraint, Integer>();
+    expectedFatalErrors.put(OdfPackageConstraint.PACKAGE_ENTRY_DUPLICATE, 1);
+    ErrorHandlerStub handler = new ErrorHandlerStub(null, null, expectedFatalErrors);
+    handler.setTestFilePath("duplicate-files.odt");
+
+    try {
+      try {
+        OdfPackage.loadPackage(
+            new File(ResourceUtilities.getAbsoluteInputPath(handler.getTestFilePath())),
+            null,
+            handler);
+        Assert.fail();
+      } catch (Exception e) {
+        String errorMsg = OdfPackageConstraint.PACKAGE_ENTRY_DUPLICATE.getMessage();
+        if (e.getMessage().indexOf(errorMsg.substring(0, errorMsg.indexOf("%2$s"))) == -1) {
+          Assert.fail();
+        }
+      }
+    } catch (Exception ex) {
+      LOG.log(Level.SEVERE, null, ex);
+      Assert.fail(ex.toString());
+    }
+    handler.validate();
+  }
+
+  @Test
+  public void validationTest6() {
+    // TESTDOC6: Info-ZIP Unicode Path Extra Field with different name
+    Map<ValidationConstraint, Integer> expectedErrors =
+        new HashMap<ValidationConstraint, Integer>();
+    // depending on setUseUnicodeExtraFields this would be reported as
+    // MANIFEST_DOES_NOT_LIST_FILE or as PACKAGE_ENTRY_DUPLICATE
+    expectedErrors.put(OdfPackageConstraint.MANIFEST_DOES_NOT_LIST_FILE, 1);
+    ErrorHandlerStub handler = new ErrorHandlerStub(null, expectedErrors, null);
+    handler.setTestFilePath("unicode-path.odt");
+
+    try {
+      OdfPackage pkg =
+          OdfPackage.loadPackage(
+              new File(ResourceUtilities.getAbsoluteInputPath(handler.getTestFilePath())),
+              null,
+              handler);
+      Assert.assertNotNull(pkg);
+    } catch (Exception ex) {
+      LOG.log(Level.SEVERE, null, ex);
+      Assert.fail(ex.toString());
+    }
+    handler.validate();
+  }
+
+  @Test
+  public void validationTest7() {
+    // TESTDOC7: invalid file name
+    Map<ValidationConstraint, Integer> expectedFatalErrors =
+        new HashMap<ValidationConstraint, Integer>();
+    expectedFatalErrors.put(OdfPackageConstraint.PACKAGE_ENTRY_INVALID_FILE_NAME, 1);
+    ErrorHandlerStub handler = new ErrorHandlerStub(null, null, expectedFatalErrors);
+    handler.setTestFilePath("slash.odt");
+
+    try {
+      try {
+        OdfPackage.loadPackage(
+            new File(ResourceUtilities.getAbsoluteInputPath(handler.getTestFilePath())),
+            null,
+            handler);
+        Assert.fail();
+      } catch (Exception e) {
+        String errorMsg = OdfPackageConstraint.PACKAGE_ENTRY_INVALID_FILE_NAME.getMessage();
+        if (e.getMessage().indexOf(errorMsg.substring(0, errorMsg.indexOf("%2$s"))) == -1) {
+          Assert.fail();
+        }
+      }
+    } catch (Exception ex) {
+      LOG.log(Level.SEVERE, null, ex);
+      Assert.fail(ex.toString());
+    }
+    handler.validate();
+  }
+
+  @Test
+  public void validationTest8() {
+    // TESTDOC8: 2 concatenated zips
+    Map<ValidationConstraint, Integer> expectedErrors =
+        new HashMap<ValidationConstraint, Integer>();
+    expectedErrors.put(OdfPackageConstraint.MIMETYPE_NOT_FIRST_IN_PACKAGE, 1);
+    ErrorHandlerStub handler = new ErrorHandlerStub(null, expectedErrors, null);
+    handler.setTestFilePath("two-zips.odt");
+
+    try {
+      OdfPackage pkg =
+          OdfPackage.loadPackage(
+              new File(ResourceUtilities.getAbsoluteInputPath(handler.getTestFilePath())),
+              null,
+              handler);
+      Assert.assertNotNull(pkg);
+    } catch (Exception ex) {
+      LOG.log(Level.SEVERE, null, ex);
+      Assert.fail(ex.toString());
+    }
+    handler.validate();
+  }
+
   @Test
   public void testPackagePassword() {
     File tmpFile = ResourceUtilities.getTestOutputFile("PackagePassword.ods");
diff --git a/odfdom/src/test/resources/test-input/duplicate-files.odt b/odfdom/src/test/resources/test-input/duplicate-files.odt
new file mode 100644
index 000000000..cc24f7024
Binary files /dev/null and b/odfdom/src/test/resources/test-input/duplicate-files.odt differ
diff --git a/odfdom/src/test/resources/test-input/slash.odt b/odfdom/src/test/resources/test-input/slash.odt
new file mode 100644
index 000000000..22c644349
Binary files /dev/null and b/odfdom/src/test/resources/test-input/slash.odt differ
diff --git a/odfdom/src/test/resources/test-input/two-zips.odt b/odfdom/src/test/resources/test-input/two-zips.odt
new file mode 100644
index 000000000..36d90cb9d
Binary files /dev/null and b/odfdom/src/test/resources/test-input/two-zips.odt differ
diff --git a/odfdom/src/test/resources/test-input/unicode-path.odt b/odfdom/src/test/resources/test-input/unicode-path.odt
new file mode 100644
index 000000000..9edaaeb68
Binary files /dev/null and b/odfdom/src/test/resources/test-input/unicode-path.odt differ