Add a "fork" mode test to help catch issues
diff --git a/ts-test/pom.xml b/ts-test/pom.xml
index 790f09e..c6bf644 100644
--- a/ts-test/pom.xml
+++ b/ts-test/pom.xml
@@ -73,6 +73,7 @@
                     </execution>
                 </executions>
                 <configuration>
+                    <fork>true</fork>
                     <xsdOptions>
                         <xsdOption>
                             <extension>true</extension>