add server core tests to ext tests
diff --git a/features/org.eclipse.jst.server_adapters.ext_tests.feature/feature.xml b/features/org.eclipse.jst.server_adapters.ext_tests.feature/feature.xml
index f1c9f08..846c62b 100644
--- a/features/org.eclipse.jst.server_adapters.ext_tests.feature/feature.xml
+++ b/features/org.eclipse.jst.server_adapters.ext_tests.feature/feature.xml
@@ -26,6 +26,11 @@
          download-size="0"
          install-size="0"
          version="0.0.0"/>
+   <plugin
+         id="org.eclipse.wst.server.ui.tests"
+         download-size="0"
+         install-size="0"
+         version="0.0.0"/>
 
    <plugin
          id="org.eclipse.jst.server.tomcat.core.tests"