[nobug] require core.resources

tests/org.eclipse.wst.dtd.ui.tests/META-INF/MANIFEST.MF

diff --git a/tests/org.eclipse.wst.dtd.ui.tests/META-INF/MANIFEST.MF b/tests/org.eclipse.wst.dtd.ui.tests/META-INF/MANIFEST.MF
index 56c3cb4..cba104a 100644
--- a/tests/org.eclipse.wst.dtd.ui.tests/META-INF/MANIFEST.MF
+++ b/tests/org.eclipse.wst.dtd.ui.tests/META-INF/MANIFEST.MF
@@ -16,6 +16,7 @@
  org.eclipse.ui.views,
  org.eclipse.ui.workbench,
  org.eclipse.ui.workbench.texteditor,
+ org.eclipse.core.resources,
  org.eclipse.wst.dtd.core,
  org.eclipse.wst.dtd.ui,
  org.eclipse.wst.sse.core,