I have a simple page test based on Testify/TestNG. It's only a smoke test, merely renders the page to make sure I haven't broken anything.
public void test1() { Document doc = tester.renderPage("contacteditor/200"); String contents = doc.toString(); assertTrue(!contents.contains("xception")); assertTrue(!contents.contains("rror")); } It works fine when the page contains the original DateField: <t:datefield t:id="closeDate" value="item.closeDate" class="datefield" style="margin-left:10px;"/> If I switch to the new improved tapx-datefield (change "t:" to "x:"), with the appropriate maven dependency: <dependency> <groupId>com.howardlewisship</groupId> <artifactId>tapx-datefield</artifactId> <version>${tapx-version}</version> </dependency> the page works fine within the app, but the test encounters: Render queue error in BeginRender[ContactEditor:birthday]: Unknown prefix for asset path 'ContactEditor:birthday/calendar.js'. org.apache.tapestry5.ioc.internal.util.TapestryException: Unknown prefix for asset path 'ContactEditor:birthday/calendar.js'. [at classpath: .../pages/ContactEditor.tml, line 108] at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.invoke(ComponentPageElementImpl.java:948) at org.apache.tapestry5.internal.structure.ComponentPageElementImpl.access$400(ComponentPageElementImpl.java:49) at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$AbstractPhase.callback(ComponentPageElementImpl.java:159) at org.apache.tapestry5.internal.structure.ComponentPageElementImpl$BeginRenderPhase.render(ComponentPageElementImpl.java:211) at org.apache.tapestry5.internal.services.RenderQueueImpl.run(RenderQueueImpl.java:74) at org.apache.tapestry5.internal.services.PageRenderQueueImpl.render(PageRenderQueueImpl.java:121) at $PageRenderQueue_127bf92969d.render($PageRenderQueue_127bf92969d.java) at $PageRenderQueue_127bf929694.render($PageRenderQueue_127bf929694.java) at org.apache.tapestry5.internal.services.MarkupRendererTerminator.renderMarkup(MarkupRendererTerminator.java:37) ... This is with Tapestry 5.1.0.5 and Tapx 1.0.0. I've tried changing the dependency scope with no luck.