mergeMappings.setName(NamespaceProperties.MERGE_MAPPINGS_URI);
mergeMappings.setValue(mergeMappingsUri.toString());
final String namespaceName = "test-namespace";
final Namespace namespace = new Namespace();
namespace.setName(namespaceName);
namespace.addProperty(mergeMappings);
Namespaces.instance().addNamespace(namespace);
final VelocityTemplateEngine engine = new VelocityTemplateEngine();
engine.initialize(namespaceName);
StringWriter writer = new StringWriter();
String path = packagePath + "/merge-test.vsl";