Problem with an ImportController

There's also some code based on org.gephi.io.exporter.preview.PDFExporterTest, but it doesn't work:

...
@Before
public void setUp() throws Exception {
  ProjectController pc = Lookup.getDefault().lookup(ProjectController.class);
  pc.newProject();
  Workspace workspace = pc.getCurrentWorkspace();
  Container container = Lookup.getDefault().lookup(ContainerFactory.class).newContainer();
  ImportController importController = Lookup.getDefault().lookup(ImportController.class);

  importController.importFile(SOME_FILE);// Fails here

}
...

Because of another NPE:

java.lang.NullPointerException
        at org.gephi.io.importer.plugin.file.ImporterBuilderCSV.isMatchingImporter(ImporterBuilderCSV.java:53)
        at org.gephi.io.importer.impl.ImportControllerImpl.isFileSupported(ImportControllerImpl.java:342)

Any idea or suggestion?

Artem