* @throws Exception 例外が発生した場合
*/
@Test
public void no_primary_importers() throws Exception {
FlowDescriptionDriver flow = new FlowDescriptionDriver();
In<Ex1> in1 = flow.createIn("in1", new DirectImporterDescription(Ex1.class, "a/a"));
Out<Ex1> out1 = flow.createOut("out1", new Export("primary"));
FlowDescription desc = new IdentityFlow<Ex1>(in1, out1);
JobflowInfo info = compile(flow, desc);
assertThat(info, not(nullValue()));