IoCore { public static Io.Builder<GraphMLIo> graphml() { return GraphMLIo.build(); } private  IoCore(); static Io.Builder<GraphMLIo> graphml(); static Io.Builder<GraphSONIo> graphson(); static Io.Builder<GryoIo> gryo(); static Io.Builder createIoBuilder(final String graphFormat);  }
@Test public void shouldCreateAnIoBuilderforGraphML() { assertThat(IoCore.graphml(), instanceOf(GraphMLIo.Builder.class)); }