assertThat(graph.getIncomingEdges("A").size(), is(0));
}
@Test
public void testGetEdges() {
assertTrue(graph.getEdges(Arrays.asList("A")).containsAll(Arrays.asList(new StringEdge("A", "B"), new StringEdge("A", "C"))));
assertTrue(graph.getEdges(Arrays.asList("A", "B")).containsAll(Arrays.asList(new StringEdge("A", "B"), new StringEdge("A", "C"), new StringEdge("B", "C"))));
}