@Test
public void shouldHaveNoCycles() {
Graph<String> graph = new Graph<>();
packageDependencies.forEach(
(key, set) -> {
Node<String> node = graph.findOrCreateNode(key);
set.stream()
.filter(packageDependencies::containsKey)
.forEach(target -> node.linkedTo(graph.findOrCreateNode(target)));
});
graph.topologicalSort();
System.out.println("----------------------- dependencies:");
System.out.println(graph.toString());
System.out.println("-----------------------");
}
