@Test
public void getEdge() {

	Graph<Task, Dependency> app = new Graph<Task, Dependency>();
	Task task = new Task("x");
	Task task2 = new Task("y");
	Dependency e = new Dependency("e");
	app.addEdge(e, task, task2);
	Assert.assertEquals(e, app.getEdge(e));
	Assert.assertTrue(app.containsVertex(task));
	Assert.assertTrue(app.containsVertex(task2));
}