@Test
public void graphWithTwoNodesAndTwoNeighbours() throws Exception {
Node node = new Node("1");
node.addNeighbour(new Node("3"));
Node node2 = new Node("2");
node2.addNeighbour(new Node("4"));
graph.add(node);
graph.add(node2);
assertEquals("1 3\n2 4\n", serializeGraph());
}
@Test
public void graphWithOneNodeAndOneNeighbourReturnsNodeAndNeighbour() throws Exception {
Node node = new Node("1");
node.addNeighbour(new Node("2"));
graph.add(node);
assertEquals("1 2\n", serializeGraph());
}