public void testMultipleEdgeSimplestCase() {
vertexes.add(vertex1);
vertexes.add(vertex2);
vertex1.addEdge(vertex2, vertex1);
TopologicalSorter<DefaultVertex> sorter = new TopologicalSorter<DefaultVertex>(vertexes);
List<DefaultVertex> result = sorter.sort();
assertSame(vertex2, result.get(0));
assertSame(vertex1, result.get(1));
}
public void testMinimalCycleReturned() {
vertexes.add(vertex1);
vertexes.add(vertex2);
vertexes.add(vertex3);
vertex1.addEdge(vertex2);
vertex3.addEdge(vertex2);
vertex2.addEdge(vertex3);
TopologicalSorter<DefaultVertex> sorter = new TopologicalSorter<DefaultVertex>(vertexes);
assertEquals("2, 3", sorter.findCycle().toString());
}
public void testPickThenCycle() {
vertexes.add(vertex1);
vertexes.add(vertex2);
vertexes.add(vertex3);
vertex3.addEdge(vertex2);
vertex2.addEdge(vertex3);
TopologicalSorter<DefaultVertex> sorter = new TopologicalSorter<DefaultVertex>(vertexes);
sorter.setBreakOnCycle(true);
sorter.sort();
assertEquals("2, 3", sorter.findCycle().toString());
}
public void testTwoCycle() {
vertexes.add(vertex1);
vertexes.add(vertex2);
vertex1.addEdge(vertex2);
vertex2.addEdge(vertex1);
TopologicalSorter<DefaultVertex> sorter = new TopologicalSorter<DefaultVertex>(vertexes);
assertEquals("1, 2", sorter.findCycle().toString());
List<DefaultVertex> result = sorter.sort();
assertEquals(2, result.size());
}