public void testHamiltonEuler() {
path = path.append(newEdge(0, 1).asPath());
// 0--1
assertTrue(path.isHamilton());
assertTrue(path.isEuler());
path = path.append(newEdge(1, 0).asPath());
// 0--1--0
assertFalse(path.isHamilton());
assertTrue(path.isEuler());
path = path.append(newEdge(0, 2).asPath());
// 0--1--0--2
assertFalse(path.isHamilton());
assertTrue(path.isEuler());
path = path.append(newEdge(2, 1).asPath());
// 0--1--0--2--1
assertFalse(path.isHamilton());
assertTrue(path.isEuler());
path = path.append(g.anEdge(n[1], n[0]).asPath());
// 0--1--0--2--1--0
assertFalse(path.isHamilton());
assertFalse(path.isEuler());
}
public void testToString() {
assertEquals("[1]", path.toString());
path = path.append(newEdge(0, 1).asPath());
assertEquals("[1-->2]", path.toString());
Edge e = newEdge(2, 1);
path = path.append(e.asPath(e.n2()));
assertEquals("[1-->2<--3]", path.toString());
}
public void testSize() {
assertEquals(0, path.size());
checkSizeInvariants();
path = path.append(newEdge(0).asPath());
assertEquals(1, path.size());
checkSizeInvariants();
path = path.append(newEdge(1).asPath());
assertEquals(2, path.size());
checkSizeInvariants();
}
public void testIsCycle() {
assertFalse(path.isCycle());
path = path.append(newEdge(0).asPath());
assertFalse(path.isCycle());
path = path.append(newEdge(1, 0).asPath());
assertTrue(path.isCycle());
path = path.append(newEdge(0).asPath());
assertFalse(path.isCycle());
assertTrue(path.split(1)[1].isCycle());
}
public void testEquality() {
checkEqual(path, path, true);
checkEqual(path, n[0].asPath(), true);
Path p2 = path.append(newEdge(0).asPath());
checkEqual(path, p2, false);
path = path.append(g.anEdge(n[0], n[1]).asPath());
checkEqual(path, p2, true);
path = path.tailPath(0);
checkEqual(path, p2, false);
p2 = p2.tailPath(0);
checkEqual(path, p2, true);
}
public void testIndexedGets() {
Edge[] edges = {newEdge(0), newEdge(1), newEdge(2), newEdge(3)};
for (Edge e : edges) {
path = path.append(e.asPath());
}
checkIndexedGets(path, edges, false);
}
public void testEdge() {
try {
path.tailEdge();
fail();
} catch (NoSuchElementException ok) {
}
assertEquals(n[0], path.headNode());
assertEquals(n[0], path.tailNode());
Edge e = newEdge(0);
path = path.append(e.asPath());
assertEquals(e, path.tailEdge());
assertEquals(e.n2(), path.tailNode());
e = newEdge(1);
path = path.append(e.asPath());
assertEquals(e, path.tailEdge());
assertEquals(e.n2(), path.tailNode());
}
public void testAppend() {
Path p2 = n[1].asPath();
p2 = p2.append(newEdge(1).asPath());
try {
Path p3 = path.append(p2);
fail("Allowed illegal path concatenation");
} catch (RuntimeException e) {
// ok
}
Path p3 = newEdge(0).asPath();
path = path.append(p3);
assertEquals(1, path.size());
path = path.append(newEdge(1).asPath());
assertEquals(2, path.size());
path = path.tailPath(1);
assertEquals(1, path.size());
assertEquals(n[1], path.headNode());
assertEquals(n[2], path.tailNode());
}
public void testNodes() {
Edge[] edges = {newEdge(0), newEdge(1), newEdge(2), newEdge(3)};
for (Edge e : edges) {
path = path.append(e.asPath());
}
List<Node> nodes = path.nodes().drainToList();
for (int i = 0; i < edges.length; i++) {
assertEquals(edges[i].n1(), nodes.get(i));
}
assertEquals(edges[edges.length - 1].n2(), nodes.get(nodes.size() - 1));
}
public void testInverse() {
Edge[] edges = {newEdge(0), newEdge(1), newEdge(2), newEdge(3)};
for (Edge e : edges) {
path = path.append(e.asPath());
}
path = path.reverse();
checkIndexedGets(path, new Edge[] {edges[3], edges[2], edges[1], edges[0]}, true);
assertEquals(n[4], path.headNode());
assertEquals(path.getEdge(0), g.anEdge(n[4], n[3]));
assertEquals(path.getEdge(1), g.anEdge(n[3], n[2]));
assertEquals(path.getEdge(2), g.anEdge(n[2], n[1]));
assertEquals(path.getEdge(3), g.anEdge(n[1], n[0]));
}
public void testSlices() {
Edge[] edges = {newEdge(0), newEdge(1), newEdge(2), newEdge(3)};
for (Edge e : edges) {
path = path.append(e.asPath());
}
Path p2 = path.slice(1, 3);
assertEquals(2, p2.size());
assertEquals(edges[1], p2.steps().iterator().next().tailEdge());
assertEquals(edges[2], p2.tailEdge());
try {
path.slice(2, 1);
fail("Allowed illegal path slice arguments");
} catch (RuntimeException e) {
// ok
}
p2 = path.slice(1, 1);
assertEquals(0, p2.size());
assertEquals(p2.headNode(), p2.tailNode());
assertEquals(n[1], p2.headNode());
p2 = path.headPath(1);
assertEquals(1, p2.size());
assertEquals(n[0], p2.headNode());
assertEquals(n[1], p2.tailNode());
try {
path.headPath(-1);
fail("Allowed illegal head path argument");
} catch (RuntimeException e) {
// ok
}
p2 = path.tailPath(1);
assertEquals(1, p2.size());
assertEquals(n[4], p2.tailNode());
assertEquals(n[3], p2.headNode());
try {
path.tailPath(-1);
fail("Allowed illegal tail path argument");
} catch (RuntimeException e) {
// ok
}
}
public void testSplit() {
Edge[] edges = {newEdge(0), newEdge(1), newEdge(2), newEdge(3)};
for (Edge e : edges) {
path = path.append(e.asPath());
}
Path[] paths = path.split(2);
assertEquals(2, paths[0].size());
assertEquals(2, paths[1].size());
assertEquals(n[0], paths[0].headNode());
assertEquals(n[2], paths[0].tailNode());
assertEquals(n[2], paths[1].headNode());
assertEquals(n[4], paths[1].tailNode());
paths = paths[1].split(2);
assertEquals(2, paths[0].size());
assertEquals(0, paths[1].size());
assertEquals(n[4], paths[1].headNode());
assertEquals(n[4], paths[1].tailNode());
}
public void testReplaceFirst() {
path = path.append(newEdge(0).asPath()).append(newEdge(1).asPath());
Path p = path.replaceFirst(g.anEdge(n[0], n[1]).asPath(), n[1].asPath());
assertEquals(1, p.size());
assertEquals(n[1], p.headNode());
assertEquals(n[2], p.tailNode());
try {
Path p2 = path.replaceFirst(g.anEdge(n[0], n[1]).asPath(), n[0].asPath());
fail("Illegal replacement path allowed");
} catch (RuntimeException e) {
// ok
}
try {
Path p3 = path.replaceFirst(g.anEdge(n[0], n[1]).asPath(), g.newEdge(n[0], n[2]).asPath());
fail("Illegal replacement path allowed");
} catch (RuntimeException e) {
// ok
}
}
public void testFindAndContains() {
path = path.append(newEdge(0).asPath()).append(newEdge(1).asPath());
Path temp;
temp = g.anEdge(n[0], n[1]).asPath();
assertEquals(0, path.find(temp));
assertTrue(path.contains(temp));
temp = g.anEdge(n[1], n[2]).asPath();
assertEquals(1, path.find(temp));
assertTrue(path.contains(temp));
temp = path;
assertEquals(0, path.find(temp));
assertTrue(path.contains(temp));
temp = path;
assertEquals(-1, path.find(path, 1));
assertTrue(path.contains(temp));
temp = n[2].asPath();
assertEquals(2, path.find(temp));
assertTrue(path.contains(temp));
}