DijkstraGraphSearchTest.java
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package org.onlab.graph;
import org.junit.Test;
import java.util.Set;
import static com.google.common.collect.ImmutableSet.of;
import static org.junit.Assert.assertEquals;
/**
* Test of the Dijkstra algorithm.
*/
public class DijkstraGraphSearchTest extends BreadthFirstSearchTest {
@Override
protected AbstractGraphPathSearch<TestVertex, TestEdge> graphSearch() {
return new DijkstraGraphSearch<>();
}
@Test
@Override
public void defaultGraphTest() {
executeDefaultTest(7, 5, 5.0);
}
@Test
@Override
public void defaultHopCountWeight() {
weight = null;
executeDefaultTest(10, 3, 3.0);
}
@Test
public void noPath() {
graph = new AdjacencyListsGraph<>(of(A, B, C, D),
of(new TestEdge(A, B, 1),
new TestEdge(B, A, 1),
new TestEdge(C, D, 1),
new TestEdge(D, C, 1)));
GraphPathSearch<TestVertex, TestEdge> gs = graphSearch();
Set<Path<TestVertex, TestEdge>> paths = gs.search(graph, A, B, weight).paths();
printPaths(paths);
assertEquals("incorrect paths count", 1, paths.size());
assertEquals("incorrect path cost", 1.0, paths.iterator().next().cost(), 0.1);
paths = gs.search(graph, A, D, weight).paths();
printPaths(paths);
assertEquals("incorrect paths count", 0, paths.size());
paths = gs.search(graph, A, null, weight).paths();
printPaths(paths);
assertEquals("incorrect paths count", 1, paths.size());
assertEquals("incorrect path cost", 1.0, paths.iterator().next().cost(), 0.1);
}
@Test
public void simpleMultiplePath() {
graph = new AdjacencyListsGraph<>(of(A, B, C, D),
of(new TestEdge(A, B, 1),
new TestEdge(A, C, 1),
new TestEdge(B, D, 1),
new TestEdge(C, D, 1)));
executeSearch(graphSearch(), graph, A, D, weight, 2, 2.0);
}
@Test
public void denseMultiplePath() {
graph = new AdjacencyListsGraph<>(of(A, B, C, D, E, F, G),
of(new TestEdge(A, B, 1),
new TestEdge(A, C, 1),
new TestEdge(B, D, 1),
new TestEdge(C, D, 1),
new TestEdge(D, E, 1),
new TestEdge(D, F, 1),
new TestEdge(E, G, 1),
new TestEdge(F, G, 1),
new TestEdge(A, G, 4)));
executeSearch(graphSearch(), graph, A, G, weight, 5, 4.0);
}
@Test
public void dualEdgeMultiplePath() {
graph = new AdjacencyListsGraph<>(of(A, B, C, D, E, F, G, H),
of(new TestEdge(A, B, 1), new TestEdge(A, C, 3),
new TestEdge(B, D, 2), new TestEdge(B, C, 1),
new TestEdge(B, E, 4), new TestEdge(C, E, 1),
new TestEdge(D, H, 5), new TestEdge(D, E, 1),
new TestEdge(E, F, 1), new TestEdge(F, D, 1),
new TestEdge(F, G, 1), new TestEdge(F, H, 1),
new TestEdge(A, E, 3), new TestEdge(B, D, 1)));
executeSearch(graphSearch(), graph, A, E, weight, 3, 3.0);
}
@Test
public void negativeWeights() {
graph = new AdjacencyListsGraph<>(of(A, B, C, D, E, F, G),
of(new TestEdge(A, B, 1),
new TestEdge(A, C, -1),
new TestEdge(B, D, 1),
new TestEdge(D, A, -2),
new TestEdge(C, D, 1),
new TestEdge(D, E, 1),
new TestEdge(D, F, 1),
new TestEdge(E, G, 1),
new TestEdge(F, G, 1),
new TestEdge(G, A, -5),
new TestEdge(A, G, 4)));
executeSearch(graphSearch(), graph, A, G, weight, 3, 4.0);
}
}