/**
* This test checks an implementation dependent feature. It tests that the method {@code addEdge}
* will silently add the missing nodes to the builder, then add the edge connecting them. We are
* not using the proxy methods here as we want to test {@code addEdge} when the end-points are not
* elements of the graph.
*/
@Test
public void addEdge_builder_nodesNotInGraph() {
addNode(N1);
assertTrue(addEdge(E15, N1, N5));
assertTrue(addEdge(E41, N4, N1));
assertTrue(addEdge(E23, N2, N3));
assertThat(immutableGraph.nodes()).containsExactly(N1, N5, N4, N2, N3).inOrder();
assertThat(immutableGraph.edges()).containsExactly(E15, E41, E23).inOrder();
assertThat(immutableGraph.edgesConnecting(N1, N5)).containsExactly(E15);
assertThat(immutableGraph.edgesConnecting(N4, N1)).containsExactly(E41);
assertThat(immutableGraph.edgesConnecting(N2, N3)).containsExactly(E23);
assertThat(immutableGraph.edgesConnecting(N3, N2)).containsExactly(E23);
}
@Test
public void addEdge_builder_existingNodes() {
// Adding nodes initially for safety (insulating from possible future
// modifications to proxy methods)
addNode(N1);
addNode(N2);
assertTrue(addEdge(E12, N1, N2));
assertThat(immutableGraph.edges()).contains(E12);
assertThat(immutableGraph.edgesConnecting(N1, N2)).containsExactly(E12);
assertThat(immutableGraph.edgesConnecting(N2, N1)).containsExactly(E12);
}
@Test
public void edgesConnecting_oneEdge() {
addEdge(E12, N1, N2);
assertThat(immutableGraph.edgesConnecting(N1, N2)).containsExactly(E12);
assertThat(immutableGraph.edgesConnecting(N2, N1)).containsExactly(E12);
}