| // Copyright ©2014 The Gonum Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package multi_test |
| |
| import ( |
| "testing" |
| |
| "golang.org/x/exp/rand" |
| |
| "gonum.org/v1/gonum/graph" |
| "gonum.org/v1/gonum/graph/internal/set" |
| "gonum.org/v1/gonum/graph/iterator" |
| "gonum.org/v1/gonum/graph/multi" |
| "gonum.org/v1/gonum/graph/testgraph" |
| ) |
| |
| func weightedDirectedBuilder(nodes []graph.Node, edges []testgraph.WeightedLine, self, absent float64) (g graph.Graph, n []graph.Node, e []testgraph.Edge, s, a float64, ok bool) { |
| seen := set.NewNodes() |
| dg := multi.NewWeightedDirectedGraph() |
| dg.EdgeWeightFunc = func(l graph.WeightedLines) float64 { |
| if l.Len() == 0 { |
| return absent |
| } |
| var w float64 |
| for l.Next() { |
| w += l.WeightedLine().Weight() |
| } |
| l.Reset() |
| return w |
| } |
| for _, n := range nodes { |
| seen.Add(n) |
| dg.AddNode(n) |
| } |
| for _, edge := range edges { |
| f := dg.Node(edge.From().ID()) |
| if f == nil { |
| f = edge.From() |
| } |
| t := dg.Node(edge.To().ID()) |
| if t == nil { |
| t = edge.To() |
| } |
| cl := multi.WeightedLine{F: f, T: t, UID: edge.ID(), W: edge.Weight()} |
| seen.Add(cl.F) |
| seen.Add(cl.T) |
| e = append(e, cl) |
| dg.SetWeightedLine(cl) |
| } |
| if len(seen) != 0 { |
| n = make([]graph.Node, 0, len(seen)) |
| } |
| for _, sn := range seen { |
| n = append(n, sn) |
| } |
| return dg, n, e, self, absent, true |
| } |
| |
| func TestWeightedDirected(t *testing.T) { |
| t.Run("EdgeExistence", func(t *testing.T) { |
| testgraph.EdgeExistence(t, weightedDirectedBuilder) |
| }) |
| t.Run("LineExistence", func(t *testing.T) { |
| testgraph.LineExistence(t, directedBuilder, true) |
| }) |
| t.Run("NodeExistence", func(t *testing.T) { |
| testgraph.NodeExistence(t, weightedDirectedBuilder) |
| }) |
| t.Run("ReturnAdjacentNodes", func(t *testing.T) { |
| testgraph.ReturnAdjacentNodes(t, weightedDirectedBuilder, true) |
| }) |
| t.Run("ReturnAllLines", func(t *testing.T) { |
| testgraph.ReturnAllLines(t, weightedDirectedBuilder, true) |
| }) |
| t.Run("ReturnAllNodes", func(t *testing.T) { |
| testgraph.ReturnAllNodes(t, weightedDirectedBuilder, true) |
| }) |
| t.Run("ReturnAllWeightedLines", func(t *testing.T) { |
| testgraph.ReturnAllWeightedLines(t, weightedDirectedBuilder, true) |
| }) |
| t.Run("ReturnNodeSlice", func(t *testing.T) { |
| testgraph.ReturnNodeSlice(t, weightedDirectedBuilder, true) |
| }) |
| t.Run("Weight", func(t *testing.T) { |
| testgraph.Weight(t, weightedDirectedBuilder) |
| }) |
| |
| t.Run("AddNodes", func(t *testing.T) { |
| testgraph.AddNodes(t, multi.NewWeightedDirectedGraph(), 100) |
| }) |
| t.Run("AddArbitraryNodes", func(t *testing.T) { |
| testgraph.AddArbitraryNodes(t, |
| multi.NewWeightedDirectedGraph(), |
| testgraph.NewRandomNodes(100, 1, func(id int64) graph.Node { return multi.Node(id) }), |
| ) |
| }) |
| t.Run("RemoveNodes", func(t *testing.T) { |
| g := multi.NewWeightedDirectedGraph() |
| it := testgraph.NewRandomNodes(100, 1, func(id int64) graph.Node { return multi.Node(id) }) |
| for it.Next() { |
| g.AddNode(it.Node()) |
| } |
| it.Reset() |
| rnd := rand.New(rand.NewSource(1)) |
| for it.Next() { |
| u := it.Node() |
| d := rnd.Intn(5) |
| vit := g.Nodes() |
| for d >= 0 && vit.Next() { |
| v := vit.Node() |
| d-- |
| g.SetWeightedLine(g.NewWeightedLine(u, v, 1)) |
| } |
| } |
| testgraph.RemoveNodes(t, g) |
| }) |
| t.Run("AddWeightedLines", func(t *testing.T) { |
| testgraph.AddWeightedLines(t, 100, |
| multi.NewWeightedDirectedGraph(), |
| 0.5, |
| func(id int64) graph.Node { return multi.Node(id) }, |
| true, // Can update nodes. |
| ) |
| }) |
| t.Run("RemoveLines", func(t *testing.T) { |
| g := multi.NewWeightedDirectedGraph() |
| it := testgraph.NewRandomNodes(100, 1, func(id int64) graph.Node { return multi.Node(id) }) |
| for it.Next() { |
| g.AddNode(it.Node()) |
| } |
| it.Reset() |
| var lines []graph.Line |
| rnd := rand.New(rand.NewSource(1)) |
| for it.Next() { |
| u := it.Node() |
| d := rnd.Intn(5) |
| vit := g.Nodes() |
| for d >= 0 && vit.Next() { |
| v := vit.Node() |
| d-- |
| l := g.NewWeightedLine(u, v, 1) |
| g.SetWeightedLine(l) |
| lines = append(lines, l) |
| } |
| } |
| rnd.Shuffle(len(lines), func(i, j int) { |
| lines[i], lines[j] = lines[j], lines[i] |
| }) |
| testgraph.RemoveLines(t, g, iterator.NewOrderedLines(lines)) |
| }) |
| } |
| |
| // Tests Issue #27 |
| func TestWeightedEdgeOvercounting(t *testing.T) { |
| g := generateDummyWeightedGraph() |
| |
| if neigh := graph.NodesOf(g.From(int64(2))); len(neigh) != 2 { |
| t.Errorf("Node 2 has incorrect number of neighbors got neighbors %v (count %d), expected 2 neighbors {0,1}", neigh, len(neigh)) |
| } |
| } |
| |
| func generateDummyWeightedGraph() *multi.WeightedDirectedGraph { |
| nodes := [4]struct{ srcID, targetID int }{ |
| {2, 1}, |
| {1, 0}, |
| {2, 0}, |
| {0, 2}, |
| } |
| |
| g := multi.NewWeightedDirectedGraph() |
| |
| for i, n := range nodes { |
| g.SetWeightedLine(multi.WeightedLine{F: multi.Node(n.srcID), T: multi.Node(n.targetID), W: 1, UID: int64(i)}) |
| } |
| |
| return g |
| } |
| |
| // Test for issue #123 https://github.com/gonum/graph/issues/123 |
| func TestIssue123WeightedDirectedGraph(t *testing.T) { |
| defer func() { |
| if r := recover(); r != nil { |
| t.Errorf("unexpected panic: %v", r) |
| } |
| }() |
| g := multi.NewWeightedDirectedGraph() |
| |
| n0 := g.NewNode() |
| g.AddNode(n0) |
| |
| n1 := g.NewNode() |
| g.AddNode(n1) |
| |
| g.RemoveNode(n0.ID()) |
| |
| n2 := g.NewNode() |
| g.AddNode(n2) |
| } |