| // 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 simple_test |
| |
| import ( |
| "math" |
| "testing" |
| |
| "gonum.org/v1/gonum/graph" |
| "gonum.org/v1/gonum/graph/internal/set" |
| "gonum.org/v1/gonum/graph/simple" |
| "gonum.org/v1/gonum/graph/testgraph" |
| ) |
| |
| func weightedUndirectedBuilder(nodes []graph.Node, edges []graph.WeightedLine, self, absent float64) (g graph.Graph, n []graph.Node, e []graph.Edge, s, a float64, ok bool) { |
| seen := make(set.Nodes) |
| ug := simple.NewWeightedUndirectedGraph(self, absent) |
| for _, n := range nodes { |
| seen.Add(n) |
| ug.AddNode(n) |
| } |
| for _, edge := range edges { |
| if edge.From().ID() == edge.To().ID() { |
| continue |
| } |
| f := ug.Node(edge.From().ID()) |
| if f == nil { |
| f = edge.From() |
| } |
| t := ug.Node(edge.To().ID()) |
| if t == nil { |
| t = edge.To() |
| } |
| ce := simple.WeightedEdge{F: f, T: t, W: edge.Weight()} |
| seen.Add(ce.F) |
| seen.Add(ce.T) |
| e = append(e, ce) |
| ug.SetWeightedEdge(ce) |
| } |
| if len(e) == 0 && len(edges) != 0 { |
| return nil, nil, nil, math.NaN(), math.NaN(), false |
| } |
| if len(seen) != 0 { |
| n = make([]graph.Node, 0, len(seen)) |
| } |
| for _, sn := range seen { |
| n = append(n, sn) |
| } |
| return ug, n, e, self, absent, true |
| } |
| |
| func TestWeightedUndirected(t *testing.T) { |
| t.Run("EdgeExistence", func(t *testing.T) { |
| testgraph.EdgeExistence(t, weightedUndirectedBuilder) |
| }) |
| t.Run("NodeExistence", func(t *testing.T) { |
| testgraph.NodeExistence(t, weightedUndirectedBuilder) |
| }) |
| t.Run("ReturnAdjacentNodes", func(t *testing.T) { |
| testgraph.ReturnAdjacentNodes(t, weightedUndirectedBuilder, true) |
| }) |
| t.Run("ReturnAllEdges", func(t *testing.T) { |
| testgraph.ReturnAllEdges(t, weightedUndirectedBuilder, true) |
| }) |
| t.Run("ReturnAllNodes", func(t *testing.T) { |
| testgraph.ReturnAllNodes(t, weightedUndirectedBuilder, true) |
| }) |
| t.Run("ReturnAllWeightedEdges", func(t *testing.T) { |
| testgraph.ReturnAllWeightedEdges(t, weightedUndirectedBuilder, true) |
| }) |
| t.Run("ReturnEdgeSlice", func(t *testing.T) { |
| testgraph.ReturnEdgeSlice(t, weightedUndirectedBuilder, true) |
| }) |
| t.Run("ReturnWeightedEdgeSlice", func(t *testing.T) { |
| testgraph.ReturnWeightedEdgeSlice(t, weightedUndirectedBuilder, true) |
| }) |
| t.Run("ReturnNodeSlice", func(t *testing.T) { |
| testgraph.ReturnNodeSlice(t, weightedUndirectedBuilder, true) |
| }) |
| t.Run("Weight", func(t *testing.T) { |
| testgraph.Weight(t, weightedUndirectedBuilder) |
| }) |
| } |
| |
| func TestAssertWeightedMutableNotDirected(t *testing.T) { |
| var g graph.UndirectedWeightedBuilder = simple.NewWeightedUndirectedGraph(0, math.Inf(1)) |
| if _, ok := g.(graph.Directed); ok { |
| t.Fatal("Graph is directed, but a MutableGraph cannot safely be directed!") |
| } |
| } |
| |
| func TestWeightedMaxID(t *testing.T) { |
| g := simple.NewWeightedUndirectedGraph(0, math.Inf(1)) |
| nodes := make(map[graph.Node]struct{}) |
| for i := simple.Node(0); i < 3; i++ { |
| g.AddNode(i) |
| nodes[i] = struct{}{} |
| } |
| g.RemoveNode(int64(0)) |
| delete(nodes, simple.Node(0)) |
| g.RemoveNode(int64(2)) |
| delete(nodes, simple.Node(2)) |
| n := g.NewNode() |
| g.AddNode(n) |
| if g.Node(n.ID()) == nil { |
| t.Error("added node does not exist in graph") |
| } |
| if _, exists := nodes[n]; exists { |
| t.Errorf("Created already existing node id: %v", n.ID()) |
| } |
| } |
| |
| // Test for issue #123 https://github.com/gonum/graph/issues/123 |
| func TestIssue123WeightedUndirectedGraph(t *testing.T) { |
| defer func() { |
| if r := recover(); r != nil { |
| t.Errorf("unexpected panic: %v", r) |
| } |
| }() |
| g := simple.NewWeightedUndirectedGraph(0, math.Inf(1)) |
| |
| n0 := g.NewNode() |
| g.AddNode(n0) |
| |
| n1 := g.NewNode() |
| g.AddNode(n1) |
| |
| g.RemoveNode(n0.ID()) |
| |
| n2 := g.NewNode() |
| g.AddNode(n2) |
| } |