mirror of
https://github.com/gonum/gonum.git
synced 2025-10-05 23:26:52 +08:00
126 lines
3.0 KiB
Go
126 lines
3.0 KiB
Go
// 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 undirectedBuilder(nodes []graph.Node, edges []graph.WeightedLine, _, _ float64) (g graph.Graph, n []graph.Node, e []graph.Edge, s, a float64, ok bool) {
|
|
seen := make(set.Nodes)
|
|
ug := simple.NewUndirectedGraph()
|
|
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.Edge{F: f, T: t}
|
|
seen.Add(ce.F)
|
|
seen.Add(ce.T)
|
|
e = append(e, ce)
|
|
ug.SetEdge(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, math.NaN(), math.NaN(), true
|
|
}
|
|
|
|
func TestUndirected(t *testing.T) {
|
|
t.Run("EdgeExistence", func(t *testing.T) {
|
|
testgraph.EdgeExistence(t, undirectedBuilder)
|
|
})
|
|
t.Run("NodeExistence", func(t *testing.T) {
|
|
testgraph.NodeExistence(t, undirectedBuilder)
|
|
})
|
|
t.Run("ReturnAdjacentNodes", func(t *testing.T) {
|
|
testgraph.ReturnAdjacentNodes(t, undirectedBuilder, true)
|
|
})
|
|
t.Run("ReturnAllEdges", func(t *testing.T) {
|
|
testgraph.ReturnAllEdges(t, undirectedBuilder, true)
|
|
})
|
|
t.Run("ReturnAllNodes", func(t *testing.T) {
|
|
testgraph.ReturnAllNodes(t, undirectedBuilder, true)
|
|
})
|
|
t.Run("ReturnEdgeSlice", func(t *testing.T) {
|
|
testgraph.ReturnEdgeSlice(t, undirectedBuilder, true)
|
|
})
|
|
t.Run("ReturnNodeSlice", func(t *testing.T) {
|
|
testgraph.ReturnNodeSlice(t, undirectedBuilder, true)
|
|
})
|
|
}
|
|
|
|
func TestAssertMutableNotDirected(t *testing.T) {
|
|
var g graph.UndirectedBuilder = simple.NewUndirectedGraph()
|
|
if _, ok := g.(graph.Directed); ok {
|
|
t.Fatal("Graph is directed, but a MutableGraph cannot safely be directed!")
|
|
}
|
|
}
|
|
|
|
func TestMaxID(t *testing.T) {
|
|
g := simple.NewUndirectedGraph()
|
|
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 TestIssue123UndirectedGraph(t *testing.T) {
|
|
defer func() {
|
|
if r := recover(); r != nil {
|
|
t.Errorf("unexpected panic: %v", r)
|
|
}
|
|
}()
|
|
g := simple.NewUndirectedGraph()
|
|
|
|
n0 := g.NewNode()
|
|
g.AddNode(n0)
|
|
|
|
n1 := g.NewNode()
|
|
g.AddNode(n1)
|
|
|
|
g.RemoveNode(n0.ID())
|
|
|
|
n2 := g.NewNode()
|
|
g.AddNode(n2)
|
|
}
|