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// 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 (
"math"
"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 directedBuilder(nodes []graph.Node, edges []testgraph.WeightedLine, _, _ float64) (g graph.Graph, n []graph.Node, e []testgraph.Edge, s, a float64, ok bool) {
seen := set.NewNodes()
dg := multi.NewDirectedGraph()
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.Line{F: f, T: t, UID: edge.ID()}
seen.Add(cl.F)
seen.Add(cl.T)
e = append(e, cl)
dg.SetLine(cl)
}
if len(seen) != 0 {
n = make([]graph.Node, 0, len(seen))
}
for _, sn := range seen {
n = append(n, sn)
}
return dg, n, e, math.NaN(), math.NaN(), true
}
func TestDirected(t *testing.T) {
t.Run("EdgeExistence", func(t *testing.T) {
testgraph.EdgeExistence(t, directedBuilder, reversesEdges)
})
t.Run("LineExistence", func(t *testing.T) {
testgraph.LineExistence(t, directedBuilder, usesEmpty, reversesEdges)
})
t.Run("NodeExistence", func(t *testing.T) {
testgraph.NodeExistence(t, directedBuilder)
})
t.Run("ReturnAdjacentNodes", func(t *testing.T) {
testgraph.ReturnAdjacentNodes(t, directedBuilder, usesEmpty, reversesEdges)
})
t.Run("ReturnAllLines", func(t *testing.T) {
testgraph.ReturnAllLines(t, directedBuilder, usesEmpty)
})
t.Run("ReturnAllNodes", func(t *testing.T) {
testgraph.ReturnAllNodes(t, directedBuilder, usesEmpty)
})
t.Run("ReturnNodeSlice", func(t *testing.T) {
testgraph.ReturnNodeSlice(t, directedBuilder, usesEmpty)
})
t.Run("AddNodes", func(t *testing.T) {
testgraph.AddNodes(t, multi.NewDirectedGraph(), 100)
})
t.Run("AddArbitraryNodes", func(t *testing.T) {
testgraph.AddArbitraryNodes(t,
multi.NewDirectedGraph(),
testgraph.NewRandomNodes(100, 1, func(id int64) graph.Node { return multi.Node(id) }),
)
})
t.Run("RemoveNodes", func(t *testing.T) {
g := multi.NewDirectedGraph()
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.SetLine(g.NewLine(u, v))
}
}
testgraph.RemoveNodes(t, g)
})
t.Run("AddLines", func(t *testing.T) {
testgraph.AddLines(t, 100,
multi.NewDirectedGraph(),
func(id int64) graph.Node { return multi.Node(id) },
true, // Can update nodes.
)
})
t.Run("RemoveLines", func(t *testing.T) {
g := multi.NewDirectedGraph()
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.NewLine(u, v)
g.SetLine(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 TestEdgeOvercounting(t *testing.T) {
g := generateDummyGraph()
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 generateDummyGraph() *multi.DirectedGraph {
nodes := [4]struct{ srcID, targetID int }{
{2, 1},
{1, 0},
{2, 0},
{0, 2},
}
g := multi.NewDirectedGraph()
for i, n := range nodes {
g.SetLine(multi.Line{F: multi.Node(n.srcID), T: multi.Node(n.targetID), UID: int64(i)})
}
return g
}
// Test for issue #123 https://github.com/gonum/graph/issues/123
func TestIssue123DirectedGraph(t *testing.T) {
defer func() {
if r := recover(); r != nil {
t.Errorf("unexpected panic: %v", r)
}
}()
g := multi.NewDirectedGraph()
n0 := g.NewNode()
g.AddNode(n0)
n1 := g.NewNode()
g.AddNode(n1)
g.RemoveNode(n0.ID())
n2 := g.NewNode()
g.AddNode(n2)
}
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