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package graph
import (
"math/rand"
"testing"
)
func TestComponents(t *testing.T) {
g := New(0)
if mess, diff := diff(Components(g), [][]int{}); diff {
t.Errorf("Components %s", mess)
}
if mess, diff := diff(Connected(g), false); diff {
t.Errorf("Connected %s", mess)
}
g = New(1)
if mess, diff := diff(Components(g), [][]int{{0}}); diff {
t.Errorf("Components %s", mess)
}
if mess, diff := diff(Connected(g), true); diff {
t.Errorf("Connected %s", mess)
}
g.Add(0, 0)
if mess, diff := diff(Components(g), [][]int{{0}}); diff {
t.Errorf("Components %s", mess)
}
if mess, diff := diff(Connected(g), true); diff {
t.Errorf("Connected %s", mess)
}
g = New(4)
g.Add(0, 1)
g.Add(2, 1)
if mess, diff := diff(Components(g), [][]int{{0, 1, 2}, {3}}); diff {
t.Errorf("Components %s", mess)
}
if mess, diff := diff(Connected(g), false); diff {
t.Errorf("Connected %s", mess)
}
g.AddBoth(0, 1)
g.AddBoth(1, 2)
g.AddBoth(2, 3)
g.AddBoth(0, 3)
if mess, diff := diff(Components(g), [][]int{{0, 1, 2, 3}}); diff {
t.Errorf("Components %s", mess)
}
if mess, diff := diff(Connected(g), true); diff {
t.Errorf("Connected %s", mess)
}
}
func BenchmarkConnected(b *testing.B) {
n := 1000
b.StopTimer()
g := New(n)
for i := 0; i < n; i++ {
g.AddBoth(rand.Intn(n), rand.Intn(n))
}
b.StartTimer()
for i := 0; i < b.N; i++ {
_ = Connected(g)
}
}
func BenchmarkComponents(b *testing.B) {
n := 1000
b.StopTimer()
g := New(n)
for i := 0; i < n; i++ {
g.AddBoth(rand.Intn(n), rand.Intn(n))
}
b.StartTimer()
for i := 0; i < b.N; i++ {
_ = Components(g)
}
}
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