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// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package les
import (
"math/rand"
"testing"
)
type testWrsItem struct {
idx int
widx *int
}
func (t *testWrsItem) Weight() int64 {
w := *t.widx
if w == -1 || w == t.idx {
return int64(t.idx + 1)
}
return 0
}
func TestWeightedRandomSelect(t *testing.T) {
testFn := func(cnt int) {
s := newWeightedRandomSelect()
w := -1
list := make([]testWrsItem, cnt)
for i := range list {
list[i] = testWrsItem{idx: i, widx: &w}
s.update(&list[i])
}
w = rand.Intn(cnt)
c := s.choose()
if c == nil {
t.Errorf("expected item, got nil")
} else {
if c.(*testWrsItem).idx != w {
t.Errorf("expected another item")
}
}
w = -2
if s.choose() != nil {
t.Errorf("expected nil, got item")
}
}
testFn(1)
testFn(10)
testFn(100)
testFn(1000)
testFn(10000)
testFn(100000)
testFn(1000000)
}
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