mirror of https://github.com/status-im/op-geth.git
69 lines
1.6 KiB
Go
69 lines
1.6 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package utils
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import (
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"math/rand"
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"testing"
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)
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type testWrsItem struct {
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idx int
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widx *int
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}
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func testWeight(i interface{}) uint64 {
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t := i.(*testWrsItem)
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w := *t.widx
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if w == -1 || w == t.idx {
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return uint64(t.idx + 1)
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}
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return 0
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}
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func TestWeightedRandomSelect(t *testing.T) {
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testFn := func(cnt int) {
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s := NewWeightedRandomSelect(testWeight)
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w := -1
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list := make([]testWrsItem, cnt)
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for i := range list {
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list[i] = testWrsItem{idx: i, widx: &w}
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s.Update(&list[i])
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}
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w = rand.Intn(cnt)
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c := s.Choose()
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if c == nil {
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t.Errorf("expected item, got nil")
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} else {
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if c.(*testWrsItem).idx != w {
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t.Errorf("expected another item")
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}
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}
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w = -2
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if s.Choose() != nil {
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t.Errorf("expected nil, got item")
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}
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}
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testFn(1)
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testFn(10)
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testFn(100)
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testFn(1000)
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testFn(10000)
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testFn(100000)
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testFn(1000000)
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}
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