ceremonyclient/pebble/internal/randvar/skewed_latest_test.go

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2024-01-03 07:31:42 +00:00
// Copyright 2018 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License. See the AUTHORS file
// for names of contributors.
package randvar
import (
"fmt"
"sort"
"testing"
"github.com/stretchr/testify/require"
)
func dumpSamples(x []int) {
sort.Ints(x)
max := x[len(x)-1]
step := max / 20
if step == 0 {
step = 1
}
index := 0
count := 0
for i := 0; i <= max; i += step {
count = 0
for index < len(x) {
if x[index] >= i+step {
break
}
index++
count++
}
fmt.Printf("[%3d-%3d) ", i, i+step)
for j := 0; j < count; j++ {
if j%50 == 0 {
fmt.Printf("%c", '∎')
}
}
fmt.Println()
}
}
func TestSkewedLatest(t *testing.T) {
rng := NewRand()
z, err := NewSkewedLatest(0, 99, 0.99)
require.NoError(t, err)
x := make([]int, 10000)
for i := range x {
x[i] = int(z.Uint64(rng))
}
if testing.Verbose() {
dumpSamples(x)
}
}