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// Copyright 2014 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build unix
package rand
import (
"bytes"
"errors"
prand "math/rand"
"testing"
)
func TestBatched(t *testing.T) {
fillBatched := batched(func(p []byte) error {
for i := range p {
p[i] = byte(i)
}
return nil
}, 5)
p := make([]byte, 13)
if err := fillBatched(p); err != nil {
t.Fatalf("batched function returned error: %s", err)
}
expected := []byte{0, 1, 2, 3, 4, 0, 1, 2, 3, 4, 0, 1, 2}
if !bytes.Equal(expected, p) {
t.Errorf("incorrect batch result: got %x, want %x", p, expected)
}
}
func TestBatchedBuffering(t *testing.T) {
backingStore := make([]byte, 1<<23)
prand.Read(backingStore)
backingMarker := backingStore[:]
output := make([]byte, len(backingStore))
outputMarker := output[:]
fillBatched := batched(func(p []byte) error {
n := copy(p, backingMarker)
backingMarker = backingMarker[n:]
return nil
}, 731)
for len(outputMarker) > 0 {
max := 9200
if max > len(outputMarker) {
max = len(outputMarker)
}
howMuch := prand.Intn(max + 1)
if err := fillBatched(outputMarker[:howMuch]); err != nil {
t.Fatalf("batched function returned error: %s", err)
}
outputMarker = outputMarker[howMuch:]
}
if !bytes.Equal(backingStore, output) {
t.Error("incorrect batch result")
}
}
func TestBatchedError(t *testing.T) {
b := batched(func(p []byte) error { return errors.New("failure") }, 5)
if b(make([]byte, 13)) == nil {
t.Fatal("batched function should have returned an error")
}
}
func TestBatchedEmpty(t *testing.T) {
b := batched(func(p []byte) error { return errors.New("failure") }, 5)
if b(make([]byte, 0)) != nil {
t.Fatal("empty slice should always return successful")
}
}
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