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moby--moby/pkg/ioutils/readers_test.go
unclejack 028f7987fe pkg/ioutils: add tests for BufReader
Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com>
2015-03-18 19:32:46 +02:00

92 lines
1.9 KiB
Go

package ioutils
import (
"bytes"
"io"
"io/ioutil"
"testing"
)
func TestBufReader(t *testing.T) {
reader, writer := io.Pipe()
bufreader := NewBufReader(reader)
// Write everything down to a Pipe
// Usually, a pipe should block but because of the buffered reader,
// the writes will go through
done := make(chan bool)
go func() {
writer.Write([]byte("hello world"))
writer.Close()
done <- true
}()
// Drain the reader *after* everything has been written, just to verify
// it is indeed buffering
<-done
output, err := ioutil.ReadAll(bufreader)
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(output, []byte("hello world")) {
t.Error(string(output))
}
}
type repeatedReader struct {
readCount int
maxReads int
data []byte
}
func newRepeatedReader(max int, data []byte) *repeatedReader {
return &repeatedReader{0, max, data}
}
func (r *repeatedReader) Read(p []byte) (int, error) {
if r.readCount >= r.maxReads {
return 0, io.EOF
}
r.readCount++
n := copy(p, r.data)
return n, nil
}
func testWithData(data []byte, reads int) {
reader := newRepeatedReader(reads, data)
bufReader := NewBufReader(reader)
io.Copy(ioutil.Discard, bufReader)
}
func Benchmark1M10BytesReads(b *testing.B) {
reads := 1000000
readSize := int64(10)
data := make([]byte, readSize)
b.SetBytes(readSize * int64(reads))
b.ResetTimer()
for i := 0; i < b.N; i++ {
testWithData(data, reads)
}
}
func Benchmark1M1024BytesReads(b *testing.B) {
reads := 1000000
readSize := int64(1024)
data := make([]byte, readSize)
b.SetBytes(readSize * int64(reads))
b.ResetTimer()
for i := 0; i < b.N; i++ {
testWithData(data, reads)
}
}
func Benchmark10k32KBytesReads(b *testing.B) {
reads := 10000
readSize := int64(32 * 1024)
data := make([]byte, readSize)
b.SetBytes(readSize * int64(reads))
b.ResetTimer()
for i := 0; i < b.N; i++ {
testWithData(data, reads)
}
}