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moby--moby/pkg/stdcopy/stdcopy_test.go

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package stdcopy
import (
"bytes"
"io/ioutil"
"strings"
"testing"
)
func TestNewStdWriter(t *testing.T) {
writer := NewStdWriter(ioutil.Discard, Stdout)
if writer == nil {
t.Fatalf("NewStdWriter with an invalid StdType should not return nil.")
}
}
func TestWriteWithUnitializedStdWriter(t *testing.T) {
writer := StdWriter{
Writer: nil,
prefix: Stdout,
sizeBuf: make([]byte, 4),
}
n, err := writer.Write([]byte("Something here"))
if n != 0 || err == nil {
t.Fatalf("Should fail when given an uncomplete or uninitialized StdWriter")
}
}
func TestWriteWithNilBytes(t *testing.T) {
writer := NewStdWriter(ioutil.Discard, Stdout)
n, err := writer.Write(nil)
if err != nil {
t.Fatalf("Shouldn't have fail when given no data")
}
if n > 0 {
t.Fatalf("Write should have written 0 byte, but has written %d", n)
}
}
func TestWrite(t *testing.T) {
writer := NewStdWriter(ioutil.Discard, Stdout)
data := []byte("Test StdWrite.Write")
n, err := writer.Write(data)
if err != nil {
t.Fatalf("Error while writing with StdWrite")
}
if n != len(data) {
t.Fatalf("Write should have writen %d byte but wrote %d.", len(data), n)
}
}
func TestStdCopyWithInvalidInputHeader(t *testing.T) {
dstOut := NewStdWriter(ioutil.Discard, Stdout)
dstErr := NewStdWriter(ioutil.Discard, Stderr)
src := strings.NewReader("Invalid input")
_, err := StdCopy(dstOut, dstErr, src)
if err == nil {
t.Fatal("StdCopy with invalid input header should fail.")
}
}
func TestStdCopyWithCorruptedPrefix(t *testing.T) {
data := []byte{0x01, 0x02, 0x03}
src := bytes.NewReader(data)
written, err := StdCopy(nil, nil, src)
if err != nil {
t.Fatalf("StdCopy should not return an error with corrupted prefix.")
}
if written != 0 {
t.Fatalf("StdCopy should have written 0, but has written %d", written)
}
}
func BenchmarkWrite(b *testing.B) {
w := NewStdWriter(ioutil.Discard, Stdout)
data := []byte("Test line for testing stdwriter performance\n")
data = bytes.Repeat(data, 100)
b.SetBytes(int64(len(data)))
b.ResetTimer()
for i := 0; i < b.N; i++ {
if _, err := w.Write(data); err != nil {
b.Fatal(err)
}
}
}