/usr/share/gocode/src/github.com/philhofer/fwd/writer_test.go is in golang-github-philhofer-fwd-dev 0.0~git20151005.0.8fd9a4b-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import (
"bytes"
"io"
"math/rand"
"testing"
)
type chunkedWriter struct {
w *Writer
}
// writes 'p' in randomly-sized chunks
func (c chunkedWriter) Write(p []byte) (int, error) {
l := len(p)
n := 0
for n < l {
amt := max(rand.Intn(l-n), 1) // number of bytes to write; at least 1
nn, err := c.w.Write(p[n : n+amt]) //
n += nn
if err == nil && nn < amt {
err = io.ErrShortWrite
}
if err != nil {
return n, err
}
}
return n, nil
}
// analagous to Write(), but w/ str
func (c chunkedWriter) WriteString(s string) (int, error) {
l := len(s)
n := 0
for n < l {
amt := max(rand.Intn(l-n), 1) // number of bytes to write; at least 1
nn, err := c.w.WriteString(s[n : n+amt]) //
n += nn
if err == nil && nn < amt {
err = io.ErrShortWrite
}
if err != nil {
return n, err
}
}
return n, nil
}
// writes via random calls to Next()
type nextWriter struct {
wr *Writer
}
func (c nextWriter) Write(p []byte) (int, error) {
l := len(p)
n := 0
for n < l {
amt := max(rand.Intn(l-n), 1) // at least 1 byte
fwd, err := c.wr.Next(amt) // get next (amt) bytes
if err != nil {
// this may happen occasionally
if err == io.ErrShortBuffer {
if cap(c.wr.buf) >= amt {
panic("bad io.ErrShortBuffer")
}
continue
}
return n, err
}
if len(fwd) != amt {
panic("bad Next() len")
}
n += copy(fwd, p[n:])
}
return n, nil
}
func TestWrite(t *testing.T) {
nbts := 4096
bts := randomBts(nbts)
var buf bytes.Buffer
wr := NewWriterSize(&buf, 512)
if wr.BufferSize() != 512 {
t.Fatalf("expected BufferSize() to be %d; found %d", 512, wr.BufferSize())
}
cwr := chunkedWriter{wr}
nb, err := cwr.Write(bts)
if err != nil {
t.Fatal(err)
}
if nb != nbts {
t.Fatalf("expected to write %d bytes; wrote %d bytes", nbts, nb)
}
err = wr.Flush()
if err != nil {
t.Fatal(err)
}
if wr.Buffered() != 0 {
t.Fatalf("expected 0 buffered bytes; found %d", wr.Buffered())
}
if buf.Len() != nbts {
t.Fatalf("wrote %d bytes, but buffer is %d bytes long", nbts, buf.Len())
}
if !bytes.Equal(bts, buf.Bytes()) {
t.Fatal("buf.Bytes() is not the same as the input bytes")
}
}
func TestWriteString(t *testing.T) {
nbts := 3998
str := string(randomBts(nbts))
var buf bytes.Buffer
wr := NewWriterSize(&buf, 1137)
if wr.BufferSize() != 1137 {
t.Fatalf("expected BufferSize() to return %d; returned %d", 1137, wr.BufferSize())
}
cwr := chunkedWriter{wr}
nb, err := cwr.WriteString(str)
if err != nil {
t.Fatal(err)
}
if nb != nbts {
t.Fatalf("expected to write %d bytes; wrote %d bytes", nbts, nb)
}
err = wr.Flush()
if err != nil {
t.Fatal(err)
}
if wr.Buffered() != 0 {
t.Fatalf("expected 0 buffered bytes; found %d", wr.Buffered())
}
if buf.Len() != nbts {
t.Fatalf("wrote %d bytes, buf buffer is %d bytes long", nbts, buf.Len())
}
if buf.String() != str {
t.Fatal("buf.String() is not the same as input string")
}
}
func TestWriteByte(t *testing.T) {
nbts := 3200
bts := randomBts(nbts)
var buf bytes.Buffer
wr := NewWriter(&buf)
if wr.BufferSize() != DefaultWriterSize {
t.Fatalf("expected BufferSize() to return %d; returned %d", DefaultWriterSize, wr.BufferSize())
}
// write byte-by-byte
for _, b := range bts {
if err := wr.WriteByte(b); err != nil {
t.Fatal(err)
}
}
err := wr.Flush()
if err != nil {
t.Fatal(err)
}
if buf.Len() != nbts {
t.Fatalf("expected buf.Len() to be %d; got %d", nbts, buf.Len())
}
if !bytes.Equal(buf.Bytes(), bts) {
t.Fatal("buf.Bytes() and input are not equal")
}
}
func TestWriterNext(t *testing.T) {
nbts := 1871
bts := randomBts(nbts)
var buf bytes.Buffer
wr := NewWriterSize(&buf, 500)
nwr := nextWriter{wr}
nb, err := nwr.Write(bts)
if err != nil {
t.Fatal(err)
}
if nb != nbts {
t.Fatalf("expected to write %d bytes; wrote %d", nbts, nb)
}
err = wr.Flush()
if err != nil {
t.Fatal(err)
}
if buf.Len() != nbts {
t.Fatalf("expected buf.Len() to be %d; got %d", nbts, buf.Len())
}
if !bytes.Equal(buf.Bytes(), bts) {
t.Fatal("buf.Bytes() and input are not equal")
}
}
func TestReadFrom(t *testing.T) {
nbts := 2139
bts := randomBts(nbts)
var buf bytes.Buffer
wr := NewWriterSize(&buf, 987)
rd := partialReader{bytes.NewReader(bts)}
nb, err := wr.ReadFrom(rd)
if err != nil {
t.Fatal(err)
}
if nb != int64(nbts) {
t.Fatalf("expeted to write %d bytes; wrote %d", nbts, nb)
}
err = wr.Flush()
if err != nil {
t.Fatal(err)
}
if buf.Len() != nbts {
t.Fatalf("expected buf.Len() to be %d; got %d", nbts, buf.Len())
}
if !bytes.Equal(buf.Bytes(), bts) {
t.Fatal("buf.Bytes() and input are not equal")
}
}
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