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frame_test.go
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frame_test.go
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package wal
import (
"bytes"
"io"
"testing"
)
func Test_SerDe(t *testing.T) {
t.Run("write and read 3 frames successfully", func(t *testing.T) {
wantString := "hello world!"
wantData := []byte(wantString)
totalFrames := 3
var rwBuffer bytes.Buffer
f := newFramer(&rwBuffer)
for i := 1; i <= totalFrames; i++ {
if _, err := f.frame(wantData); err != nil {
t.Fatal(err)
}
}
d := newDeframer(&rwBuffer)
nFrames := 0
for {
gotData, _, err := d.deframe()
if err == nil {
nFrames++
gotString := string(gotData)
if gotString != wantString {
t.Fatalf("on frame #%d, got %#v, but wanted %#v", nFrames, gotString, wantString)
}
} else if err == io.EOF {
break
} else {
t.Fatal(err)
}
}
if nFrames != totalFrames {
t.Fatalf("wrote %d frames, but only deframed %d", totalFrames, nFrames)
}
})
t.Run("torn write causes errorPartialFrame", func(t *testing.T) {
frame, err := getFrameData([]byte("Hello world!"))
if err != nil {
t.Fatal(err)
}
// purposefully write a partial frame (torn write)
for i := 1; i < len(frame); i++ {
d := newDeframer(bytes.NewBuffer(frame[:i]))
got, _, err := d.deframe()
if err == nil {
t.Fatalf("tore off %d bytes from end; not supposed to successfully read a frame; got: %#v", len(frame)-i, string(got))
}
if _, ok := err.(errorPartialFrame); !ok {
t.Fatalf("tore off %d bytes from end; did not get errorPartialFrame; instead, got %v", len(frame)-i, err)
}
}
})
t.Run("flip checksum bit fails checksum", func(t *testing.T) {
frame, err := getFrameData([]byte("Hello world!"))
if err != nil {
t.Fatal(err)
}
// flip the 7th bit of the 3rd checksum byte
frame[8+3] = frame[8+3] ^ (1 << 6)
d := newDeframer(bytes.NewBuffer(frame))
_, _, err = d.deframe()
if _, ok := err.(errorChecksum); !ok {
t.Fatalf("supposed to get errorChecksum, not %v", err)
}
})
t.Run("flip data bit fails checksum", func(t *testing.T) {
frame, err := getFrameData([]byte("Hello world!"))
if err != nil {
t.Fatal(err)
}
// flip the 5th bit of the 11th data byte
frame[11+5] = frame[11+5] ^ (1 << 4)
d := newDeframer(bytes.NewBuffer(frame))
_, _, err = d.deframe()
if _, ok := err.(errorChecksum); !ok {
t.Fatalf("supposed to get errorChecksum, not %v", err)
}
})
}
func getFrameData(data []byte) ([]byte, error) {
var rwBuffer bytes.Buffer
f := newFramer(&rwBuffer)
if _, err := f.frame(data); err != nil {
return nil, err
}
return []byte(rwBuffer.String()), nil
}