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package buffer
import (
"bytes"
"reflect"
"testing"
)
func incBuf(start, size int) []byte {
b := make([]byte, size)
for i := 0; i < size; i++ {
b[i] = byte((start + i) % 16)
}
return b
}
func testBuffer() *Circular {
c := NewCircular(15)
c.buf = incBuf(0, 16)
return c
}
func TestEmptyRead(t *testing.T) {
t.Parallel()
var p [1]byte
c := NewCircular(16)
n, err := c.Read(p[:])
if err != nil {
t.Fatalf("Error on read operation: %v")
}
if n != 0 {
t.Errorf("Read %d bytes, expected 0", n)
}
}
// Test Read: [H+++T---]
func TestStartRead(t *testing.T) {
t.Parallel()
c := testBuffer()
readSize := 8
p := make([]byte, readSize+1)
c.tail = readSize
n, err := c.Read(p)
if err != nil {
t.Fatalf("Error while reading: %v", err)
}
if n != readSize {
t.Fatalf("Read expected %d bytes, got %d", readSize, n)
}
expected := incBuf(0, 8)
got := p[:readSize]
if !reflect.DeepEqual(expected, got) {
t.Errorf("Wrong buffer values read. Expected %v, got %v", expected, got)
}
}
func TestMiddleRead(t *testing.T) {
t.Parallel()
c := testBuffer()
readSize := 8
p := make([]byte, readSize+1)
c.head = 4
c.tail = 12
n, err := c.Read(p)
if err != nil {
t.Fatalf("Error while reading: %v", err)
}
if n != readSize {
t.Fatalf("Read expected %d bytes, got %d", readSize)
}
expected := incBuf(4, 8)
got := p[:readSize]
if !reflect.DeepEqual(expected, got) {
t.Errorf("Wrong buffer values read. Expected %v, got %v", expected, got)
}
}
func TestTwoReads(t *testing.T) {
t.Parallel()
c := testBuffer()
readSize := 4
p := make([]byte, readSize)
c.head = 4
c.tail = 12
for i := 0; i < 2; i++ {
n, err := c.Read(p)
if err != nil {
t.Fatalf("Error while reading: %v", err)
}
if n != readSize {
t.Fatalf("Wrong read size. Expected %d, got %d", readSize, n)
}
expected := incBuf(4+(4*i), 4)
if !reflect.DeepEqual(p, expected) {
t.Fatalf("Wrong buffer values for read #%d. Expected %v, got %v", i+1, expected, p)
}
}
}
func TestReadTailZero(t *testing.T) {
t.Parallel()
c := testBuffer()
readSize := 4
p := make([]byte, readSize*2)
c.head = 12
c.tail = 0
n, err := c.Read(p)
if err != nil {
t.Fatalf("Error while reading: %v", err)
}
if n != readSize {
t.Fatalf("Wrong read size. Expected %d, got %d", readSize, n)
}
expected := incBuf(12, 4)
got := p[:readSize]
if !reflect.DeepEqual(got, expected) {
t.Fatalf("Wrong buffer values for read. Expected %v, got %v", expected, got)
}
}
func TestReadWrap(t *testing.T) {
t.Parallel()
c := testBuffer()
readSize := 14
p := make([]byte, readSize*2)
c.head = 12
c.tail = 10
n, err := c.Read(p)
if err != nil {
t.Fatalf("Error while reading: %v", err)
}
if n != readSize {
t.Fatalf("Wrong read size. Expected %d, got %d", readSize, n)
}
expected := incBuf(12, readSize)
got := p[:readSize]
if !reflect.DeepEqual(got, expected) {
t.Fatalf("Wrong buffer values for read. Expected %v, got %v", expected, got)
}
}
func TestEmptyReadAfterExhaustion(t *testing.T) {
t.Parallel()
c := testBuffer()
readSize := 14
p := make([]byte, readSize*2)
c.head = 12
c.tail = 10
n, err := c.Read(p)
if err != nil {
t.Fatalf("Error while reading: %v", err)
}
if n != readSize {
t.Fatalf("Wrong read size. Expected %d, got %d", readSize, n)
}
expected := incBuf(12, readSize)
got := p[:readSize]
if !reflect.DeepEqual(got, expected) {
t.Fatalf("Wrong buffer values for read. Expected %v, got %v", expected, p)
}
n, err = c.Read(p)
if err != nil {
t.Fatalf("Error while reading: %v", err)
}
if n != 0 {
t.Fatalf("Wrong read size. Expected 0, got %d", n)
}
}
func TestWriteTooBig(t *testing.T) {
t.Parallel()
size := 16
p := bytes.NewBuffer(make([]byte, size+1))
c := NewCircular(size)
_, err := c.ReadFrom(p)
if err != FullError {
t.Errorf("Expected FULL error but got %v", err)
}
}
func TestWriteReadFullFromZero(t *testing.T) {
toWrite := incBuf(0, 16)
c := NewCircular(16)
n, err := c.ReadFrom(bytes.NewBuffer(toWrite))
if err != nil {
t.Fatalf("Error while writing: %v", err)
}
if n != 16 {
t.Fatalf("Wrong number of bytes written. Expceted 16, got %d", n)
}
p := make([]byte, 16)
n, err = c.Read(p)
if err != nil {
t.Fatalf("Error while reading: %v", err)
}
if n != 16 {
t.Fatalf("")
}
}
|
