/
file_test.go
98 lines (87 loc) · 1.79 KB
/
file_test.go
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package main
import (
"bufio"
"bytes"
"io"
"os"
"strings"
"testing"
)
func IsExistFile(filepath string) bool {
_, err := os.Stat(filepath)
if err == nil {
return true
}
return !os.IsNotExist(err)
}
var VowelMapping = map[string]string{}
func TestRead(t *testing.T) {
file, err := os.Open("./count.txt")
if err != nil {
t.Error(err)
}
defer file.Close()
line := bufio.NewReader(file)
for {
line, _, err := line.ReadLine()
if err == io.EOF || len(line) == 0 {
break
}
strSli := strings.Split(string(line), "##")
if len(strSli) == 2 {
VowelMapping[strSli[0]] = strSli[1]
}
}
t.Logf("VowelMapping len=%d", len(VowelMapping))
t.Log(VowelMapping["<p:uang4>"])
}
func TestStatsCount(t *testing.T) {
file, _ := os.Open("./count.txt")
count, _ := StatsCount(file)
t.Log(count)
}
// statistics file line num
func StatsCount(r io.Reader) (c int, err error) {
// 32K cache
buf := make([]byte, 32*1024)
count := 1
lineSep := []byte{'\n'}
for {
c, err := r.Read(buf)
count += bytes.Count(buf[:c], lineSep)
switch {
case err == io.EOF:
return count, nil
case err != nil:
return count, err
}
}
}
// 根据字节数读取file
// 1.16有更好的方式,查看embed_test.go
func TestReadFile(t *testing.T) {
buf := make([]byte, 10)
file, _ := os.Open("./embed.txt")
n, err := io.ReadFull(file, buf)
if err != nil {
t.Log(n, err.Error())
} else {
t.Log(string(buf))
}
}
//////////////////// Write data to file.
func TestDataWriter(t *testing.T) {
file, err := os.OpenFile("./tmp/writer.txt", os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
t.Error(err)
return
}
writer := bufio.NewWriter(file)
defer func() {
_ = writer.Flush()
_ = file.Close()
}()
_, _ = writer.WriteString("a\n")
_, _ = writer.WriteString("b\n")
}
////////////////////