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package common
import (
"bytes"
"io/ioutil"
"math/rand"
"os"
"testing"
"time"
)
func TestWriteFileAtomic(t *testing.T) {
var (
seed = rand.New(rand.NewSource(time.Now().UnixNano()))
data = []byte(RandStr(seed.Intn(2048)))
old = RandBytes(seed.Intn(2048))
perm os.FileMode = 0600
)
f, err := ioutil.TempFile("/tmp", "write-atomic-test-")
if err != nil {
t.Fatal(err)
}
defer os.Remove(f.Name())
if err = ioutil.WriteFile(f.Name(), old, 0664); err != nil {
t.Fatal(err)
}
if err = WriteFileAtomic(f.Name(), data, perm); err != nil {
t.Fatal(err)
}
rData, err := ioutil.ReadFile(f.Name())
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(data, rData) {
t.Fatalf("data mismatch: %v != %v", data, rData)
}
stat, err := os.Stat(f.Name())
if err != nil {
t.Fatal(err)
}
if have, want := stat.Mode().Perm(), perm; have != want {
t.Errorf("have %v, want %v", have, want)
}
}
func TestGoPath(t *testing.T) {
// restore original gopath upon exit
path := os.Getenv("GOPATH")
defer func() {
_ = os.Setenv("GOPATH", path)
}()
err := os.Setenv("GOPATH", "~/testgopath")
if err != nil {
t.Fatal(err)
}
path = GoPath()
if path != "~/testgopath" {
t.Fatalf("should get GOPATH env var value, got %v", path)
}
os.Unsetenv("GOPATH")
path = GoPath()
if path != "~/testgopath" {
t.Fatalf("subsequent calls should return the same value, got %v", path)
}
}
func TestGoPathWithoutEnvVar(t *testing.T) {
// restore original gopath upon exit
path := os.Getenv("GOPATH")
defer func() {
_ = os.Setenv("GOPATH", path)
}()
os.Unsetenv("GOPATH")
// reset cache
gopath = ""
path = GoPath()
if path == "" || path == "~/testgopath" {
t.Fatalf("should get nonempty result of calling go env GOPATH, got %v", path)
}
}