Create 'datadir' package responsible for paths.

server/datadir/datadir_test.go

@@ -0,0 +1,33 @@
+package datadir_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"go.etcd.io/etcd/server/v3/datadir"
+)
+
+func TestToBackendFileName(t *testing.T) {
+	result := datadir.ToBackendFileName("/dir/data-dir")
+	assert.Equal(t, "/dir/data-dir/member/snap/db", result)
+}
+
+func TestToMemberDir(t *testing.T) {
+	result := datadir.ToMemberDir("/dir/data-dir")
+	assert.Equal(t, "/dir/data-dir/member", result)
+}
+
+func TestToSnapDir(t *testing.T) {
+	result := datadir.ToSnapDir("/dir/data-dir")
+	assert.Equal(t, "/dir/data-dir/member/snap", result)
+}
+
+func TestToWalDir(t *testing.T) {
+	result := datadir.ToWalDir("/dir/data-dir")
+	assert.Equal(t, "/dir/data-dir/member/wal", result)
+}
+
+func TestToWalDirSlash(t *testing.T) {
+	result := datadir.ToWalDir("/dir/data-dir/")
+	assert.Equal(t, "/dir/data-dir/member/wal", result)
+}