Add mock OS.

1 files changed, 21 insertions, 1 deletions

diff --git a/os.go b/os.go
index 266091b..f1de723 100644
--- a/os.go
+++ b/os.go
@@ -1,5 +1,25 @@
 package bolt
 
 import (
-	_ "os"
+	"os"
 )
+
+type OS interface {
+	OpenFile(name string, flag int, perm os.FileMode) (file *os.File, err error)
+	Stat(name string) (fi os.FileInfo, err error)
+	Getpagesize() int
+}
+
+type sysos struct{}
+
+func (o *sysos) OpenFile(name string, flag int, perm os.FileMode) (file *os.File, err error) {
+	return os.OpenFile(name, flag, perm)
+}
+
+func (o *sysos) Stat(name string) (fi os.FileInfo, err error) {
+	return os.Stat(name)
+}
+
+func (o *sysos) Getpagesize() int {
+	return os.Getpagesize()
+}