Use local instance of minio server.

Need to figure out how to have tests automatically start and kill
server.

backend/s3_test.go

@@ -1,17 +1,34 @@
 package backend_test
 
 import (
+	"os"
 	"testing"
 
+	"github.com/minio/minio-go"
 	bes3 "github.com/restic/restic/backend/s3"
+	. "github.com/restic/restic/test"
 )
 
 func TestS3Backend(t *testing.T) {
-	s, err := bes3.Open("play.minio.io:9000", "restictestbucket")
-
+	config := minio.Config{
+		AccessKeyID:     os.Getenv("AWS_ACCESS_KEY_ID"),
+		SecretAccessKey: os.Getenv("AWS_SECRET_ACCESS_KEY"),
+		Endpoint:        "http://localhost:9000",
+	}
+	s3Client, err := minio.New(config)
 	if err != nil {
 		t.Fatal(err)
 	}
 
+	bucketname := "restictestbucket"
+
+	err = s3Client.MakeBucket(bucketname, "")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	s, err := bes3.Open("127.0.0.1:9000", bucketname)
+	OK(t, err)
+
 	testBackend(s, t)
 }