Fix object/commitgraph tests

Signed-off-by: Filip Navara <[email protected]>

plumbing/object/commitgraph/commitnode_test.go

@@ -2,6 +2,7 @@ package commitgraph
 
 import (
 	"path"
+	"testing"
 
 	. "gopkg.in/check.v1"
 	fixtures "gopkg.in/src-d/go-git-fixtures.v3"
@@ -12,6 +13,8 @@ import (
 	"gopkg.in/src-d/go-git.v4/storage/filesystem"
 )
 
+func Test(t *testing.T) { TestingT(t) }
+
 type CommitNodeSuite struct {
 	fixtures.Suite
 }