fix formatting

Author: idoqo

exporter/exporter_test.go

@@ -27,10 +27,11 @@ import (
 	"sync"
 	"testing"
 
-	"github.com/percona/mongodb_exporter/internal/tu"
 	"github.com/prometheus/client_golang/prometheus/testutil"
 	"github.com/prometheus/common/promslog"
 	"github.com/stretchr/testify/assert"
+
+	"github.com/percona/mongodb_exporter/internal/tu"
 )
 
 // Use this for testing because labels like cluster ID are not constant in docker containers