Use subtests for rename tests

unionfs/unionfs_test.go

@@ -522,8 +522,10 @@ func TestUnionFsRename(t *testing.T) {
 	}
 
 	for i, c := range configs {
-		t.Log("Config", i, c)
+		t.Run(fmt.Sprintf("config %d", i), func(t *testing.T) {
 			wd, clean := setupUfs(t)
+			defer clean()
+
 			if c.f1_ro {
 				WriteFile(t, wd+"/ro/file1", "c1")
 			}
@@ -563,7 +565,7 @@ func TestUnionFsRename(t *testing.T) {
 			if err != nil {
 				t.Errorf("Should have gotten file1: %v", err)
 			}
-		clean()
+		})
 	}
 }