add more cover stuff

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

errors/errors_test.go

@@ -97,7 +97,6 @@ func TestErrors(t *testing.T) {
 	}
 }
 
-
 func TestCodeIn(t *testing.T) {
 	err := InternalServerError("id", "%s", "msg")
 
@@ -112,4 +111,4 @@ func TestCodeIn(t *testing.T) {
 	if ok := CodeIn(err, 100); ok {
 		t.Fatalf("CodeIn not works: %v", err)
 	}
-}
+}