reduce logging about db schema initializations during tests

they were a bit too noisy, not helpful

moxvar/reglog.go

@@ -0,0 +1,26 @@
+package moxvar
+
+import (
+	"errors"
+	"io/fs"
+	"log/slog"
+	"os"
+	"testing"
+)
+
+var skipRegisterLogging = testing.Testing()
+
+// RegisterLogger should be used as parameter to bstore.Options.RegisterLogger.
+//
+// RegisterLogger returns nil when running under test and the database file does
+// not yet exist to reduce lots of unhelpful logging, and returns logger log
+// otherwise.
+func RegisterLogger(path string, log *slog.Logger) *slog.Logger {
+	if !skipRegisterLogging {
+		return log
+	}
+	if _, err := os.Stat(path); err != nil && errors.Is(err, fs.ErrNotExist) {
+		return nil
+	}
+	return log
+}