优化订单结算金额展示和钱包流水号

backend/internal/modules/wallet/repository_test.go

@@ -1,6 +1,7 @@
 package wallet
 
 import (
+	"regexp"
 	"testing"
 
 	"hfb_sys/backend/internal/model"
@@ -29,3 +30,14 @@ func TestApplyEntryRoundsMoneyBeforeComparing(t *testing.T) {
 		t.Fatalf("FrozenBalance = %v, want 0", account.FrozenBalance)
 	}
 }
+
+func TestNewLedgerNoUsesReadableFormat(t *testing.T) {
+	ledgerNo, err := newLedgerNo()
+	if err != nil {
+		t.Fatalf("newLedgerNo() error = %v", err)
+	}
+	matched := regexp.MustCompile(`^WL\d{21}$`).MatchString(ledgerNo)
+	if !matched {
+		t.Fatalf("ledgerNo = %q, want WL + 21 digits", ledgerNo)
+	}
+}