Git Patch - Intentionally Invalid Hunk Line Counts

From 2a88a4a951f7a0358e5e55aec3f38195d80c866a Mon Sep 17 00:00:00 2001
From: Ada Fernsby <ada.fernsby@example.invalid>
Date: Fri, 13 Mar 2026 09:00:00 +0000
Subject: [PATCH] fix(ledger): guard the zero delta

Base message for the intentionally invalid fixtures.
---
 internal/ledger/apply.go | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/internal/ledger/apply.go b/internal/ledger/apply.go
index 95f499d..ce501c6 100644
--- a/internal/ledger/apply.go
+++ b/internal/ledger/apply.go
@@ -1,99 +1,99 @@
 package ledger
 
-import "errors"
+import (
+	"errors"
+	"fmt"
+)
 
 // ErrShortBalance is returned when a posting would drive the balance negative.
 var ErrShortBalance = errors.New("ledger: insufficient balance")
 
 // Apply posts one delta against the running balance and returns the new total.
+// A zero delta is a no-op and never reports an error.
 func Apply(balance, delta int64) (int64, error) {
+	if delta == 0 {
+		return balance, nil
+	}
 	if balance+delta < 0 {
-		return balance, ErrShortBalance
+		return balance, fmt.Errorf("%w: balance %d, requested %d", ErrShortBalance, balance, delta)
 	}
 	return balance + delta, nil
 }
-- 
2.43.0