From 2a88a4a951f7a0358e5e55aec3f38195d80c866a Mon Sep 17 00:00:00 2001 From: Ada Fernsby 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