Git Patch - Copy Detection at similarity index 85%
`copy from`/`copy to` headers, produced only when copy detection is enabled with `-C`. The source file still exists afterwards, which is the whole difference from a rename, and the difference a parser that maps both header pairs onto one 'moved' concept silently erases.
From d3ce9f55473492d67f074bd28926052ed2f27811 Mon Sep 17 00:00:00 2001
From: Ada Fernsby <ada.fernsby@example.invalid>
Date: Fri, 6 Mar 2026 10:44:05 +0000
Subject: [PATCH] ledger: add a strict variant of Apply
Generated with format-patch -C so the shared history is visible in review.
---
internal/ledger/{apply.go => apply_strict.go} | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
copy internal/ledger/{apply.go => apply_strict.go} (85%)
diff --git a/internal/ledger/apply.go b/internal/ledger/apply_strict.go
similarity index 85%
copy from internal/ledger/apply.go
copy to internal/ledger/apply_strict.go
index 95f499d..3211ad6 100644
--- a/internal/ledger/apply.go
+++ b/internal/ledger/apply_strict.go
@@ -5,8 +5,8 @@
// 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.
-func Apply(balance, delta int64) (int64, error) {
+// ApplyStrict posts one delta against the running balance and returns the new total.
+func ApplyStrict(balance, delta int64) (int64, error) {
if balance+delta < 0 {
return balance, ErrShortBalance
}
--
2.43.0
Specifications
- Seed
- 20260807
- Extended Header
- similarity index / copy from / copy to
- Files
- 1
- Similarity Index
- 85
- Produced With
- git format-patch -C
- Line Endings
- LF
- Encoding
- UTF-8
Testing contract
Expected to pass- Scenario
- Apply a patch containing copy from / copy to headers and check the source file afterwards.
- Expected result
- internal/ledger/apply_strict.go is created AND internal/ledger/apply.go still exists unchanged.
What is a .patch file?
A .patch file is a unified diff packaged for transmission, most often as produced by `git format-patch`. Beyond the diff itself it carries an email-style header with the author, date, and commit subject, a commit message body, per-file `diff --git` headers recording renames and mode changes, and hunk headers of the form `@@ -old,count +new,count @@`. Applying it reconstructs a specific change against a specific before-state.
How to use this file
Use an example .patch file to test patch application, code-review renderers, and diff parsers: exercising renames, mode changes, binary hunks, added and deleted files, and the `\ No newline at end of file` marker that naive parsers silently drop.
How to use this file for testing
“Git Patch - Copy Detection at similarity index 85%” is a deterministic Testaroo fixture for Visual diff / regression, Code parsing, Editor testing. A/B image twins with controlled pixel changes, anti-alias variants, and UI chrome crops for screenshot diff and visual regression tools.
Documented properties for this file: seed 20260807 · UTF-8 · LF. Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.
Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such, expect parsers to fail loudly rather than silently accept them.
Diff and patch fixtures name their target paths and the exact edge case they exercise, rename, mode change, binary hunk, CRLF↔LF, or missing trailing newline. Apply or render them against the documented before-state; every author, path, and hash is fictional.
Treat A/B twins as a visual regression unit: run your pixel or perceptual diff, assert a non-zero delta on the changed twin, and keep thresholds calibrated against the documented change kind in specs.
Generated by generation/version_control.py. Free for any use, no attribution required, license.
Related files
- patchGit Format-Patch Series - 0000 Cover LetterThe `--cover-letter` message git writes ahead of a series: a `[PATCH 0/3]` subject, a shortlog of the authors and their subjects, and the combined diffstat, but no diff of its own. Series tooling has to recognise it as metadata and not try to apply it.
- patchGit Format-Patch Series - 0001 of 3Patch 1 of a three-message series, threaded under the cover letter with In-Reply-To and References headers. Applying the three out of order breaks: the series is only self-consistent in numeric order.
- patchGit Format-Patch Series - 0002 of 3Patch 2 of a three-message series, threaded under the cover letter with In-Reply-To and References headers. Applying the three out of order breaks: the series is only self-consistent in numeric order.
- patchGit Format-Patch Series - 0003 of 3Patch 3 of a three-message series, threaded under the cover letter with In-Reply-To and References headers. Applying the three out of order breaks: the series is only self-consistent in numeric order.
- patchGit Patch - deleted file mode HeaderA deletion of an executable file, so the `deleted file mode 100755` header records the mode the file had rather than the mode to create. A patcher that writes an empty file here instead of unlinking leaves a broken executable behind.
- patchGit Patch - Every Extended Header in One CommitThe torture test: one commit that creates a file, deletes an executable, renames at 100%, copies with detection on, changes a mode while editing, and adds a binary blob. The diffstat carries the matching create/delete/rename/mode-change summary lines that follow the file table.
