From cfb88da1b2df3db85c3780738191d52658fe5c02 Mon Sep 17 00:00:00 2001
From: Neil <4138956+nwparker@users.noreply.github.com>
Date: Tue, 11 Aug 2026 00:05:03 -0700
Subject: [PATCH] test(git): pin show --end-of-options blob reads in the compat
 matrix
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The pinned SSH branch diff makes `show --end-of-options <oid>:<path>` the
only Git command on that path, and depends on it resolving against the
named commit rather than live HEAD, and on failing for a path absent at
that commit — that failure is what renders additions and deletions.

Co-authored-by: Orca <help@stably.ai>
---
 src/shared/git-binary-compatibility.test.ts | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/src/shared/git-binary-compatibility.test.ts b/src/shared/git-binary-compatibility.test.ts
index 660a2b7aaad..c8fe65d53bb 100644
--- a/src/shared/git-binary-compatibility.test.ts
+++ b/src/shared/git-binary-compatibility.test.ts
@@ -226,4 +226,25 @@ describeBinaryCompatibility('real Git binary compatibility', () => {
     expect(lines[0]).toBe('--end-of-options')
     expect(lines.find((line) => line !== '--end-of-options')).toMatch(/^refs\//)
   })
+
+  // Why pin this: `show --end-of-options <oid>:<path>` is the only Git command on the
+  // pinned SSH branch-diff path, and both blob sides depend on it resolving against the
+  // named commit rather than live HEAD, and on failing (not falling back) for a path
+  // absent at that commit — that failure is what renders additions and deletions.
+  it('reads a blob at a pinned object id', async () => {
+    await writeFile(join(repoPath, 'pinned.txt'), 'pinned\n')
+    await runGit(['add', 'pinned.txt'])
+    await runGit(['commit', '-qm', 'pinned'])
+    const pinnedOid = (await runGit(['rev-parse', 'HEAD'])).stdout.trim()
+
+    await writeFile(join(repoPath, 'pinned.txt'), 'moved on\n')
+    await runGit(['commit', '-qam', 'after pinned'])
+
+    await expect(
+      runGit(['show', '--end-of-options', `${pinnedOid}:pinned.txt`])
+    ).resolves.toMatchObject({ stdout: 'pinned\n' })
+    await expect(
+      runGit(['show', '--end-of-options', `${pinnedOid}:absent.txt`])
+    ).rejects.toBeDefined()
+  })
 })