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test: pin git init to 'main' in test setup (fix Linux-CI branch-group failures)

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Git defaults the initial branch to 'master' unless init.defaultBranch is set —
true on Linux CI runners but typically overridden to 'main' on developer macOS
machines. That host gap made git-worktree tests assuming 'main' (the
shared-branch-group reliability suite in engine shard 2/2) pass locally but
fail only in CI with 'fatal: path ... does not exist in main'.

Set init.defaultBranch=main for every test process via GIT_CONFIG_* env vars in
the shared core test setup (inherited by all child git invocations, without
mutating the developer's global config). Appends rather than clobbers any
pre-existing GIT_CONFIG_COUNT.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
gsxdsm
2026-06-03 19:07:20 -07:00
parent 8e9a3ac4ce
commit 3432e0615c
1 changed files with 14 additions and 0 deletions
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14
packages/core/src/__test-utils__/vitest-setup.ts
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@@ -69,6 +69,20 @@ const BLOCKED_TEST_CLI_PATTERN =
const originalCwd = process.cwd.bind(process);
// Pin `git init` to the `main` branch for every test process. Git defaults the
// initial branch to `master` unless `init.defaultBranch` is set — true on Linux
// CI runners but usually overridden to `main` on developer macOS machines. That
// host gap silently broke git-worktree tests that assume `main` (e.g. the
// shared-branch-group reliability suite) in CI only. These GIT_CONFIG_* env
// vars apply the setting to all child git invocations without mutating the
// developer's global config. Appended (not clobbered) if a count already exists.
(() => {
const existing = Number.parseInt(process.env.GIT_CONFIG_COUNT ?? "0", 10) || 0;
process.env[`GIT_CONFIG_KEY_${existing}`] = "init.defaultBranch";
process.env[`GIT_CONFIG_VALUE_${existing}`] = "main";
process.env.GIT_CONFIG_COUNT = String(existing + 1);
})();
function ensureValidCwd(): string {
try {
return originalCwd();