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fix(tests): use /dev/null as the empty global git config on Windows too - #8746
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…tform Git for Windows 2.56 rejects GIT_CONFIG_GLOBAL=NUL with "fatal: unable to access 'NUL': Invalid argument". The test fixture env and the preload's git config guard both set it on win32, so every fixture repository and the guard's first check failed on that git. Git for Windows maps /dev/null to its null device, and a git that did not would read the path as a missing file, which is also an empty config. One exported constant now feeds the fixture env, the guard and the oracle, and a new case runs the installed git with the fixture env.
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Summary
Problem. On Windows with Git for Windows 2.56, a large block of the test suite fails on every branch for reasons unrelated to the code under test. The shared test git environment (
tests/helpers/git-fixture.ts) and the preload's.git/configguard (tests/helpers/git-config-guard.ts) setGIT_CONFIG_GLOBAL=NULon win32, and git 2.56 refuses that value outright:So every fixture repository fails to initialise, and the guard reports "git could not parse the checkout's common .git/config" on the first case of every file. Contributors on Windows currently work around it by pointing
OCX_GIT_CONFIG_GUARD_CHECKOUTat a directory with no.git, which also switches the guard off.After this PR. The empty global config is
/dev/nullon every platform, exported once asEMPTY_GLOBAL_GIT_CONFIGand used by the fixture env, the guard, and the isolation test's oracle env. Linux and macOS behaviour is unchanged (they already used/dev/null).Why
/dev/nullis safe on Windows. Git for Windows maps/dev/nullto its null device (verified on 2.56 from a native Bun spawn, not only from Git Bash). A Git for Windows build that did not map it would see a missing file, which git treats as an empty global config — the intent either way. Probed on 2.56 from Bun:NUL→ exit 128;/dev/null,nul→ exit 0.Details.
tests/helpers/git-fixture.ts: new exportedEMPTY_GLOBAL_GIT_CONFIG = "/dev/null"with the reason in a comment;fixtureGitEnvuses it.tests/helpers/git-config-guard.ts: imports the constant instead of its ownNULbranch.tests/ci-workflows/test-git-isolation.test.ts: oracle env and the env assertion use the constant; a new case runs the installed git withfixtureGitEnv()(git config --global --list) and requires exit 0 with empty stderr, so a git that rejects the value fails loudly instead of failing dozens of unrelated cases.devlog/_plan/261113_test_git_env_isolation/010_phase1.md: the one line describing the old per-platform value.Verification
Windows 11, Git for Windows 2.56.0.windows.1, Bun 1.4.4. Same 12 files on clean
upstream/dev(873ec9b) and on this branch, run withbun scripts/test.ts <files>and without theOCX_GIT_CONFIG_GUARD_CHECKOUTworkaround: every file that importstests/helpers/git-fixture.tsor the guard (ci-workflows/{build-release-changelog,ci-gui-typecheck-gate,ci-review-lanes,ci-test-lane,release-version-sources,repo-hygiene,repo-import-resolution,structure-ssot,test-git-isolation,test-runner},gui/platform-dialog-guard,test-layout-tooling).upstream/devThe 2 remaining failures also fail on
upstream/devand are not caused by the null-device value:test-runner > changed-mode uses the shared merge base…hits the 5 s timeout insidecommitFixtureon this Windows host, andtest-git-isolation > test preload > fails the case after which the guarded checkout's config changednow reaches the guard correctly (it reportsuser.name changed) but the probe output on Windows does not contain the(pass) leaves the config aloneline the assertion looks for. Both are left for a separate change.bun run typecheck— no type errors.bun run structure:check— passed.Checklist
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