test(tests): port setUp/tearDown as set_up/tear_down with TearDown

Port PHP setUp/tearDown across the ported integration tests using
same-named set_up()/tear_down() functions and a TearDown struct whose
Drop runs tear_down(). Fixture-init setUp returns its fixtures;
tmpdir-style setUp/tearDown carry state in TearDown fields. Parts that
depend on unported infrastructure (PHPUnit mocks, Config::merge, the PHP
error handler) stay todo!() and are only wired into ignored stubs to
avoid breaking live tests.

Also fix shirabe-php-shim putenv to handle the no-'=' form (PHP unsets
the variable), which Platform::clear_env relies on for the env-clearing
tearDowns.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/crates/shirabe/tests/repository/vcs_repository_test.rs b/crates/shirabe/tests/repository/vcs_repository_test.rs
index b9486fc..c687b3d 100644
--- a/crates/shirabe/tests/repository/vcs_repository_test.rs
+++ b/crates/shirabe/tests/repository/vcs_repository_test.rs
@@ -1,10 +1,55 @@
 //! ref: composer/tests/Composer/Test/Repository/VcsRepositoryTest.php
 
+use shirabe::util::filesystem::Filesystem;
+
+struct SetUp {
+    composer_home: std::path::PathBuf,
+    git_repo: std::path::PathBuf,
+}
+
+fn set_up() -> SetUp {
+    // setUp lazily runs initialize(), which shells out to git to build a fixture repository
+    // on disk; the ExecutableFinder/ProcessExecutor-driven setup and the markTestSkipped
+    // skip path are not ported.
+    todo!()
+}
+
+fn tear_down(composer_home: &std::path::Path, git_repo: &std::path::Path) {
+    let mut fs = Filesystem::new(None);
+    fs.remove_directory(composer_home).unwrap();
+    fs.remove_directory(git_repo).unwrap();
+}
+
+struct TearDown {
+    composer_home: std::path::PathBuf,
+    git_repo: std::path::PathBuf,
+}
+
+impl TearDown {
+    fn new(composer_home: std::path::PathBuf, git_repo: std::path::PathBuf) -> Self {
+        TearDown {
+            composer_home,
+            git_repo,
+        }
+    }
+}
+
+impl Drop for TearDown {
+    fn drop(&mut self) {
+        tear_down(&self.composer_home, &self.git_repo);
+    }
+}
+
 // testLoadVersions initialises a real git repository on disk and drives a VcsRepository over
 // it, then asserts the loaded package versions; the git fixture setup and constraint parsing
 // (look-around regex) are not ported.
 #[test]
 #[ignore = "not yet ported (initialises a git repo on disk and loads versions; constraint parsing uses a look-around regex)"]
 fn test_load_versions() {
+    let SetUp {
+        composer_home,
+        git_repo,
+    } = set_up();
+    let _tear_down = TearDown::new(composer_home, git_repo);
     todo!()
 }