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, 16 insertions, 0 deletions

diff --git a/crates/shirabe/tests/downloader/perforce_downloader_test.rs b/crates/shirabe/tests/downloader/perforce_downloader_test.rs
index 41ced48..e0f7637 100644
--- a/crates/shirabe/tests/downloader/perforce_downloader_test.rs
+++ b/crates/shirabe/tests/downloader/perforce_downloader_test.rs
@@ -1,28 +1,44 @@
 //! ref: composer/tests/Composer/Test/Downloader/PerforceDownloaderTest.php
 
+use tempfile::TempDir;
+
+fn set_up() -> TempDir {
+    let test_path = TempDir::new().unwrap();
+    // repoConfig/config/io/processExecutor/repository/package/downloader rely on
+    // ProcessExecutorMock and PHPUnit mocks of the repository and Package, which are not
+    // ported.
+    let () = todo!();
+    #[allow(unreachable_code)]
+    test_path
+}
+
 // These mock Perforce, the repository config and a Package to drive PerforceDownloader's
 // initialization and install paths; mocking is not available here.
 
 #[test]
 #[ignore = "mocks Perforce/repository/Package; mocking is not available"]
 fn test_init_perforce_instantiates_a_new_perforce_object() {
+    let _test_path = set_up();
     todo!()
 }
 
 #[test]
 #[ignore = "mocks Perforce/repository/Package; mocking is not available"]
 fn test_init_perforce_does_nothing_if_perforce_already_set() {
+    let _test_path = set_up();
     todo!()
 }
 
 #[test]
 #[ignore = "mocks Perforce/repository/Package; mocking is not available"]
 fn test_do_install_with_tag() {
+    let _test_path = set_up();
     todo!()
 }
 
 #[test]
 #[ignore = "mocks Perforce/repository/Package; mocking is not available"]
 fn test_do_install_with_no_tag() {
+    let _test_path = set_up();
     todo!()
 }