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, 7 insertions, 0 deletions

diff --git a/crates/shirabe/tests/installer/metapackage_installer_test.rs b/crates/shirabe/tests/installer/metapackage_installer_test.rs
index daf2e20..60aac92 100644
--- a/crates/shirabe/tests/installer/metapackage_installer_test.rs
+++ b/crates/shirabe/tests/installer/metapackage_installer_test.rs
@@ -13,6 +13,13 @@ use shirabe::repository::{InstalledArrayRepository, RepositoryInterface};
 
 use crate::test_case::get_package;
 
+/// Builds mocked repository/IO and a MetapackageInstaller over them. The mocks
+/// are not available here; the live tests below intentionally diverge to use a
+/// real InstalledArrayRepository instead, so this stub is not injected.
+fn set_up() {
+    todo!()
+}
+
 fn run<F: std::future::Future>(future: F) -> F::Output {
     tokio::runtime::Builder::new_current_thread()
         .build()