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, 34 insertions, 1 deletions

diff --git a/crates/shirabe/tests/util/ini_helper_test.rs b/crates/shirabe/tests/util/ini_helper_test.rs
index e214a78..59dc967 100644
--- a/crates/shirabe/tests/util/ini_helper_test.rs
+++ b/crates/shirabe/tests/util/ini_helper_test.rs
@@ -1,7 +1,40 @@
 //! ref: composer/tests/Composer/Test/Util/IniHelperTest.php
 
 use shirabe::util::ini_helper::IniHelper;
-use shirabe_php_shim::{PATH_SEPARATOR, putenv};
+use shirabe::util::platform::Platform;
+use shirabe_php_shim::{PATH_SEPARATOR, getenv, putenv};
+
+#[allow(dead_code)]
+fn set_up() -> TearDown {
+    // Register our name with XdebugHandler.
+    // TODO: XdebugHandler is the external composer/xdebug-handler package and is not ported.
+    todo!();
+    // Save current state
+    #[allow(unreachable_code)]
+    let env_original = getenv("COMPOSER_ORIGINAL_INIS");
+    TearDown { env_original }
+}
+
+#[allow(dead_code)]
+fn tear_down(env_original: &Option<String>) {
+    // Restore original state
+    if let Some(env_original) = env_original {
+        putenv(&format!("COMPOSER_ORIGINAL_INIS={env_original}"));
+    } else {
+        Platform::clear_env("COMPOSER_ORIGINAL_INIS");
+    }
+}
+
+#[allow(dead_code)]
+struct TearDown {
+    env_original: Option<String>,
+}
+
+impl Drop for TearDown {
+    fn drop(&mut self) {
+        tear_down(&self.env_original);
+    }
+}
 
 fn set_env(paths: &[&str]) {
     putenv(&format!(