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, 17 insertions, 0 deletions

diff --git a/crates/shirabe/tests/command/global_command_test.rs b/crates/shirabe/tests/command/global_command_test.rs
index 274f5cf..7877b3c 100644
--- a/crates/shirabe/tests/command/global_command_test.rs
+++ b/crates/shirabe/tests/command/global_command_test.rs
@@ -1,10 +1,27 @@
 //! ref: composer/tests/Composer/Test/Command/GlobalCommandTest.php
 
+use shirabe::util::platform::Platform;
+
+fn tear_down() {
+    Platform::clear_env("COMPOSER_HOME");
+    Platform::clear_env("COMPOSER");
+}
+
+struct TearDown;
+
+impl Drop for TearDown {
+    fn drop(&mut self) {
+        tear_down();
+    }
+}
+
 macro_rules! stub {
     ($name:ident) => {
         #[test]
         #[ignore = "requires the ApplicationTester/initTempComposer harness, which is not yet ported"]
         fn $name() {
+            let _tear_down = TearDown;
+
             todo!()
         }
     };