test(zip): detail why the zip-extension test stays ignored

PHP only runs this test when the zip extension is not loaded; the Rust
port has unconditional zip support, so that precondition cannot exist.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/crates/shirabe/tests/util/zip_test.rs b/crates/shirabe/tests/util/zip_test.rs
index 0c7d96a1..e3e976de 100644
--- a/crates/shirabe/tests/util/zip_test.rs
+++ b/crates/shirabe/tests/util/zip_test.rs
@@ -11,8 +11,12 @@ fn fixture(name: &str) -> String {
     )
 }
 
+// TODO(phase-d): PHP runs this test only when the zip extension is NOT loaded (it is
+// markTestSkipped otherwise). The Rust port links zip support unconditionally, so the
+// "extension not loaded" precondition cannot exist and the expected RuntimeException
+// ("The Zip Util requires PHP's zip extension") is unreachable by design.
 #[test]
-#[ignore = "skipped in PHP whenever the zip extension is loaded, which it always is here"]
+#[ignore = "requires a PHP runtime without the zip extension; the Rust port has unconditional zip support, so this precondition is impossible to reproduce"]
 fn test_throws_exception_if_zip_extension_is_not_loaded() {
     assert!(Zip::get_composer_json("").is_err());
 }