test(util): port ZipTest

Zip::get_composer_json relies on ZipArchive, whose constructor is a
todo!() in the php-shim, so all cases are #[ignore] while compiling.
Reuses the existing PHP Fixtures/Zip archives.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2 files changed, 76 insertions, 0 deletions

diff --git a/crates/shirabe/tests/util/main.rs b/crates/shirabe/tests/util/main.rs
index e0ce148..7bcdc96 100644
--- a/crates/shirabe/tests/util/main.rs
+++ b/crates/shirabe/tests/util/main.rs
@@ -6,3 +6,4 @@ mod platform_test;
 mod silencer_test;
 mod tar_test;
 mod url_test;
+mod zip_test;
diff --git a/crates/shirabe/tests/util/zip_test.rs b/crates/shirabe/tests/util/zip_test.rs
index 2d85522..07f5629 100644
--- a/crates/shirabe/tests/util/zip_test.rs
+++ b/crates/shirabe/tests/util/zip_test.rs
@@ -1 +1,76 @@
 //! ref: composer/tests/Composer/Test/Util/ZipTest.php
+
+use shirabe::util::zip::Zip;
+
+/// Reuses the PHP fixtures under composer/tests/Composer/Test/Util/Fixtures/Zip.
+fn fixture(name: &str) -> String {
+    format!(
+        "{}/../../composer/tests/Composer/Test/Util/Fixtures/Zip/{}",
+        env!("CARGO_MANIFEST_DIR"),
+        name
+    )
+}
+
+#[test]
+#[ignore = "skipped in PHP whenever the zip extension is loaded, which it always is here"]
+fn test_throws_exception_if_zip_extension_is_not_loaded() {
+    assert!(Zip::get_composer_json("").is_err());
+}
+
+#[test]
+#[ignore = "ZipArchive::new is todo!() in the php-shim"]
+fn test_returns_nullif_the_zip_is_not_found() {
+    let result = Zip::get_composer_json(&fixture("invalid.zip")).unwrap();
+
+    assert_eq!(None, result);
+}
+
+#[test]
+#[ignore = "ZipArchive::new is todo!() in the php-shim"]
+fn test_returns_null_if_the_zip_is_empty() {
+    let result = Zip::get_composer_json(&fixture("empty.zip")).unwrap();
+
+    assert_eq!(None, result);
+}
+
+#[test]
+#[ignore = "ZipArchive::new is todo!() in the php-shim"]
+fn test_throws_exception_if_the_zip_has_no_composer_json() {
+    assert!(Zip::get_composer_json(&fixture("nojson.zip")).is_err());
+}
+
+#[test]
+#[ignore = "ZipArchive::new is todo!() in the php-shim"]
+fn test_throws_exception_if_the_composer_json_is_in_a_sub_subfolder() {
+    assert!(Zip::get_composer_json(&fixture("subfolders.zip")).is_err());
+}
+
+#[test]
+#[ignore = "ZipArchive::new is todo!() in the php-shim"]
+fn test_returns_composer_json_in_zip_root() {
+    let result = Zip::get_composer_json(&fixture("root.zip")).unwrap();
+
+    assert_eq!(Some("{\n    \"name\": \"foo/bar\"\n}\n".to_string()), result);
+}
+
+#[test]
+#[ignore = "ZipArchive::new is todo!() in the php-shim"]
+fn test_returns_composer_json_in_first_folder() {
+    let result = Zip::get_composer_json(&fixture("folder.zip")).unwrap();
+
+    assert_eq!(Some("{\n    \"name\": \"foo/bar\"\n}\n".to_string()), result);
+}
+
+#[test]
+#[ignore = "ZipArchive::new is todo!() in the php-shim"]
+fn test_multiple_top_level_dirs_is_invalid() {
+    assert!(Zip::get_composer_json(&fixture("multiple.zip")).is_err());
+}
+
+#[test]
+#[ignore = "ZipArchive::new is todo!() in the php-shim"]
+fn test_returns_composer_json_from_first_subfolder() {
+    let result = Zip::get_composer_json(&fixture("single-sub.zip")).unwrap();
+
+    assert_eq!(Some("{\n    \"name\": \"foo/bar\"\n}\n".to_string()), result);
+}