test: port Composer tests unblocked by mockall, add seams

Port 11 categories of previously-ignored Composer tests now reachable with
the mockall crate: DownloadManager, VCS/Perforce/File downloaders,
VersionSelector, PlatformRepository, Auditor, installer/FilesystemRepository,
RootPackageLoader, util auth/http, commands, and Cache.

Extract test seams additively on concrete structs as *Interface traits
(Runtime, HhvmDetector, VersionGuesser, RepositorySet, Perforce,
BinaryInstaller) plus mock-field seams (Cache, Filesystem); consumers take
trait objects. Mocks are defined locally in the test crates via
mockall::mock!, since automock-generated mocks are cfg(test)-gated and
invisible across the integration-test boundary.

dataProviders are ported in full; tests blocked by unported shims stay
#[ignore] with documented reasons rather than reduced or weakened.

Fix product bugs surfaced by the ports:
- util/github: use the exception code, not the HTTP status, for 401/403
- advisory: serialize empty audit maps as [] to match PHP json_encode
- repository/filesystem and downloader/file: fix RefCell double-borrow panics

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

1 files changed, 48 insertions, 14 deletions

diff --git a/crates/shirabe/tests/cache_test.rs b/crates/shirabe/tests/cache_test.rs
index 2e18856..7705714 100644
--- a/crates/shirabe/tests/cache_test.rs
+++ b/crates/shirabe/tests/cache_test.rs
@@ -4,7 +4,7 @@ use std::cell::RefCell;
 use std::fs;
 use std::rc::Rc;
 
-use shirabe::cache::Cache;
+use shirabe::cache::{Cache, CacheMock, GcFinderMock};
 use shirabe::io::IOInterface;
 use shirabe::io::null_io::NullIO;
 use shirabe::util::filesystem::Filesystem;
@@ -27,8 +27,10 @@ fn set_up() -> SetUp {
         files.push(path);
     }
 
-    // The finder/filesystem/IO mocks and the Cache mock overriding getFinder are not ported.
-    let cache: Cache = todo!();
+    // PHP mocks Cache::getFinder and keeps the real Filesystem; here the CacheMock finder seam plays
+    // that role and the Cache otherwise operates on the real temp directory.
+    let io: Rc<RefCell<dyn IOInterface>> = Rc::new(RefCell::new(NullIO::new()));
+    let cache = Cache::new(io, root.path().to_str().unwrap(), None, None, false);
 
     SetUp { root, files, cache }
 }
@@ -56,25 +58,57 @@ impl Drop for TearDown {
     }
 }
 
-// In PHP these mock Cache::getFinder() to feed the gc() routine a controlled set of
-// files. getFinder is pub(crate) and cannot be overridden from a test, so the
-// finder-driven removal paths cannot be exercised faithfully here.
-#[ignore = "requires mocking Cache::get_finder (pub(crate), PHPUnit MockObject) to feed gc() a controlled Finder iterator; not overridable from a test"]
 #[test]
 fn test_remove_outdated_files() {
-    let SetUp { root, files, cache } = set_up();
+    let SetUp {
+        root,
+        files,
+        mut cache,
+    } = set_up();
     let _tear_down = TearDown::new(root.path().to_path_buf());
-    let _ = (&files, &cache);
-    todo!()
+
+    // The date('until ...') finder yields the outdated entries (files 1..3).
+    let outdated = files[1..].to_vec();
+    cache.__set_mock(CacheMock {
+        finder: Some(GcFinderMock {
+            outdated,
+            by_accessed_time: Vec::new(),
+        }),
+        ..Default::default()
+    });
+
+    cache.gc(600, 1024 * 1024 * 1024);
+
+    for (i, file) in files.iter().enumerate().skip(1) {
+        assert!(!file.exists(), "cached.file{i}.zip should be removed");
+    }
+    assert!(files[0].exists(), "cached.file0.zip should still exist");
 }
 
-#[ignore = "requires mocking Cache::get_finder (pub(crate), PHPUnit MockObject) to feed gc() a controlled Finder iterator; not overridable from a test"]
 #[test]
 fn test_remove_files_when_cache_is_too_large() {
-    let SetUp { root, files, cache } = set_up();
+    let SetUp {
+        root,
+        files,
+        mut cache,
+    } = set_up();
     let _tear_down = TearDown::new(root.path().to_path_buf());
-    let _ = (&files, &cache);
-    todo!()
+
+    // The date filter matches nothing; the size-bound pass walks all files by accessed time.
+    cache.__set_mock(CacheMock {
+        finder: Some(GcFinderMock {
+            outdated: Vec::new(),
+            by_accessed_time: files.clone(),
+        }),
+        ..Default::default()
+    });
+
+    cache.gc(600, 1500);
+
+    for (i, file) in files.iter().enumerate().take(3) {
+        assert!(!file.exists(), "cached.file{i}.zip should be removed");
+    }
+    assert!(files[3].exists(), "cached.file3.zip should still exist");
 }
 
 #[test]