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, 82 insertions, 0 deletions

diff --git a/crates/shirabe/src/util/perforce.rs b/crates/shirabe/src/util/perforce.rs
index 4d4ddef..d8cd39d 100644
--- a/crates/shirabe/src/util/perforce.rs
+++ b/crates/shirabe/src/util/perforce.rs
@@ -838,3 +838,85 @@ impl Perforce {
             .clone()
     }
 }
+
+/// Seam over `Perforce` so consumers can be exercised with a mock in tests.
+pub trait PerforceInterface: std::fmt::Debug {
+    fn initialize_path(&mut self, path: &str);
+    fn set_stream(&mut self, stream: &str);
+    fn p4_login(&mut self) -> Result<()>;
+    fn check_stream(&mut self) -> bool;
+    fn write_p4_client_spec(&mut self) -> Result<()>;
+    fn connect_client(&mut self) -> Result<()>;
+    fn sync_code_base(&mut self, source_reference: Option<String>) -> Result<()>;
+    fn cleanup_client_spec(&mut self);
+    fn get_commit_logs(&mut self, from_reference: &str, to_reference: &str) -> Option<String>;
+    fn get_file_content(&mut self, file: &str, identifier: &str) -> Option<String>;
+    fn get_branches(&mut self) -> IndexMap<String, String>;
+    fn get_tags(&mut self) -> IndexMap<String, String>;
+    fn get_user(&self) -> Option<String>;
+    fn get_composer_information(
+        &mut self,
+        identifier: &str,
+    ) -> Result<Option<IndexMap<String, PhpMixed>>>;
+}
+
+impl PerforceInterface for Perforce {
+    fn initialize_path(&mut self, path: &str) {
+        Perforce::initialize_path(self, path)
+    }
+
+    fn set_stream(&mut self, stream: &str) {
+        Perforce::set_stream(self, stream)
+    }
+
+    fn p4_login(&mut self) -> Result<()> {
+        Perforce::p4_login(self)
+    }
+
+    fn check_stream(&mut self) -> bool {
+        Perforce::check_stream(self)
+    }
+
+    fn write_p4_client_spec(&mut self) -> Result<()> {
+        Perforce::write_p4_client_spec(self)
+    }
+
+    fn connect_client(&mut self) -> Result<()> {
+        Perforce::connect_client(self)
+    }
+
+    fn sync_code_base(&mut self, source_reference: Option<String>) -> Result<()> {
+        Perforce::sync_code_base(self, source_reference.as_deref())
+    }
+
+    fn cleanup_client_spec(&mut self) {
+        Perforce::cleanup_client_spec(self)
+    }
+
+    fn get_commit_logs(&mut self, from_reference: &str, to_reference: &str) -> Option<String> {
+        Perforce::get_commit_logs(self, from_reference, to_reference)
+    }
+
+    fn get_file_content(&mut self, file: &str, identifier: &str) -> Option<String> {
+        Perforce::get_file_content(self, file, identifier)
+    }
+
+    fn get_branches(&mut self) -> IndexMap<String, String> {
+        Perforce::get_branches(self)
+    }
+
+    fn get_tags(&mut self) -> IndexMap<String, String> {
+        Perforce::get_tags(self)
+    }
+
+    fn get_user(&self) -> Option<String> {
+        Perforce::get_user(self)
+    }
+
+    fn get_composer_information(
+        &mut self,
+        identifier: &str,
+    ) -> Result<Option<IndexMap<String, PhpMixed>>> {
+        Perforce::get_composer_information(self, identifier)
+    }
+}