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, 9 insertions, 9 deletions

diff --git a/crates/shirabe/src/repository/filesystem_repository.rs b/crates/shirabe/src/repository/filesystem_repository.rs
index 0dae316..14365f2 100644
--- a/crates/shirabe/src/repository/filesystem_repository.rs
+++ b/crates/shirabe/src/repository/filesystem_repository.rs
@@ -14,7 +14,7 @@ use shirabe_php_shim::{
 
 use crate::config::is_php_integer_key;
 use crate::installed_versions::InstalledVersions;
-use crate::installer::InstallationManager;
+use crate::installer::InstallationManagerInterface;
 use crate::json::JsonFile;
 use crate::package::BasePackageHandle;
 use crate::package::PackageInterfaceHandle;
@@ -209,7 +209,7 @@ impl FilesystemRepository {
     pub fn write(
         &mut self,
         dev_mode: bool,
-        installation_manager: &mut InstallationManager,
+        installation_manager: &mut dyn InstallationManagerInterface,
     ) -> Result<()> {
         let mut data: IndexMap<String, PhpMixed> = IndexMap::new();
         data.insert("packages".to_string(), PhpMixed::List(vec![]));
@@ -239,11 +239,7 @@ impl FilesystemRepository {
             if let Some(path_str) = &path
                 && !path_str.is_empty()
             {
-                let normalized_path = self.filesystem.borrow_mut().normalize_path(&if self
-                    .filesystem
-                    .borrow()
-                    .is_absolute_path(path_str)
-                {
+                let path_to_normalize = if self.filesystem.borrow().is_absolute_path(path_str) {
                     path_str.clone()
                 } else {
                     format!(
@@ -251,7 +247,11 @@ impl FilesystemRepository {
                         Platform::get_cwd(false).unwrap_or_default(),
                         path_str
                     )
-                });
+                };
+                let normalized_path = self
+                    .filesystem
+                    .borrow_mut()
+                    .normalize_path(&path_to_normalize);
                 install_path = Some(self.filesystem.borrow_mut().find_shortest_path(
                     &repo_dir,
                     &normalized_path,
@@ -453,7 +453,7 @@ impl FilesystemRepository {
     /// @param array<string, string> $installPaths
     fn generate_installed_versions(
         &mut self,
-        installation_manager: &InstallationManager,
+        installation_manager: &dyn InstallationManagerInterface,
         install_paths: &IndexMap<String, Option<String>>,
         dev_mode: bool,
         repo_dir: &str,