test(tests): use mockall for hand-written interface mocks

Replace hand-written mock/stub structs that re-implemented PHPUnit
mock-builder behavior (record-and-verify, manual call counters,
unreachable!() guards) with mockall::mock! locals across:

- package/loader: MockLoader, VersionGuesserMock
- command: ArchiveManager/RepositoryManager/EventDispatcher mocks
- util: ConfigSource/AuthJson mocks (auth_helper, bitbucket, github,
  forgejo, gitlab)
- repository/vcs: github_driver NullConfigSource
- installer: CountingInstaller, RecordingBinaryInstaller, and the
  DownloadManager mock (formerly common/downloader_stub.rs, now deleted)
- downloader: download_manager create_downloader_mock

Verification (counts/args) now lives in mockall expectations checked on
drop. installation_manager BinaryInstaller is left hand-written because
its as_binary_presence_interface seam returns Some(&mut self), which
mockall cannot express; io_stub and io_mock are left as-is.

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

1 files changed, 1 insertions, 2 deletions

diff --git a/crates/shirabe/tests/downloader/download_manager_test.rs b/crates/shirabe/tests/downloader/download_manager_test.rs
index 10fd1a9..e18643e 100644
--- a/crates/shirabe/tests/downloader/download_manager_test.rs
+++ b/crates/shirabe/tests/downloader/download_manager_test.rs
@@ -11,7 +11,6 @@ use shirabe::package::handle::{CompletePackageHandle, PackageInterfaceHandle};
 use shirabe_php_shim::{PhpMixed, RuntimeException};
 use shirabe_semver::VersionParser;
 
-use crate::downloader_stub::DownloaderStub;
 use crate::io_stub::IOStub;
 
 // PHP mocks `Composer\Downloader\DownloaderInterface` with getMockBuilder.
@@ -95,7 +94,7 @@ fn make_package(name: &str, is_dev: bool) -> PackageInterfaceHandle {
 
 /// ref: DownloadManagerTest::createDownloaderMock
 fn create_downloader_mock() -> Rc<RefCell<dyn DownloaderInterface>> {
-    Rc::new(RefCell::new(DownloaderStub::new())) as Rc<RefCell<dyn DownloaderInterface>>
+    as_dyn(MockDownloader::new())
 }
 
 /// A `createDownloaderMock()` whose `getInstallationSource()` reports the given