fix: clean successful plugin rollback backups

tests/test_plugin_install_backup_cleanup.py

@@ -0,0 +1,88 @@
+"""插件安装成功后的临时回滚备份生命周期测试。"""
+
+from pathlib import Path
+
+import pytest
+
+from app.adapters.external.market import PluginHelper
+
+
+@pytest.mark.asyncio
+async def test_successful_install_flows_remove_transient_backups(
+    monkeypatch,
+    tmp_path: Path,
+) -> None:
+    """同步与异步安装成功后都必须删除临时回滚副本。"""
+    helper = PluginHelper()
+    sync_backup = tmp_path / "sync-backup"
+    async_backup = tmp_path / "async-backup"
+    sync_backup.mkdir()
+    async_backup.mkdir()
+
+    monkeypatch.setattr(
+        helper,
+        "_PluginHelper__backup_plugin",
+        lambda _pid: str(sync_backup),
+    )
+    monkeypatch.setattr(
+        helper,
+        "_PluginHelper__remove_old_plugin",
+        lambda _pid: None,
+    )
+    monkeypatch.setattr(
+        helper,
+        "_PluginHelper__install_dependencies_if_required",
+        lambda _pid: (False, False, "不存在依赖"),
+    )
+    monkeypatch.setattr(
+        helper,
+        "refresh_persistent_plugin_backup",
+        lambda _pid: True,
+    )
+
+    sync_result = helper._PluginHelper__install_flow_sync(
+        "DemoPlugin",
+        False,
+        lambda: (True, ""),
+    )
+
+    async def backup_plugin(_pid: str) -> str:
+        """返回异步路径的临时回滚副本。"""
+        return str(async_backup)
+
+    async def remove_plugin(_pid: str) -> None:
+        """隔离测试中的真实插件目录删除。"""
+
+    async def install_dependencies(_pid: str) -> tuple[bool, bool, str]:
+        """表示测试插件没有额外依赖。"""
+        return False, False, "不存在依赖"
+
+    async def prepare_content() -> tuple[bool, str]:
+        """表示异步内容准备成功。"""
+        return True, ""
+
+    monkeypatch.setattr(
+        helper,
+        "_PluginHelper__async_backup_plugin",
+        backup_plugin,
+    )
+    monkeypatch.setattr(
+        helper,
+        "_PluginHelper__async_remove_old_plugin",
+        remove_plugin,
+    )
+    monkeypatch.setattr(
+        helper,
+        "_PluginHelper__async_install_dependencies_if_required",
+        install_dependencies,
+    )
+
+    async_result = await helper._PluginHelper__install_flow_async(
+        "DemoPlugin",
+        False,
+        prepare_content,
+    )
+
+    assert sync_result == async_result == (True, "")
+    assert not sync_backup.exists()
+    assert not async_backup.exists()