From 6f4667d96f08b05f4e09082c42412a974637d8d0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=8E=8B=E5=BE=B7=E5=AE=87?= <kvtodev@outlook.com>
Date: Wed, 7 Oct 2026 11:45:02 +0800
Subject: [PATCH] =?UTF-8?q?=E8=A1=A5fnm=E9=BB=98=E8=AE=A4=E5=88=AB?=
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- 新增单测 fnm_default_alias_symlink_selects_the_linked_installation，断言 default 别名选中该链接的 v20 而不是最高的 v22
- 核实评审该项前提有误：fnm 1.39 的 aliases/default 是指向安装目录的符号链接，当前实现本就正确
---
 .../src-tauri/src/environment_check.rs        | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/apps/ai-game-creator-shell/src-tauri/src/environment_check.rs b/apps/ai-game-creator-shell/src-tauri/src/environment_check.rs
index 72d2284ed..fbe50c395 100644
--- a/apps/ai-game-creator-shell/src-tauri/src/environment_check.rs
+++ b/apps/ai-game-creator-shell/src-tauri/src/environment_check.rs
@@ -1294,6 +1294,28 @@ mod tests {
         assert_eq!(default.version, (22, 23, 3));
     }
 
+    #[cfg(unix)]
+    #[test]
+    fn fnm_default_alias_symlink_selects_the_linked_installation() {
+        use std::os::unix::fs::symlink;
+
+        let fnm_root = tempfile::tempdir().unwrap();
+        let older = install_fnm_version(fnm_root.path(), "v20.11.0");
+        install_fnm_version(fnm_root.path(), "v22.23.3");
+        let alias_dir = fnm_root.path().join("aliases");
+        fs::create_dir_all(&alias_dir).unwrap();
+        // fnm 1.39 的 default 别名是指向安装目录的符号链接，不是版本字符串文件。
+        symlink(&older, alias_dir.join("default")).unwrap();
+        let installed = installed_node_versions(&[fnm_root.path().to_path_buf()], &[]);
+        assert_eq!(installed.len(), 2);
+        let default =
+            default_managed_installation(&installed, &[fnm_root.path().to_path_buf()], &[])
+                .expect("fnm default alias should resolve");
+        // 必须跟随别名选中 v20，而不是回退到最高的 v22。
+        assert_eq!(default.prefix, older.canonicalize().unwrap());
+        assert_eq!(default.version, (20, 11, 0));
+    }
+
     #[test]
     fn version_file_pin_is_authoritative_and_blocks_when_not_installed() {
         let fnm_root = tempfile::tempdir().unwrap();