From 375cc4f1fa780ba85b970d18c17dcd8643dc007c Mon Sep 17 00:00:00 2001
From: AskaEth <i@yeij.top>
Date: Fri, 13 Nov 2026 00:31:14 +0800
Subject: [PATCH] =?UTF-8?q?test(presenter):=20junction=20=E5=A4=B9?=
 =?UTF-8?q?=E5=85=B7=E6=94=B9=E6=88=90=E9=80=90=E6=AE=B5=20join=EF=BC=88?=
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 =?UTF-8?q?=E8=AE=A9=20mklink=20=E6=8A=A5=E6=97=A0=E6=95=88=E8=AF=AD?=
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---
 crates/core/tests/child_quiet_guard.rs  | 6 ++++++
 crates/presenter/src/host/game/roots.rs | 4 +++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/crates/core/tests/child_quiet_guard.rs b/crates/core/tests/child_quiet_guard.rs
index 3f994be..89ca7f7 100644
--- a/crates/core/tests/child_quiet_guard.rs
+++ b/crates/core/tests/child_quiet_guard.rs
@@ -35,6 +35,12 @@
 //! `app-iced/src/platform/locale.rs` 的 `quiet(program)` 改回裸构造 ⇒ 红（用户报的那处
 //! `reg.exe`）；⑦`export.rs` 三个 opener 留裸 + 清单写明理由 ⇒ **不**红。
 //!
+//! M291（`presenter` 的 junction 夹具）：⑧`host/game/roots.rs` 的 `make_dir_link` 改回裸
+//! `Command::new("cmd")` ⇒ 红并点名 `crates/presenter/src/host/game/roots.rs:146`。这一条同时钉
+//! 一处**收并**：改之前本守卫一次抓到两处（`mklink /J` 的产品副本 `roots.rs:193` 与测试副本
+//! `tests_multiroot.rs:83`），M291 把两份收成一个共享夹具（`roots::make_dir_link`，`#[cfg(test)]`），
+//! 所以现在的变异只可能剩一处。
+//!
 //! ## P1-1：守卫自己被变异验了两遍才对的
 //!
 //! ③第一次**没红**：断言搜整份源码，而 `quiet` 的文档注释里就写着
diff --git a/crates/presenter/src/host/game/roots.rs b/crates/presenter/src/host/game/roots.rs
index 6bad2a9..0a0b6d3 100644
--- a/crates/presenter/src/host/game/roots.rs
+++ b/crates/presenter/src/host/game/roots.rs
@@ -194,7 +194,9 @@ mod tests {
     #[test]
     fn junction_to_the_same_folder_is_one_root() {
         let root = temp_root("ull-roots-junction");
-        let target = root.join("official/.minecraft");
+        // 逐段 `join`：`join("official/.minecraft")` 会留下正斜杠，而 `cmd` 把 `/` 当开关前缀，
+        // `mklink` 于是报「无效语法」⇒ 这条用例一直走的是下面的「跳过」分支（M291 实测）。
+        let target = root.join("official").join(".minecraft");
         std::fs::create_dir_all(target.join("versions")).expect("建目录");
         let link = root.join("linked");
         if !make_dir_link(&link, &target) {