Unlucky Launcher v0.0.1-alpha

Rust 原生单文件 Minecraft 启动器：CLI 完整可用（install/launch/accounts/java/diagnose/agent），
MCP server 接入外部 Agent 工具，GUI 开发中。

crates/core/tests/game/java_discover.rs

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+//! `core::game::java::discover`：标准安装位置扫描与来源优先级。
+//!
+//! 真机上扫到什么取决于本机装了什么，所以断言只钉**不变量**：
+//! 扫描结果形状、来源优先级（env 胜过扫盘）、去重保留高优先级、缺目录不报错。
+
+use unlucky_core::game::java::discover;
+use unlucky_core::game::java::mapping::{JavaRequirement, RequirementSource};
+use unlucky_core::game::java::{pick, JavaOrigin, JavaRuntime};
+
+fn runtime(path: &str, major: u32, origin: JavaOrigin) -> JavaRuntime {
+    JavaRuntime {
+        binary: std::path::PathBuf::from(path),
+        origin,
+        version: Some(format!("openjdk version \"{major}.0.1\"")),
+        major: Some(major),
+        bits: 64,
+        vendor: None,
+    }
+}
+
+fn at_least(minimum: u32) -> JavaRequirement {
+    JavaRequirement::new(minimum, None, RequirementSource::Table)
+}
+
+#[test]
+fn scanned_paths_always_point_at_a_java_binary() {
+    // 本机可能一个都没有（裸机/容器）——那也算通过，只是列表为空。
+    for binary in discover::scan_java_binaries() {
+        assert!(
+            binary.is_file(),
+            "扫描结果必须是真实存在的文件：{}",
+            binary.display()
+        );
+        assert_eq!(
+            binary
+                .file_name()
+                .map(|name| name.to_string_lossy().into_owned()),
+            Some(unlucky_core::game::java::java_binary_name().to_string()),
+            "扫描结果必须是 bin/java[.exe]：{}",
+            binary.display()
+        );
+    }
+}
+
+#[test]
+fn standard_roots_are_absolute_and_unique() {
+    let roots = discover::standard_roots();
+    for root in &roots {
+        assert!(
+            root.is_absolute(),
+            "候选根必须是绝对路径：{}",
+            root.display()
+        );
+    }
+    let mut keys: Vec<String> = roots.iter().map(|root| discover::path_key(root)).collect();
+    let total = keys.len();
+    keys.sort();
+    keys.dedup();
+    assert_eq!(keys.len(), total, "候选根不该重复");
+}
+
+#[test]
+fn environment_java_beats_scanned_java_when_both_satisfy() {
+    // D13 的「优先级链不变」：环境变量是用户意图，扫盘只是候选。
+    let candidates = [
+        runtime(
+            "C:/Program Files/Eclipse Adoptium/jdk-21/bin/java.exe",
+            21,
+            JavaOrigin::System,
+        ),
+        runtime(
+            "C:/Program Files/Microsoft/jdk-21/bin/java.exe",
+            21,
+            JavaOrigin::JavaHome,
+        ),
+    ];
+    let picked = pick(&candidates, &at_least(17)).expect("应有候选");
+    assert_eq!(picked.origin, JavaOrigin::JavaHome);
+}
+
+#[test]
+fn scanned_java_is_still_used_when_nothing_else_matches() {
+    // MSI 装了 Temurin 21、没设环境变量、PATH 上是 Java 8：1.20.5 只认扫盘那个。
+    let candidates = [
+        runtime("java", 8, JavaOrigin::Path),
+        runtime(
+            "C:/Program Files/Java/jdk-21/bin/java.exe",
+            21,
+            JavaOrigin::System,
+        ),
+    ];
+    let picked = pick(&candidates, &at_least(21)).expect("应有候选");
+    assert_eq!(picked.origin, JavaOrigin::System);
+}
+
+#[test]
+fn dedupe_collapses_one_install_found_twice() {
+    // `JAVA_HOME` 指向 Program Files 里的 JDK → 同一个 java 不应列两次。
+    let candidates = discover::dedupe(vec![
+        runtime(
+            "C:/Program Files/Java/jdk-21/bin/java.exe",
+            21,
+            JavaOrigin::JavaHome,
+        ),
+        runtime(
+            "c:/program files/java/jdk-21/bin/java.exe",
+            21,
+            JavaOrigin::System,
+        ),
+    ]);
+    assert_eq!(candidates.len(), 1);
+    assert_eq!(candidates[0].origin, JavaOrigin::JavaHome);
+}
+
+#[test]
+fn registry_absence_is_tolerated() {
+    // 非 Windows 必然为空；Windows 上没装老 Oracle JDK 也是空。
+    let homes = discover::registry_homes();
+    for home in &homes {
+        assert!(
+            home.is_absolute(),
+            "注册表里的 JavaHome 应是绝对路径：{}",
+            home.display()
+        );
+    }
+}