rust部分推进：进程间通信（Windows平台命名管线）、内存页表、B+树、WAL恢复系统、动态配置

chusql-storage/tests/config_test.rs

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+use std::path::PathBuf;
+
+use chusql_storage::config::{
+    self, Config, DEFAULT_BTREE_ORDER, DEFAULT_DATA_DIR, DEFAULT_PAGE_SIZE, DEFAULT_PIPE_NAME,
+    Origin,
+};
+use chusql_storage::log::Level;
+
+// 配置测试：没有文件时全默认、文件里写了才覆盖、环境变量优先于文件、
+// 非法值 / 未知键要报错、每个选项的来源都记得下来。
+
+/// 没有配置文件、没有环境变量：全部走内置默认值。
+#[test]
+fn defaults_without_file() {
+    let loaded = config::resolve(None, None, &|_| None).unwrap();
+    assert_eq!(loaded.config, Config::default());
+    assert!(loaded.config_path.is_none());
+    assert!(loaded.origins.iter().all(|(_, _, o)| *o == Origin::Default));
+    assert_eq!(loaded.config.page_size, DEFAULT_PAGE_SIZE);
+    assert_eq!(loaded.config.btree_order, DEFAULT_BTREE_ORDER);
+    assert_eq!(loaded.config.data_dir, PathBuf::from(DEFAULT_DATA_DIR));
+    assert_eq!(loaded.config.pipe_name, DEFAULT_PIPE_NAME);
+    assert_eq!(loaded.config.log_level, Level::Info);
+}
+
+/// 文件里只写了一项：这一项生效，其余回退默认（并且来源记得清清楚楚）。
+#[test]
+fn file_overrides_only_written_keys() {
+    let path = PathBuf::from("t.toml");
+    let loaded = config::resolve(Some("[page]\nsize = 8192\n"), Some(path.clone()), &|_| None)
+        .unwrap();
+
+    assert_eq!(loaded.config.page_size, 8192);
+    assert_eq!(loaded.config.btree_order, DEFAULT_BTREE_ORDER);
+    assert_eq!(loaded.config.data_dir, PathBuf::from(DEFAULT_DATA_DIR));
+    assert_eq!(loaded.config_path, Some(path.clone()));
+
+    let page = loaded.origins.iter().find(|(n, _, _)| *n == "page.size").unwrap();
+    assert_eq!(page.2, Origin::File(path));
+    let order = loaded.origins.iter().find(|(n, _, _)| *n == "btree.order").unwrap();
+    assert_eq!(order.2, Origin::Default);
+}
+
+/// 五项全写：值都生效，来源都是文件。
+#[test]
+fn file_all_keys() {
+    let text = "[page]\nsize = 8192\n[btree]\norder = 32\n[storage]\ndata_dir = \"mydata\"\n[server]\npipe_name = \"mypipe\"\n[log]\nlevel = \"debug\"\n";
+    let path = PathBuf::from("t.toml");
+    let loaded = config::resolve(Some(text), Some(path.clone()), &|_| None).unwrap();
+
+    assert_eq!(loaded.config.page_size, 8192);
+    assert_eq!(loaded.config.btree_order, 32);
+    assert_eq!(loaded.config.data_dir, PathBuf::from("mydata"));
+    assert_eq!(loaded.config.pipe_name, "mypipe");
+    assert_eq!(loaded.config.log_level, Level::Debug);
+    assert!(
+        loaded
+            .origins
+            .iter()
+            .all(|(_, _, o)| *o == Origin::File(path.clone()))
+    );
+}
+
+/// 环境变量优先于文件。
+#[test]
+fn env_beats_file() {
+    let text = "[storage]\ndata_dir = \"from-file\"\n";
+    let env = |k: &str| (k == "CHUSQL_DATA_DIR").then(|| "from-env".to_string());
+    let loaded = config::resolve(Some(text), Some(PathBuf::from("t.toml")), &env).unwrap();
+
+    assert_eq!(loaded.config.data_dir, PathBuf::from("from-env"));
+    let dir = loaded
+        .origins
+        .iter()
+        .find(|(n, _, _)| *n == "storage.data_dir")
+        .unwrap();
+    assert_eq!(dir.2, Origin::Env("CHUSQL_DATA_DIR"));
+}
+
+/// 日志等级写错要报错，而不是悄悄按默认跑。
+#[test]
+fn rejects_bad_log_level() {
+    let err = config::resolve(Some("[log]\nlevel = \"loud\"\n"), None, &|_| None).unwrap_err();
+    assert!(err.contains("log.level"), "got {}", err);
+}
+
+/// 页大小必须是 512..65536 之间的 2 的幂。
+#[test]
+fn rejects_bad_page_size() {
+    let err = config::resolve(Some("[page]\nsize = 3000\n"), None, &|_| None).unwrap_err();
+    assert!(err.contains("page.size"), "got {}", err);
+
+    let err = config::resolve(Some("[page]\nsize = 128\n"), None, &|_| None).unwrap_err();
+    assert!(err.contains("page.size"), "got {}", err);
+}
+
+/// order 太小、或者放不进一页，都要报错。
+#[test]
+fn rejects_bad_btree_order() {
+    let err = config::resolve(Some("[btree]\norder = 2\n"), None, &|_| None).unwrap_err();
+    assert!(err.contains("btree.order"), "got {}", err);
+
+    let err = config::resolve(Some("[btree]\norder = 300\n"), None, &|_| None).unwrap_err();
+    assert!(err.contains("does not fit"), "got {}", err);
+}
+
+/// 配置里出现认不出来的键要报错（拼错了不能当没看见）。
+#[test]
+fn rejects_unknown_key() {
+    let err = config::resolve(Some("[page]\nsizes = 4096\n"), None, &|_| None).unwrap_err();
+    assert!(err.contains("bad config"), "got {}", err);
+}
+
+/// 环境变量给了非法值也要报错。
+#[test]
+fn rejects_bad_env_value() {
+    let env = |k: &str| (k == "CHUSQL_PAGE_SIZE").then(|| "big".to_string());
+    let err = config::resolve(None, None, &env).unwrap_err();
+    assert!(err.contains("CHUSQL_PAGE_SIZE"), "got {}", err);
+}
+
+/// 来源文案要能说清"哪来的"。
+#[test]
+fn origin_description() {
+    assert_eq!(Origin::Default.describe(), "default");
+    assert_eq!(Origin::Env("CHUSQL_PIPE").describe(), "env CHUSQL_PIPE");
+    assert_eq!(
+        Origin::File(PathBuf::from("a.toml")).describe(),
+        format!("file {}", PathBuf::from("a.toml").display())
+    );
+}