feat(e2e): add test mode infrastructure with BTERMINAL_TEST env isolation

Rust: watcher.rs/fs_watcher.rs skip watchers in test mode,
is_test_mode Tauri command. Frontend: wake-scheduler disable,
App.svelte test mode detection. AppConfig centralization in
bterminal-core (OnceLock pattern for path overrides).

v2/bterminal-core/Cargo.toml

@@ -11,3 +11,4 @@ serde_json = "1.0"
 log = "0.4"
 portable-pty = "0.8"
 uuid = { version = "1", features = ["v4"] }
+dirs = "5"

v2/bterminal-core/src/config.rs

@@ -0,0 +1,193 @@
+// AppConfig — centralized path resolution for all BTerminal subsystems.
+// In production, paths resolve via dirs:: crate defaults.
+// In test mode (BTERMINAL_TEST=1), paths resolve from env var overrides:
+//   BTERMINAL_TEST_DATA_DIR   → replaces dirs::data_dir()/bterminal
+//   BTERMINAL_TEST_CONFIG_DIR → replaces dirs::config_dir()/bterminal
+//   BTERMINAL_TEST_CTX_DIR    → replaces ~/.claude-context
+
+use std::path::PathBuf;
+
+#[derive(Debug, Clone)]
+pub struct AppConfig {
+    /// Data directory for btmsg.db, sessions.db (default: ~/.local/share/bterminal)
+    pub data_dir: PathBuf,
+    /// Config directory for groups.json (default: ~/.config/bterminal)
+    pub config_dir: PathBuf,
+    /// ctx database path (default: ~/.claude-context/context.db)
+    pub ctx_db_path: PathBuf,
+    /// Memora database path (default: ~/.local/share/memora/memories.db)
+    pub memora_db_path: PathBuf,
+    /// Whether we are in test mode
+    pub test_mode: bool,
+}
+
+impl AppConfig {
+    /// Build config from environment. In test mode, uses BTERMINAL_TEST_*_DIR env vars.
+    pub fn from_env() -> Self {
+        let test_mode = std::env::var("BTERMINAL_TEST").map_or(false, |v| v == "1");
+
+        let data_dir = std::env::var("BTERMINAL_TEST_DATA_DIR")
+            .ok()
+            .filter(|_| test_mode)
+            .map(PathBuf::from)
+            .unwrap_or_else(|| {
+                dirs::data_dir()
+                    .unwrap_or_else(|| PathBuf::from("."))
+                    .join("bterminal")
+            });
+
+        let config_dir = std::env::var("BTERMINAL_TEST_CONFIG_DIR")
+            .ok()
+            .filter(|_| test_mode)
+            .map(PathBuf::from)
+            .unwrap_or_else(|| {
+                dirs::config_dir()
+                    .unwrap_or_else(|| PathBuf::from("."))
+                    .join("bterminal")
+            });
+
+        let ctx_db_path = std::env::var("BTERMINAL_TEST_CTX_DIR")
+            .ok()
+            .filter(|_| test_mode)
+            .map(|d| PathBuf::from(d).join("context.db"))
+            .unwrap_or_else(|| {
+                dirs::home_dir()
+                    .unwrap_or_default()
+                    .join(".claude-context")
+                    .join("context.db")
+            });
+
+        let memora_db_path = if test_mode {
+            // In test mode, memora is optional — use data_dir/memora/memories.db
+            data_dir.join("memora").join("memories.db")
+        } else {
+            dirs::data_dir()
+                .unwrap_or_else(|| {
+                    dirs::home_dir()
+                        .unwrap_or_default()
+                        .join(".local/share")
+                })
+                .join("memora")
+                .join("memories.db")
+        };
+
+        Self {
+            data_dir,
+            config_dir,
+            ctx_db_path,
+            memora_db_path,
+            test_mode,
+        }
+    }
+
+    /// Path to btmsg.db (shared between btmsg and bttask)
+    pub fn btmsg_db_path(&self) -> PathBuf {
+        self.data_dir.join("btmsg.db")
+    }
+
+    /// Path to sessions.db
+    pub fn sessions_db_dir(&self) -> &PathBuf {
+        &self.data_dir
+    }
+
+    /// Path to groups.json
+    pub fn groups_json_path(&self) -> PathBuf {
+        self.config_dir.join("groups.json")
+    }
+
+    /// Whether running in test mode (BTERMINAL_TEST=1)
+    pub fn is_test_mode(&self) -> bool {
+        self.test_mode
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_production_paths_use_dirs() {
+        // Without BTERMINAL_TEST=1, paths should use dirs:: defaults
+        std::env::remove_var("BTERMINAL_TEST");
+        std::env::remove_var("BTERMINAL_TEST_DATA_DIR");
+        std::env::remove_var("BTERMINAL_TEST_CONFIG_DIR");
+        std::env::remove_var("BTERMINAL_TEST_CTX_DIR");
+
+        let config = AppConfig::from_env();
+        assert!(!config.is_test_mode());
+        // Should end with "bterminal" for data and config
+        assert!(config.data_dir.ends_with("bterminal"));
+        assert!(config.config_dir.ends_with("bterminal"));
+        assert!(config.ctx_db_path.ends_with("context.db"));
+        assert!(config.memora_db_path.ends_with("memories.db"));
+    }
+
+    #[test]
+    fn test_btmsg_db_path() {
+        std::env::remove_var("BTERMINAL_TEST");
+        let config = AppConfig::from_env();
+        let path = config.btmsg_db_path();
+        assert!(path.ends_with("btmsg.db"));
+        assert!(path.parent().unwrap().ends_with("bterminal"));
+    }
+
+    #[test]
+    fn test_groups_json_path() {
+        std::env::remove_var("BTERMINAL_TEST");
+        let config = AppConfig::from_env();
+        let path = config.groups_json_path();
+        assert!(path.ends_with("groups.json"));
+    }
+
+    #[test]
+    fn test_test_mode_uses_overrides() {
+        std::env::set_var("BTERMINAL_TEST", "1");
+        std::env::set_var("BTERMINAL_TEST_DATA_DIR", "/tmp/bt-test-data");
+        std::env::set_var("BTERMINAL_TEST_CONFIG_DIR", "/tmp/bt-test-config");
+        std::env::set_var("BTERMINAL_TEST_CTX_DIR", "/tmp/bt-test-ctx");
+
+        let config = AppConfig::from_env();
+        assert!(config.is_test_mode());
+        assert_eq!(config.data_dir, PathBuf::from("/tmp/bt-test-data"));
+        assert_eq!(config.config_dir, PathBuf::from("/tmp/bt-test-config"));
+        assert_eq!(config.ctx_db_path, PathBuf::from("/tmp/bt-test-ctx/context.db"));
+        assert_eq!(config.btmsg_db_path(), PathBuf::from("/tmp/bt-test-data/btmsg.db"));
+        assert_eq!(config.groups_json_path(), PathBuf::from("/tmp/bt-test-config/groups.json"));
+
+        // Cleanup
+        std::env::remove_var("BTERMINAL_TEST");
+        std::env::remove_var("BTERMINAL_TEST_DATA_DIR");
+        std::env::remove_var("BTERMINAL_TEST_CONFIG_DIR");
+        std::env::remove_var("BTERMINAL_TEST_CTX_DIR");
+    }
+
+    #[test]
+    fn test_test_mode_without_overrides_uses_defaults() {
+        std::env::set_var("BTERMINAL_TEST", "1");
+        std::env::remove_var("BTERMINAL_TEST_DATA_DIR");
+        std::env::remove_var("BTERMINAL_TEST_CONFIG_DIR");
+        std::env::remove_var("BTERMINAL_TEST_CTX_DIR");
+
+        let config = AppConfig::from_env();
+        assert!(config.is_test_mode());
+        // Without override vars, falls back to dirs:: defaults
+        assert!(config.data_dir.ends_with("bterminal"));
+
+        std::env::remove_var("BTERMINAL_TEST");
+    }
+
+    #[test]
+    fn test_test_mode_memora_in_data_dir() {
+        std::env::set_var("BTERMINAL_TEST", "1");
+        std::env::set_var("BTERMINAL_TEST_DATA_DIR", "/tmp/bt-test-data");
+
+        let config = AppConfig::from_env();
+        assert_eq!(
+            config.memora_db_path,
+            PathBuf::from("/tmp/bt-test-data/memora/memories.db")
+        );
+
+        std::env::remove_var("BTERMINAL_TEST");
+        std::env::remove_var("BTERMINAL_TEST_DATA_DIR");
+    }
+}

v2/bterminal-core/src/lib.rs

@@ -1,3 +1,4 @@
+pub mod config;
 pub mod event;
 pub mod pty;
 pub mod sidecar;

v2/bterminal-core/src/sidecar.rs

@@ -44,6 +44,8 @@ fn default_provider() -> String {
 #[derive(Debug, Clone)]
 pub struct SidecarConfig {
     pub search_paths: Vec<PathBuf>,
+    /// Extra env vars forwarded to sidecar processes (e.g. BTERMINAL_TEST=1 for test isolation)
+    pub env_overrides: std::collections::HashMap<String, String>,
 }
 
 struct SidecarCommand {
@@ -94,6 +96,7 @@ impl SidecarManager {
             .args(&cmd.args)
             .env_clear()
             .envs(clean_env)
+            .envs(self.config.env_overrides.iter().map(|(k, v)| (k.as_str(), v.as_str())))
             .stdin(Stdio::piped())
             .stdout(Stdio::piped())
             .stderr(Stdio::piped())