test(core): add comprehensive unit tests for config module

src/core/config.test.ts

@@ -0,0 +1,82 @@
+import { describe, it, expect } from "vitest";
+import * as path from "path";
+import * as os from "os";
+import {
+  CLAUDE_DIR,
+  HISTORY_FILE,
+  PROJECTS_DIR,
+  SESSIONS_DIR,
+  STATE_FILE,
+  STATS_CACHE_FILE,
+  SETTINGS_FILE,
+  MCP_AUTH_CACHE_FILE,
+  SESSION_META_READ_BYTES,
+  SETTINGS_SNAPSHOTS_DIR,
+  CLAUDE_MANAGER_DIR,
+  STATUSLINE_CACHE_FILE,
+  STATUSLINE_TAP_FILE,
+  STATUSLINE_INNER_FILE,
+  SESSION_TAP_FILE,
+  SESSION_ACTIVE_FILE,
+} from "./config";
+
+describe("config", () => {
+  describe("paths", () => {
+    it("should define CLAUDE_DIR as ~/.claude", () => {
+      const expected = path.join(os.homedir(), ".claude");
+      expect(CLAUDE_DIR).toBe(expected);
+    });
+
+    it("should define HISTORY_FILE under CLAUDE_DIR", () => {
+      expect(HISTORY_FILE).toContain(".claude");
+      expect(HISTORY_FILE).toContain("history.jsonl");
+    });
+
+    it("should define PROJECTS_DIR for session files", () => {
+      expect(PROJECTS_DIR).toContain(".claude");
+      expect(PROJECTS_DIR).toContain("projects");
+    });
+
+    it("should define SESSIONS_DIR for session metadata", () => {
+      expect(SESSIONS_DIR).toContain(".claude");
+      expect(SESSIONS_DIR).toContain("sessions");
+    });
+
+    it("should define STATE_FILE for extension state", () => {
+      expect(STATE_FILE).toContain(".csm-state.json");
+      expect(STATE_FILE).toContain(".claude");
+    });
+
+    it("should define CLAUDE_MANAGER_DIR for extension state", () => {
+      expect(CLAUDE_MANAGER_DIR).toContain(".claude-manager");
+    });
+  });
+
+  describe("constants", () => {
+    it("should define SESSION_META_READ_BYTES", () => {
+      expect(SESSION_META_READ_BYTES).toBe(4096);
+      expect(SESSION_META_READ_BYTES).toBeGreaterThan(0);
+    });
+
+    it("should define all paths as strings", () => {
+      expect(typeof CLAUDE_DIR).toBe("string");
+      expect(typeof HISTORY_FILE).toBe("string");
+    });
+  });
+
+  describe("path consistency", () => {
+    it("all .claude paths should be under CLAUDE_DIR", () => {
+      const underClaude = [
+        HISTORY_FILE,
+        PROJECTS_DIR,
+        SESSIONS_DIR,
+        STATE_FILE,
+        SETTINGS_FILE,
+      ];
+
+      underClaude.forEach((filePath) => {
+        expect(filePath.startsWith(CLAUDE_DIR)).toBe(true);
+      });
+    });
+  });
+});