Add unit tests for git persistence

src/db.test.ts

@@ -14,6 +14,7 @@ import {
   initDb,
   respondToPrompt,
   updateLastSeen,
+  updateSessionStats,
 } from "./db";
 
 beforeEach(() => {
@@ -280,3 +281,61 @@ test("getSessionOutput only returns output for specific session", () => {
   expect(output1[0]?.line).toBe("Session 1 output");
   expect(output2[0]?.line).toBe("Session 2 output");
 });
+
+// Git persistence tests
+
+test("updateSessionStats persists git branch and files", () => {
+  const device = createDevice("secret123");
+  const session = createSession(device.id);
+
+  updateSessionStats(session.id, {
+    state: "ready",
+    prompts: 0,
+    completions: 0,
+    tools: 0,
+    compressions: 0,
+    thinking_seconds: 0,
+    work_seconds: 0,
+    mode: "normal",
+    model: null,
+    idle_since: null,
+    git_branch: "feature/test",
+    git_files_json: JSON.stringify([
+      { path: "src/test.ts", status: "M", additions: 5, deletions: 2 },
+    ]),
+  });
+
+  const updated = getSession(session.id);
+  expect(updated?.git_branch).toBe("feature/test");
+
+  const files = JSON.parse(updated?.git_files_json || "[]");
+  expect(files).toHaveLength(1);
+  expect(files[0].path).toBe("src/test.ts");
+  expect(files[0].status).toBe("M");
+  expect(files[0].additions).toBe(5);
+  expect(files[0].deletions).toBe(2);
+});
+
+test("updateSessionStats handles null git data", () => {
+  const device = createDevice("secret123");
+  const session = createSession(device.id);
+
+  updateSessionStats(session.id, {
+    state: "ready",
+    prompts: 1,
+    completions: 1,
+    tools: 1,
+    compressions: 0,
+    thinking_seconds: 10,
+    work_seconds: 30,
+    mode: "normal",
+    model: "claude-sonnet",
+    idle_since: Date.now(),
+    git_branch: null,
+    git_files_json: null,
+  });
+
+  const updated = getSession(session.id);
+  expect(updated?.git_branch).toBeNull();
+  expect(updated?.git_files_json).toBeNull();
+});