1 files changed, 61 insertions, 0 deletions
diff --git a/test-suite/unit/shared-window.test.mjs b/test-suite/unit/shared-window.test.mjs
new file mode 100644
index 0000000..66041f4
--- /dev/null
+++ b/test-suite/unit/shared-window.test.mjs
@@ -0,0 +1,61 @@
+// Each session has its own window: a window shows only one tab, so sessions sharing one hid each
+// other's tabs (no real input, blank screenshots). A session's extra tabs go into its own window.
+import assert from "node:assert/strict";
+import fs from "node:fs";
+import vm from "node:vm";
+import { test } from "node:test";
+
+const workerSource = fs.readFileSync(new URL("../../extensions/chrome-profile-bridge/browser-extension/service_worker.js", import.meta.url), "utf8");
+
+function worker({ groups = [], windows = { 5: { id: 5, type: "normal" } } } = {}) {
+  const calls = [];
+  const listener = { addListener() {}, removeListener() {} };
+  let nextTab = 100;
+  const w = {
+    console, setTimeout, clearTimeout, setInterval: () => 0, navigator: { userAgent: "unit-test" }, fetch: async () => { throw new Error("offline"); },
+    chrome: {
+      runtime: { id: "test", getManifest: () => ({ version: "0.0.0" }), onInstalled: listener, onStartup: listener },
+      alarms: { create() {}, onAlarm: listener }, action: { onClicked: listener }, webNavigation: { onCommitted: listener },
+      debugger: { onDetach: listener, onEvent: listener, getTargets: (cb) => cb([]) },
+      storage: { session: { get: async () => ({}), set: async (v) => { calls.push({ method: 'storage.set', json: JSON.stringify(v) }); } } },
+      tabGroups: { query: async () => groups },
+      windows: {
+        get: async (id) => windows[id] ?? Promise.reject(new Error("No window")),
+        create: async (props) => { calls.push({ method: "windows.create", props }); return { id: 9, tabs: [{ id: 900, windowId: 9 }] }; },
+      },
+      tabs: {
+        create: async (props) => { calls.push({ method: "tabs.create", props }); return { id: nextTab++, windowId: props.windowId }; },
+        query: async () => [], get: async () => null, onUpdated: listener,
+      },
+    },
+  };
+  w.self = w;
+  vm.runInNewContext(workerSource, w);
+  return { w, calls };
+}
+
+const piGroup = (windowId, name = "Pi Session: claude-code 1 other") => ({ id: 1, windowId, title: name });
+const ops = (calls) => calls.filter((c) => c.method !== "storage.set").map((c) => c.method);
+
+test("a new session gets its own window even when another session's window exists", async () => {
+  const { w, calls } = worker({ groups: [piGroup(5)] });
+  await w.createAutomationTarget("claude-code 2 mine", "Pi Session: claude-code 2 mine");
+  assert.deepEqual(ops(calls), ["windows.create"]);
+});
+
+test("a session that already has a group adds its tab to that group's window", async () => {
+  const { w, calls } = worker({ groups: [piGroup(5, "Pi Session: claude-code 2 mine")] });
+  await w.createAutomationTarget("claude-code 2 mine", "Pi Session: claude-code 2 mine");
+  assert.deepEqual(ops(calls), ["tabs.create"]);
+  assert.equal(calls.find((c) => c.method === "tabs.create").props.windowId, 5);
+});
+
+test("chrome_tab new for a session with no group goes to the session's own window, not the focused one", async () => {
+  const { w, calls } = worker({ groups: [piGroup(5)] });
+  w.groupTab = async (tab) => tab;
+  w.bringToFront = async () => {};
+  await w.dispatch("tab.new", { url: "https://x.test/", groupTitle: "Pi Session: claude-code 2 mine", sessionKey: "claude-code 2 mine" });
+  assert.deepEqual(ops(calls), ["windows.create"]);
+  assert.equal(calls[0].props.url, "https://x.test/");
+  assert.equal(calls[0].props.focused, false);
+});