refactor: 리펙토링

tests/unit/cross-tab-invalidation.test.ts

@@ -9,6 +9,7 @@ import {
 } from "../../src/contracts/cache-invalidation.ts";
 import {
   createBrowserCrossContextInvalidation,
+  createBrowserCrossContextInvalidationFromHost,
   type BroadcastChannelFacade,
   type BroadcastMessageListener,
   type BrowserCrossContextInvalidationDependencies,
@@ -21,7 +22,7 @@ import {
 
 const NOW = 1_000_000;
 const CACHE_EPOCH = "cache-epoch-0001";
-const TOPIC = "reference-resources";
+const TOPIC = "sample-topic-alpha";
 const CHANNEL_NAME = "cache-invalidation-v1";
 const STORAGE_PULSE_KEY = "ca-frontend:cache-invalidation:v1:pulse";
 
@@ -307,6 +308,30 @@ describe("cache invalidation wire contract", () => {
   });
 });
 
+describe("browser cross-context host", () => {
+  it("does not inspect browser capabilities when no topic is installed", () => {
+    const reads: string[] = [];
+    const host = new Proxy<Record<string, unknown>>(
+      {},
+      {
+        get(_target, property) {
+          reads.push(String(property));
+          throw new DOMException("Capability access denied", "SecurityError");
+        },
+      },
+    );
+
+    expect(
+      createBrowserCrossContextInvalidationFromHost({
+        host,
+        cacheEpoch: CACHE_EPOCH,
+        topics: [],
+      }),
+    ).toBeUndefined();
+    expect(reads).toEqual([]);
+  });
+});
+
 describe("browser cross-context invalidation transport", () => {
   it("publishes one exact BroadcastChannel event and filters self echo", () => {
     const network = new FakeBroadcastNetwork();
@@ -525,7 +550,7 @@ describe("browser cross-context invalidation transport", () => {
       true,
     );
     expect(JSON.stringify(observations)).not.toMatch(
-      /sensitive-event-identifier|reference-resources|cache-epoch-0001/,
+      /sensitive-event-identifier|sample-topic-alpha|cache-epoch-0001/,
     );
     runtime.close();
   });