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frontend/tests/providerRecentRequestsIsolation.test.ts

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+import { describe, expect, test } from 'vitest';
+import { createProviderRecentRequestsCacheController } from '../src/components/providers/hooks/useProviderRecentRequests';
+
+describe('provider recent request cache isolation', () => {
+  test('creates a fresh cache when the backend or management key changes', () => {
+    const controller = createProviderRecentRequestsCacheController();
+    const serverA = controller.forScope('https://server-a.example', 'key-a');
+    serverA.cachedUsageByProvider = new Map([['provider-a', new Map()]]);
+    serverA.cachedAt = Date.now();
+    serverA.inFlightRequest = Promise.resolve(serverA.cachedUsageByProvider);
+
+    const serverB = controller.forScope('https://server-b.example', 'key-b');
+
+    expect(serverB).not.toBe(serverA);
+    expect(serverB.cachedUsageByProvider.size).toBe(0);
+    expect(serverB.cachedAt).toBe(0);
+    expect(serverB.inFlightRequest).toBeNull();
+
+    serverA.cachedUsageByProvider = new Map([['late-provider-a', new Map()]]);
+    expect(controller.forScope('https://server-b.example', 'key-b')).toBe(serverB);
+    expect(serverB.cachedUsageByProvider.size).toBe(0);
+  });
+
+  test('reuses the cache only within the same connection scope', () => {
+    const controller = createProviderRecentRequestsCacheController();
+    const first = controller.forScope('https://server.example', 'key-a');
+
+    expect(controller.forScope('https://server.example', 'key-a')).toBe(first);
+    expect(controller.forScope('https://server.example', 'key-b')).not.toBe(first);
+  });
+});