test: reduce noise from test warnings (#8251)

frontend/src/setupTests.ts

@@ -1,6 +1,7 @@
 import '@testing-library/jest-dom';
 import 'whatwg-fetch';
 import 'regenerator-runtime';
+import { beforeAll, vi } from 'vitest';
 
 class ResizeObserver {
     observe() {}
@@ -13,3 +14,20 @@ if (!window.ResizeObserver) {
 }
 
 process.env.TZ = 'UTC';
+
+// ignore known React warnings
+const consoleError = console.error;
+beforeAll(() => {
+    vi.spyOn(console, 'error').mockImplementation((...args) => {
+        if (
+            !(
+                typeof args[0] === 'string' &&
+                args[0].includes(
+                    'Warning: An update to %s inside a test was not wrapped in act',
+                )
+            )
+        ) {
+            consoleError(...args);
+        }
+    });
+});

frontend/src/utils/testServer.ts

@@ -4,7 +4,13 @@ import { http, HttpResponse } from 'msw';
 export const testServerSetup = (): SetupServer => {
     const server = setupServer();
 
-    beforeAll(() => server.listen());
+    beforeAll(() =>
+        server.listen({
+            onUnhandledRequest() {
+                return HttpResponse.error();
+            },
+        }),
+    );
     afterAll(() => server.close());
     afterEach(() => server.resetHandlers());