test(nuxt): Unit tests for event filter (#13229)

Adding more convenient unit test. There is already an E2E test for this:
https://github.com/getsentry/sentry-javascript/blob/b6cf7b0cabc27a84e962f0a1e408465cc87fd961/dev-packages/e2e-tests/test-applications/nuxt-3/tests/performance.server.test.ts#L24

Also moved two files in the `test` folder to resemble the `src` folder

Author: s1gr1d

packages/nuxt/test/server/runtime/plugin.test.ts renamed to packages/nuxt/test/runtime/plugins/server.test.ts

@@ -1,5 +1,5 @@
 import { describe, expect, it } from 'vitest';
-import { extractErrorContext } from '../../../src/runtime/utils';
+import { extractErrorContext } from '../../src/runtime/utils';
 
 describe('extractErrorContext', () => {
   it('returns empty object for undefined or empty context', () => {

packages/nuxt/test/client/runtime/utils.test.ts renamed to packages/nuxt/test/runtime/utils.test.ts

@@ -1,4 +1,5 @@
 import * as SentryNode from '@sentry/node';
+import type { NodeClient } from '@sentry/node';
 import { SDK_VERSION } from '@sentry/node';
 import { beforeEach, describe, expect, it, vi } from 'vitest';
 import { init } from '../../src/server';
@@ -38,5 +39,47 @@ describe('Nuxt Server SDK', () => {
     it('returns client from init', () => {
       expect(init({})).not.toBeUndefined();
     });
+
+    it('filters out low quality transactions', async () => {
+      const beforeSendEvent = vi.fn(event => event);
+      const client = init({
+        dsn: 'https://[email protected]/1337',
+      }) as NodeClient;
+      client.on('beforeSendEvent', beforeSendEvent);
+
+      client.captureEvent({ type: 'transaction', transaction: 'GET /' });
+      client.captureEvent({ type: 'transaction', transaction: 'GET /_nuxt/some_asset.js' });
+      // Although this has the name of the build asset directory (_nuxt), it should not be filtered out as it would not match the regex
+      client.captureEvent({ type: 'transaction', transaction: 'GET _nuxt/some_asset.js' });
+      client.captureEvent({ type: 'transaction', transaction: 'POST /_server' });
+
+      await client!.flush();
+
+      expect(beforeSendEvent).toHaveBeenCalledTimes(3);
+      expect(beforeSendEvent).toHaveBeenCalledWith(
+        expect.objectContaining({
+          transaction: 'GET /',
+        }),
+        expect.any(Object),
+      );
+      expect(beforeSendEvent).toHaveBeenCalledWith(
+        expect.objectContaining({
+          transaction: 'GET _nuxt/some_asset.js',
+        }),
+        expect.any(Object),
+      );
+      expect(beforeSendEvent).not.toHaveBeenCalledWith(
+        expect.objectContaining({
+          transaction: 'GET /_nuxt/some_asset.js',
+        }),
+        expect.any(Object),
+      );
+      expect(beforeSendEvent).toHaveBeenCalledWith(
+        expect.objectContaining({
+          transaction: 'POST /_server',
+        }),
+        expect.any(Object),
+      );
+    });
   });
 });