test(node): Add test to show how re-init works (#12016)

Just a test showing how stuff behaves if:

1. `init` is called without DSN
2. `httpIntegration` is manually added
3. `init` is called again, later, with DSN

---------

Co-authored-by: Andrei <[email protected]>

Author: mydea

dev-packages/node-integration-tests/suites/express/multiple-init/server.ts

@@ -0,0 +1,60 @@
+import { loggingTransport } from '@sentry-internal/node-integration-tests';
+import * as Sentry from '@sentry/node';
+
+Sentry.init({
+  // No dsn, means  client is disabled
+  // dsn: 'https://[email protected]/1337',
+  release: '1.0',
+  transport: loggingTransport,
+});
+
+// We add http integration to ensure request isolation etc. works
+const initialClient = Sentry.getClient();
+initialClient?.addIntegration(Sentry.httpIntegration());
+
+// Store this so we can update the client later
+const initialCurrentScope = Sentry.getCurrentScope();
+
+import { startExpressServerAndSendPortToRunner } from '@sentry-internal/node-integration-tests';
+import express from 'express';
+
+const app = express();
+
+Sentry.setTag('global', 'tag');
+
+app.get('/test/no-init', (_req, res) => {
+  Sentry.addBreadcrumb({ message: 'no init breadcrumb' });
+  Sentry.setTag('no-init', 'tag');
+
+  res.send({});
+});
+
+app.get('/test/init', (_req, res) => {
+  // Call init again, but with DSN
+  Sentry.init({
+    dsn: 'https://[email protected]/1337',
+    release: '1.0',
+    transport: loggingTransport,
+  });
+  // Set this on initial scope, to ensure it can be inherited
+  initialCurrentScope.setClient(Sentry.getClient()!);
+
+  Sentry.addBreadcrumb({ message: 'init breadcrumb' });
+  Sentry.setTag('init', 'tag');
+
+  res.send({});
+});
+
+app.get('/test/error/:id', (req, res) => {
+  const id = req.params.id;
+  Sentry.addBreadcrumb({ message: `error breadcrumb ${id}` });
+  Sentry.setTag('error', id);
+
+  Sentry.captureException(new Error(`This is an exception ${id}`));
+
+  res.send({});
+});
+
+Sentry.setupExpressErrorHandler(app);
+
+startExpressServerAndSendPortToRunner(app);

dev-packages/node-integration-tests/suites/express/multiple-init/test.ts

@@ -0,0 +1,60 @@
+import { cleanupChildProcesses, createRunner } from '../../../utils/runner';
+
+afterAll(() => {
+  cleanupChildProcesses();
+});
+
+test('allows to call init multiple times', done => {
+  const runner = createRunner(__dirname, 'server.ts')
+    .ignore('session', 'sessions')
+    .expect({
+      event: {
+        exception: {
+          values: [
+            {
+              value: 'This is an exception 2',
+            },
+          ],
+        },
+        breadcrumbs: [
+          {
+            message: 'error breadcrumb 2',
+            timestamp: expect.any(Number),
+          },
+        ],
+        tags: {
+          global: 'tag',
+          error: '2',
+        },
+      },
+    })
+    .expect({
+      event: {
+        exception: {
+          values: [
+            {
+              value: 'This is an exception 3',
+            },
+          ],
+        },
+        breadcrumbs: [
+          {
+            message: 'error breadcrumb 3',
+            timestamp: expect.any(Number),
+          },
+        ],
+        tags: {
+          global: 'tag',
+          error: '3',
+        },
+      },
+    })
+    .start(done);
+
+  runner
+    .makeRequest('get', '/test/no-init')
+    .then(() => runner.makeRequest('get', '/test/error/1'))
+    .then(() => runner.makeRequest('get', '/test/init'))
+    .then(() => runner.makeRequest('get', '/test/error/2'))
+    .then(() => runner.makeRequest('get', '/test/error/3'));
+});