add e2e tests to check for fetch proxy on versions 2.5.0 and ^2.16.0

Author: Lms24

dev-packages/e2e-tests/test-applications/sveltekit-2-twp/package.json

@@ -22,7 +22,7 @@
     "@sentry-internal/test-utils": "link:../../../test-utils",
     "@sentry/core": "latest || *",
     "@sveltejs/adapter-auto": "^3.0.0",
-    "@sveltejs/kit": "^2.0.0",
+    "@sveltejs/kit": "2.5.0",
     "@sveltejs/vite-plugin-svelte": "^3.0.0",
     "svelte": "^5.0.0-next.115",
     "svelte-check": "^3.6.0",

dev-packages/e2e-tests/test-applications/sveltekit-2-twp/tests/sdk.test.ts

@@ -0,0 +1,16 @@
+import { expect, test } from '@playwright/test';
+
+test.describe('SDK-internal behavior', () => {
+  test('Injects fetch proxy script for SvelteKit<2.16.0', async ({ page }) => {
+    await page.goto('/');
+
+    const sentryCarrier = await page.evaluate('typeof window.__SENTRY__');
+    const proxyHandle = await page.evaluate('typeof window._sentryFetchProxy');
+
+    // sanity check
+    expect(sentryCarrier).toBe('object');
+
+    // fetch proxy script ran
+    expect(proxyHandle).toBe('function');
+  });
+});

dev-packages/e2e-tests/test-applications/sveltekit-2/tests/sdk.test.ts

@@ -3,9 +3,14 @@ import { waitForInitialPageload } from './utils';
 
 test.describe('SDK-internal behavior', () => {
   test("Doesn't inject fetch proxy script for SvelteKit>=2.16.0", async ({ page }) => {
-    await waitForInitialPageload(page, { route: '/client-error' });
-    // @ts-expect-error - this is the variable the fetch proxy script sets if it would be injected
-    const proxyHandle = await page.waitForFunction(() => globalThis._sentryFetchProxy);
-    expect(proxyHandle).toBeUndefined();
+    await waitForInitialPageload(page, { route: '/' });
+    const sentryCarrier = await page.evaluate('typeof window.__SENTRY__');
+    const proxyHandle = await page.evaluate('typeof window._sentryFetchProxy');
+
+    // sanity check
+    expect(sentryCarrier).toBe('object');
+
+    // fetch proxy script didn't run
+    expect(proxyHandle).toBe('undefined');
   });
 });