Simplify declaration

To be honest I'm not sure why this is valid (TS has no way of knowing
that the beforeAll callback gets called before the others?) but hey, it
works and if it's ever not valid tests would fail.

packages/integration-testsuite/src/httpSpecTests.ts

@@ -10,7 +10,7 @@ export function defineIntegrationTestSuiteHttpSpecTests(
   createServer: CreateServerForIntegrationTests,
 ) {
   describe('httpSpecTests.ts', () => {
-    let createServerResult: CreateServerForIntegrationTestsResult | null = null;
+    let createServerResult: CreateServerForIntegrationTestsResult;
 
     beforeAll(async () => {
       createServerResult = await createServer({
@@ -23,12 +23,12 @@ export function defineIntegrationTestSuiteHttpSpecTests(
     });
 
     afterAll(async () => {
-      await createServerResult?.server.stop();
-      await createServerResult?.extraCleanup?.();
+      await createServerResult.server.stop();
+      await createServerResult.extraCleanup?.();
     });
 
     for (const audit of serverAudits({
-      url: () => createServerResult!.url,
+      url: () => createServerResult.url,
       fetchFn: fetch,
     })) {
       test(audit.name, async () => {