test: use previewServer.close

refs cd3f085

Author: sapphi-red

test/tests.test.ts

@@ -105,17 +105,9 @@ describe('build', () => {
       beforeAll(async () => {
         await build(getConfig(configFile))
         server = await preview(getConfig(configFile))
-        // quickly timeout keep-alive to shutdown preview server faster
-        if ('keepAliveTimeout' in server.httpServer) {
-          server.httpServer.keepAliveTimeout = 1
-        }
       })
       afterAll(async () => {
-        await new Promise<void>((resolve) => {
-          server.httpServer.close(() => {
-            resolve()
-          })
-        })
+        await server.close()
       })
 
       for (const {