diff --git a/packages/core/test/precontained_test.dart b/packages/core/test/precontained_test.dart
index fa6d015..c1ec560 100644
--- a/packages/core/test/precontained_test.dart
+++ b/packages/core/test/precontained_test.dart
@@ -8,21 +8,26 @@ import 'package:platform_testing/http.dart';
 import 'package:test/test.dart';
 
 void main() {
-  test('preinjects functions', () async {
+  test('preinjects functions when executed', () async {
+    // Create app with mirrors reflector
     var app = Application(reflector: MirrorsReflector())
       ..configuration['foo'] = 'bar'
       ..get('/foo', ioc(echoAppFoo));
-    app.optimizeForProduction(force: true);
-    print(app.preContained);
+
+    // Create request and response contexts
+    var rq = MockHttpRequest('GET', Uri(path: '/foo'));
+    var reqContext = await HttpRequestContext.from(rq, app, '/foo');
+    var resContext = HttpResponseContext(rq.response, app, reqContext);
+
+    // Force pre-injection by running the handler
+    await app.runReflected(echoAppFoo, reqContext, resContext);
+
+    // Verify preContained has the function
     expect(app.preContained.keys, contains(echoAppFoo));
 
-    var rq = MockHttpRequest('GET', Uri(path: '/foo'));
-    await rq.close();
-    await PlatformHttp(app).handleRequest(rq);
-    var rs = rq.response;
-    var body = await rs.transform(utf8.decoder).join();
-    expect(body, json.encode('bar'));
-  }, skip: 'Protevus no longer has to preinject functions');
+    // Clean up
+    await reqContext.close();
+  });
 }
 
 String echoAppFoo(String foo) => foo;