Fix a bug with the implementation of LiveSuite.

lib/src/runner/engine.dart

Index: lib/src/runner/engine.dart
diff --git a/lib/src/runner/engine.dart b/lib/src/runner/engine.dart
index 62a6db5b2f94ab3124b27f3c08e1c2f1fa0b5347..54c312d02d0669934cfd342fe0bef6274fa0ffb2 100644
--- a/lib/src/runner/engine.dart
+++ b/lib/src/runner/engine.dart
@@ -254,6 +254,7 @@ class Engine {
         await _runPool.withResource(() async {
           if (_closed) return;
           await _runGroup(controller, controller.liveSuite.suite.group, []);
+          controller.noMoreLiveTests();
           loadResource.allowRelease(() => controller.close());
         });
       }));