Update

Author: dantleech

bin/serve.php

@@ -106,10 +106,10 @@ function (MessageTransmitter $transmitter, InitializeParams $params) use ($logge
         $clientApi = new ClientApi(new JsonRpcClient($transmitter, $responseWatcher));
 
         $diagnosticsService = new DiagnosticsService(
-            new DiagnosticsEngine($clientApi, new AggregateDiagnosticsProvider(
+            new DiagnosticsEngine($clientApi, [new AggregateDiagnosticsProvider(
                 $logger,
                 new SayHelloDiagnosticsProvider()
-            ))
+            )])
         );
 
         $serviceProviders = new ServiceProviders($diagnosticsService);

tests/Unit/Core/Diagnostics/DiagnosticsEngineTest.php

@@ -76,13 +76,15 @@ public function testDeduplicatesSuccessiveChangesToSameFile(): Generator
         $token = new CancellationTokenSource();
         $promise = $engine->run($token->getToken());
 
+        $engine->enqueue(ProtocolFactory::textDocumentItem('file:///foobar', 'foobar'));
         $engine->enqueue(ProtocolFactory::textDocumentItem('file:///foobar', 'foobar'));
         $engine->enqueue(ProtocolFactory::textDocumentItem('file:///foobar', 'foobar'));
 
-        yield new Delayed(10);
+        yield new Delayed(1);
 
         $token->cancel();
 
+        // clear three times
         self::assertEquals(3, $tester->transmitter()->count());
     }