Fixed command interfaces

classes/Commands/TestEnvironmentStartCommand.php

@@ -22,7 +22,7 @@ class TestEnvironmentStartCommand extends Command {
         ->addOption('host', null, InputOption::VALUE_OPTIONAL, 'Bind test environment to this host.', '127.0.0.1');
     }
 
-    protected function execute(InputInterface $input, OutputInterface $output) {
+    protected function execute(InputInterface $input, OutputInterface $output): int {
       if (!CredentialManager::isConfigured())
         throw new \Exception("The 'cloudobjects' CLI tool must be installed and authorized.");
 
@@ -49,6 +49,7 @@ class TestEnvironmentStartCommand extends Command {
           die("THRU!");
         }
       }
+      return Command::SUCCESS;
     }
 
 }