Merge branch '6.1' into 6.2

* 6.1:
  docs(console): add caution for testing option

Author: javiereguiluz

console.rst

@@ -531,6 +531,15 @@ call ``setAutoExit(false)`` on it to get the command result in ``CommandTester``
         $application->setAutoExit(false);
 
         $tester = new ApplicationTester($application);
+        
+
+.. caution::
+
+    When testing ``InputOption::VALUE_NONE`` command options, you must pass an
+    empty value to them::
+    
+        $commandTester = new CommandTester($command);
+        $commandTester->execute(['--some-option' => '']);
 
 .. note::