[Console] Adapt doc for easier testing of commands needing user inputs

Fix missing colon

Change userInputs to inputs

Try to fix platformsh build

Re-add useful use statements

Author: chalasr

components/console/helpers/questionhelper.rst

@@ -214,6 +214,8 @@ be suffixed with ``Bundle``. You can validate that by using the
 :method:`Symfony\\Component\\Console\\Question\\Question::setValidator`
 method::
 
+    use Symfony\Component\Console\Helper\QuestionHelper;
+    use Symfony\Component\Console\Helper\HelperSet;
     use Symfony\Component\Console\Question\Question;
 
     // ...
@@ -276,11 +278,9 @@ You can also use a validator with a hidden question::
 Testing a Command that Expects Input
 ------------------------------------
 
-If you want to write a unit test for a command which expects some kind of input
-from the command line, you need to set the helper input stream::
+If you want to write a unit test for a command which expects user inputs
+from the command line, you need to set the inputs like this::
 
-    use Symfony\Component\Console\Helper\QuestionHelper;
-    use Symfony\Component\Console\Helper\HelperSet;
     use Symfony\Component\Console\Tester\CommandTester;
 
     // ...
@@ -289,26 +289,15 @@ from the command line, you need to set the helper input stream::
         // ...
         $commandTester = new CommandTester($command);
 
-        $helper = $command->getHelper('question');
-        $helper->setInputStream($this->getInputStream("Test\n"));
+        $commandTester->setInputs(array('Test'));
         // Equals to a user inputting "Test" and hitting ENTER
-        // If you need to enter a confirmation, "yes\n" will work
+        // If you need to enter a confirmation, adding a second input saying "yes" will work
 
         $commandTester->execute(array('command' => $command->getName()));
 
         // $this->assertRegExp('/.../', $commandTester->getDisplay());
     }
 
-    protected function getInputStream($input)
-    {
-        $stream = fopen('php://memory', 'r+', false);
-        fputs($stream, $input);
-        rewind($stream);
-
-        return $stream;
-    }
-
-By setting the input stream of the ``QuestionHelper``, you imitate what the
-console would do internally with all user input through the CLI. This way
-you can test any user interaction (even complex ones) by passing an appropriate
-input stream.
+By calling :method:`CommandTester::setInputs`, you imitate what the console would
+do internally with all user input through the CLI. This way you can test any
+user interaction (even complex ones) by passing the appropriate inputs.