Use a valid key as the default

This is how the QuestionHelper API was intended to be used, but it only
has been so since a recent bugfix.
See symfony/symfony#25521
Fixes #1151

composer.json

@@ -18,7 +18,7 @@
         "ext-mbstring": "*",
         "behat/gherkin": "^4.5.1",
         "behat/transliterator": "^1.2",
-        "symfony/console": "~2.5||~3.0||~4.0",
+        "symfony/console": "~2.7.40||^2.8.33||~3.3.15||^3.4.3||^4.0.3",
         "symfony/config": "~2.3||~3.0||~4.0",
         "symfony/dependency-injection": "~2.1||~3.0||~4.0",
         "symfony/event-dispatcher": "~2.1||~3.0||~4.0",

src/Behat/Behat/Context/Cli/InteractiveContextIdentifier.php

@@ -70,7 +70,7 @@ public function guessTargetContextClass(ContextEnvironment $environment)
 
         $message = $this->translator->trans('snippet_context_choice', array('%1%' => $suiteName), 'output');
         $choices = array_values(array_merge(array('None'), $contextClasses));
-        $default = current($contextClasses);
+        $default = 1;
 
         $answer = $this->askQuestion('>> ' . $message, $choices, $default);