Simplify services definition in Behat

features/injecting_parameters_into_context.feature

@@ -35,7 +35,7 @@ Feature: Injecting parameters into context
         """
 
     Scenario: Injecting a parameter into a context explicitly set as public
-        Given a services file "config/services.yaml" containing:
+        Given a YAML services file containing:
             """
             services:
                 App\Tests\SomeContext:
@@ -47,7 +47,7 @@ Feature: Injecting parameters into context
         Then it should pass
 
     Scenario: Injecting a parameter into an autoconfigured context
-        Given a services file "config/services.yaml" containing:
+        Given a YAML services file containing:
             """
             services:
                 _defaults:

tests/Behat/Context/TestContext.php

@@ -123,6 +123,14 @@ CON
         $this->thereIsFile('config/services.yaml', '');
     }
 
+    /**
+     * @Given /^a YAML services file containing:$/
+     */
+    public function yamlServicesFile($content): void
+    {
+        $this->thereIsFile('config/services.yaml', (string) $content);
+    }
+
     /**
      * @Given /^a Behat configuration containing(?: "([^"]+)"|:)$/
      */