Improve wording of invalid extension behaviour

features/install-extensions.feature

@@ -23,7 +23,7 @@ Feature: Extensions can be installed with Behat
     Then the extension should have been built
 
   Example: An extension can be built with warnings at PHP startup
-    Given I use the "-d extension=invalid_extension.so" PHP arguments
+    Given I have an invalid extension installed
     When I run a command to build an extension
     Then the extension should have been built
 

test/behaviour/CliContext.php

@@ -5,14 +5,14 @@
 namespace Php\PieBehaviourTest;
 
 use Behat\Behat\Context\Context;
+use Behat\Step\Given;
 use Behat\Step\Then;
 use Behat\Step\When;
 use Composer\Util\Platform;
 use Symfony\Component\Process\Process;
 use Webmozart\Assert\Assert;
 
 use function array_merge;
-use function explode;
 
 /** @psalm-api */
 class CliContext implements Context
@@ -132,9 +132,9 @@ public function theExtensionShouldHaveBeenInstalled(): void
         Assert::regex($this->output, '#Install complete: [-_a-zA-Z0-9/]+/example_pie_extension.so#');
     }
 
-    #[When('I use the :phpArguments PHP arguments')]
-    public function iUsePhpArguments(string $phpArguments): void
+    #[Given('I have an invalid extension installed')]
+    public function iHaveAnInvalidExtensionInstalled(): void
     {
-        $this->phpArguments = explode(' ', $phpArguments);
+        $this->phpArguments = ['-d', 'extension=invalid_extension'];
     }
 }