Fix PHP8 deprecation

.travis.yml

@@ -13,6 +13,7 @@ php:
   - 7.0
   - 7.1
   - 7.2
+  - 8.0
   - hhvm
 
 matrix:
@@ -26,6 +27,8 @@ matrix:
     # Test against dev dependencies
     - php: 7.2
       env: DEPS=dev
+    - php: 8.0
+      env: DEPS=dev
 
 before_install:
   - if [ "$SYMFONY_VERSION" != "" ]; then composer require --no-update symfony/lts=$SYMFONY_VERSION; fi;

composer.json

@@ -25,7 +25,7 @@
 
     "require-dev": {
         "behat/mink-goutte-driver": "^1.1",
-        "phpspec/phpspec":          "^2.0"
+        "phpspec/phpspec":          "^7.0"
     },
 
     "autoload": {

src/Behat/MinkExtension/ServiceContainer/Driver/GoutteFactory.php

@@ -115,12 +115,11 @@ private function buildGuzzle3Client(array $parameters)
     private function isGoutte1()
     {
         $refl = new \ReflectionParameter(array('Goutte\Client', 'setClient'), 0);
-
-        if ($refl->getClass() && 'Guzzle\Http\ClientInterface' === $refl->getClass()->getName()) {
-            return true;
+        if (version_compare(PHP_VERSION, '8.0.0', '<')) {
+          return $refl->getClass() && 'Guzzle\Http\ClientInterface' === $refl->getClass()->getName();
         }
 
-        return false;
+        return $refl->getType() instanceof \ReflectionNamedType && 'Guzzle\Http\ClientInterface' === $refl->getType()->getName();
     }
 
     private function isGuzzle6()