Replace PHPStan with Psalm

src/Context/Environment/Handler/ContextServiceEnvironmentHandler.php

@@ -85,8 +85,6 @@ final class ContextServiceEnvironmentHandler implements EnvironmentHandler
     }
 
     /**
-     * @param UninitializedSymfonyExtensionEnvironment $uninitializedEnvironment
-     *
      * @throws EnvironmentIsolationException
      */
     public function isolateEnvironment(Environment $uninitializedEnvironment, $testSubject = null): Environment
@@ -174,6 +172,8 @@ final class ContextServiceEnvironmentHandler implements EnvironmentHandler
     }
 
     /**
+     * @psalm-assert UninitializedSymfonyExtensionEnvironment $uninitializedEnvironment
+     *
      * @throws EnvironmentIsolationException
      */
     private function assertEnvironmentCanBeIsolated(Environment $uninitializedEnvironment, $testSubject): void

src/Context/Environment/InitializedSymfonyExtensionEnvironment.php

@@ -49,7 +49,7 @@ final class InitializedSymfonyExtensionEnvironment implements SymfonyExtensionEn
     {
         $callable = $callee->getCallable();
 
-        if ($callee->isAnInstanceMethod()) {
+        if (is_array($callable) && $callee->isAnInstanceMethod()) {
             return [$this->getContext($callable[0]), $callable[1]];
         }
 

src/Context/Environment/UninitializedSymfonyExtensionEnvironment.php

@@ -26,7 +26,7 @@ final class UninitializedSymfonyExtensionEnvironment extends StaticEnvironment i
     /** @var string[] */
     private $contexts;
 
-    /** @var ContextEnvironment|null */
+    /** @var ContextEnvironment */
     private $delegatedEnvironment;
 
     public function __construct(Suite $suite, array $contexts, ContextEnvironment $delegatedEnvironment)