diff --git a/.php-cs-fixer.dist.php b/.php-cs-fixer.dist.php
index 0641794..348daa6 100644
--- a/.php-cs-fixer.dist.php
+++ b/.php-cs-fixer.dist.php
@@ -8,12 +8,14 @@
 
 return (new PhpCsFixer\Config())
     ->setRules([
-        '@PSR2' => true,
+        '@PSR12' => true,
+        'blank_line_after_opening_tag' => false,
         '@DoctrineAnnotation' => true,
         'array_syntax' => ['syntax' => 'short'],
         'no_unused_imports' => true,
+        'ordered_imports' => true,
         'blank_line_before_statement' => ['statements' => ['return']],
-        'visibility_required' => true,
+        'modifier_keywords' => true,
         'cast_spaces' => ['space' => 'single'],
         'concat_space' => ['spacing' => 'one'],
         'type_declaration_spaces' => true,
@@ -40,10 +42,11 @@
         'trim_array_spaces' => true,
         'single_space_around_construct' => true,
         'single_line_comment_spacing' => true,
-        'fully_qualified_strict_types' => true,
+        'fully_qualified_strict_types' => ['import_symbols' => true, 'leading_backslash_in_global_namespace' => true],
         'global_namespace_import' => ['import_classes' => false, 'import_constants' => null, 'import_functions' => null],
 
         'nullable_type_declaration_for_default_null_value' => true,
+        'attribute_empty_parentheses' => ['use_parentheses' => false],
 
         'no_empty_phpdoc' => true,
         'no_superfluous_phpdoc_tags' => ['allow_mixed' => true],
@@ -64,6 +67,10 @@
         'phpdoc_no_useless_inheritdoc' => true,
         'phpdoc_no_empty_return' => true,
         'phpdoc_no_alias_tag' => true,
+        'phpdoc_param_order' => true,
+        'multiline_comment_opening_closing' => true,
+
+        'php_unit_attributes' => true,
     ])
     ->setFinder($finder)
     ;
diff --git a/rector.php b/rector.php
index ad66646..efd89e3 100644
--- a/rector.php
+++ b/rector.php
@@ -3,18 +3,22 @@
 use Rector\CodeQuality\Rector\Attribute\SortAttributeNamedArgsRector;
 use Rector\CodeQuality\Rector\FuncCall\SortCallLikeNamedArgsRector;
 use Rector\Config\RectorConfig;
-use Rector\TypeDeclaration\Rector\Property\TypedPropertyFromStrictConstructorRector;
 use Rector\ValueObject\PhpVersion;
 
 return RectorConfig::configure()
-    ->withRules([
-        TypedPropertyFromStrictConstructorRector::class
-    ])
-    ->withPreparedSets(true, true)
+    ->withSkipPath(__DIR__ . '/tests/Fixtures')
     ->withSkip([
         // reorders the named arguments of swagger-php attributes, which decides the order
         // of the generated specifications
         SortAttributeNamedArgsRector::class,
         SortCallLikeNamedArgsRector::class,
     ])
+    ->withPreparedSets(
+        deadCode: true,
+        codeQuality: true,
+        codingStyle: true,
+        typeDeclarations: true,
+        phpunitCodeQuality: true,
+    )
+    ->withAttributesSets(phpunit: true)
     ->withPhpVersion(PhpVersion::PHP_82);
diff --git a/src/Adapters/AbstractOpenApiResponseVerifier.php b/src/Adapters/AbstractOpenApiResponseVerifier.php
index d3ac2df..52982ab 100644
--- a/src/Adapters/AbstractOpenApiResponseVerifier.php
+++ b/src/Adapters/AbstractOpenApiResponseVerifier.php
@@ -2,6 +2,7 @@
 
 namespace Radebatz\OpenApi\Verifier\Adapters;
 
+use Composer\Autoload\ClassLoader;
 use OpenApi\Generator;
 
 trait AbstractOpenApiResponseVerifier
@@ -41,9 +42,9 @@ protected function prepareOpenApiSpecificationLoader(string $srcDir, ?string $sp
      */
     protected function getAppRoot(): string
     {
-        $classLoader = (new \ReflectionClass(\Composer\Autoload\ClassLoader::class))->getFileName();
+        $classLoader = (new \ReflectionClass(ClassLoader::class))->getFileName();
         if (false === $classLoader) {
-            throw new \RuntimeException('Cannot locate the project root: Composer\'s ClassLoader has no file');
+            throw new \RuntimeException("Cannot locate the project root: Composer's ClassLoader has no file");
         }
 
         return dirname($classLoader, 3);
diff --git a/src/Adapters/Laravel/OpenApiResponseVerifier.php b/src/Adapters/Laravel/OpenApiResponseVerifier.php
index 2b7833a..f240e64 100644
--- a/src/Adapters/Laravel/OpenApiResponseVerifier.php
+++ b/src/Adapters/Laravel/OpenApiResponseVerifier.php
@@ -14,7 +14,8 @@
  */
 trait OpenApiResponseVerifier
 {
-    use AbstractOpenApiResponseVerifier, VerifiesOpenApi;
+    use AbstractOpenApiResponseVerifier;
+    use VerifiesOpenApi;
 
     public function registerOpenApiVerifier(?Application $app = null, ?string $specification = null): void
     {
diff --git a/src/Adapters/Laravel/OpenApiVerifierMiddleware.php b/src/Adapters/Laravel/OpenApiVerifierMiddleware.php
index d31c979..e3659f7 100644
--- a/src/Adapters/Laravel/OpenApiVerifierMiddleware.php
+++ b/src/Adapters/Laravel/OpenApiVerifierMiddleware.php
@@ -47,12 +47,12 @@ public function terminate(Request $request, Response $response): void
             // matched none, a 404 for example, has none
             $route = ($request->getRouteResolver())();
             $this->verifier->verify($psrRequest, $psrResponse, $route instanceof Route ? $route->uri() : null);
-        } catch (OpenApiSchemaMismatchException $oasme) {
+        } catch (OpenApiSchemaMismatchException $openApiSchemaMismatchException) {
             if ($this->onMismatch instanceof \Closure) {
-                ($this->onMismatch)($oasme, $psrResponse);
+                ($this->onMismatch)($openApiSchemaMismatchException, $psrResponse);
             }
 
-            throw $oasme;
+            throw $openApiSchemaMismatchException;
         }
     }
 }
diff --git a/src/Adapters/Psr15/OpenApiVerifierMiddleware.php b/src/Adapters/Psr15/OpenApiVerifierMiddleware.php
index f562792..6b15312 100644
--- a/src/Adapters/Psr15/OpenApiVerifierMiddleware.php
+++ b/src/Adapters/Psr15/OpenApiVerifierMiddleware.php
@@ -32,12 +32,12 @@ public function process(ServerRequestInterface $request, RequestHandlerInterface
 
         try {
             $this->verifier->verify($request, $response);
-        } catch (OpenApiSchemaMismatchException $oasme) {
+        } catch (OpenApiSchemaMismatchException $openApiSchemaMismatchException) {
             if ($this->onMismatch instanceof \Closure) {
-                ($this->onMismatch)($oasme, $response);
+                ($this->onMismatch)($openApiSchemaMismatchException, $response);
             }
 
-            throw $oasme;
+            throw $openApiSchemaMismatchException;
         }
 
         return $response;
diff --git a/src/Adapters/Slim/OpenApiResponseVerifier.php b/src/Adapters/Slim/OpenApiResponseVerifier.php
index f5522c7..59a1410 100644
--- a/src/Adapters/Slim/OpenApiResponseVerifier.php
+++ b/src/Adapters/Slim/OpenApiResponseVerifier.php
@@ -11,7 +11,8 @@
 
 trait OpenApiResponseVerifier
 {
-    use AbstractOpenApiResponseVerifier, VerifiesOpenApi;
+    use AbstractOpenApiResponseVerifier;
+    use VerifiesOpenApi;
 
     /**
      * @template TContainer of \Psr\Container\ContainerInterface|null
diff --git a/src/VerifiesOpenApi.php b/src/VerifiesOpenApi.php
index dd01269..0f44b29 100644
--- a/src/VerifiesOpenApi.php
+++ b/src/VerifiesOpenApi.php
@@ -3,8 +3,8 @@
 namespace Radebatz\OpenApi\Verifier;
 
 use PHPUnit\Framework\TestCase;
-use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
 
 trait VerifiesOpenApi
 {
diff --git a/tests/Adapters/AbstractOpenApiResponseVerifierTest.php b/tests/Adapters/AbstractOpenApiResponseVerifierTest.php
index ed54b90..4be77ce 100644
--- a/tests/Adapters/AbstractOpenApiResponseVerifierTest.php
+++ b/tests/Adapters/AbstractOpenApiResponseVerifierTest.php
@@ -5,9 +5,10 @@
 use PHPUnit\Framework\Attributes\Test;
 use PHPUnit\Framework\TestCase;
 use Radebatz\OpenApi\Verifier\Adapters\AbstractOpenApiResponseVerifier;
+use Radebatz\OpenApi\Verifier\OpenApiSpecificationLoader;
 use Radebatz\OpenApi\Verifier\VerifiesOpenApi;
 
-class AbstractOpenApiResponseVerifierTest extends TestCase
+final class AbstractOpenApiResponseVerifierTest extends TestCase
 {
     use AbstractOpenApiResponseVerifier;
     use VerifiesOpenApi;
@@ -32,7 +33,7 @@ protected function getAppRoot(): string
 
     protected function assertVerifiesUsers(): void
     {
-        $this->assertNotNull($this->getOpenApiSpecificationLoader());
+        $this->assertInstanceOf(OpenApiSpecificationLoader::class, $this->getOpenApiSpecificationLoader());
         $this->assertTrue($this->verifyOpenApiResponseBody(
             'get',
             '/users',
diff --git a/tests/Adapters/ClientAdapterTest.php b/tests/Adapters/ClientAdapterTest.php
index 73ae048..952c87c 100644
--- a/tests/Adapters/ClientAdapterTest.php
+++ b/tests/Adapters/ClientAdapterTest.php
@@ -16,7 +16,7 @@
 use Radebatz\OpenApi\Verifier\OpenApiSchemaMismatchException;
 use Radebatz\OpenApi\Verifier\OpenApiVerifier;
 
-class ClientAdapterTest extends TestCase
+final class ClientAdapterTest extends TestCase
 {
     protected function verifier(): OpenApiVerifier
     {
@@ -45,10 +45,10 @@ protected function send(callable $send, string $body, ?string $error): void
         try {
             /** @var ResponseInterface $response */
             $response = $send();
-        } catch (OpenApiSchemaMismatchException $oasme) {
-            $this->assertStringContainsString($error, (string) $oasme->getErrorSummary());
+        } catch (OpenApiSchemaMismatchException $openApiSchemaMismatchException) {
+            $this->assertStringContainsString($error, (string) $openApiSchemaMismatchException->getErrorSummary());
 
-            throw $oasme;
+            throw $openApiSchemaMismatchException;
         }
 
         // verifying must leave the body for the caller to read
@@ -61,9 +61,10 @@ public function guzzleMiddleware(string $path, string $body, ?string $error): vo
     {
         $stack = HandlerStack::create(new MockHandler([new Response(200, ['Content-Type' => 'application/json'], $body)]));
         $stack->push(new OpenApiVerifierMiddleware($this->verifier()), 'openapi-verifier');
+
         $client = new Client(['handler' => $stack, 'base_uri' => 'http://localhost']);
 
-        $this->send(fn () => $client->get($path), $body, $error);
+        $this->send(fn (): ResponseInterface => $client->get($path), $body, $error);
     }
 
     #[Test]
@@ -72,6 +73,7 @@ public function guzzleMiddlewareAsync(string $path, string $body, ?string $error
     {
         $stack = HandlerStack::create(new MockHandler([new Response(200, ['Content-Type' => 'application/json'], $body)]));
         $stack->push(new OpenApiVerifierMiddleware($this->verifier()), 'openapi-verifier');
+
         $client = new Client(['handler' => $stack, 'base_uri' => 'http://localhost']);
 
         $this->send(fn () => $client->getAsync($path)->wait(), $body, $error);
@@ -84,6 +86,6 @@ public function psr18Client(string $path, string $body, ?string $error): void
         $inner = new Client(['handler' => HandlerStack::create(new MockHandler([new Response(200, ['Content-Type' => 'application/json'], $body)]))]);
         $client = new OpenApiVerifyingClient($inner, $this->verifier());
 
-        $this->send(fn () => $client->sendRequest(new Request('GET', 'http://localhost' . $path)), $body, $error);
+        $this->send(fn (): ResponseInterface => $client->sendRequest(new Request('GET', 'http://localhost' . $path)), $body, $error);
     }
 }
diff --git a/tests/Adapters/LaravelAdapterTest.php b/tests/Adapters/LaravelAdapterTest.php
index b2a2d32..464f71f 100644
--- a/tests/Adapters/LaravelAdapterTest.php
+++ b/tests/Adapters/LaravelAdapterTest.php
@@ -10,7 +10,7 @@
 use PHPUnit\Framework\Attributes\Test;
 use Radebatz\OpenApi\Verifier\Adapters\Laravel\OpenApiResponseVerifier;
 
-class LaravelAdapterTest extends TestCase
+final class LaravelAdapterTest extends TestCase
 {
     use OpenApiResponseVerifier;
 
@@ -25,7 +25,7 @@ protected function setUp(): void
     public function passVerificationUsers(): void
     {
         $this->app
-            ->get('router')->get('/users', function () {
+            ->get('router')->get('/users', function (): string {
                 return '{"data":[{"id":1,"name":"joe","email":"joe@cool.com"}]}';
             });
 
@@ -38,7 +38,7 @@ public function passVerificationUsers(): void
     public function failVerificationUsers(): void
     {
         $this->app
-            ->get('router')->get('/users', function () {
+            ->get('router')->get('/users', function (): string {
                 return '{"data":[{"id":1,"email":"joe@cool.com"}]}';
             });
 
@@ -51,7 +51,7 @@ public function failVerificationUsers(): void
     public function passVerificationUser(): void
     {
         $this->app
-            ->get('router')->get('/user/{id}', function () {
+            ->get('router')->get('/user/{id}', function (): string {
                 return '{"data":{"id":1,"name":"joe","email":"joe@cool.com"}}';
             });
 
@@ -64,7 +64,7 @@ public function passVerificationUser(): void
     public function failVerificationUser(): void
     {
         $this->app
-            ->get('router')->get('/user/{id}', function () {
+            ->get('router')->get('/user/{id}', function (): string {
                 return '{"data":{"id":1,"name":"joe"}}';
             });
 
diff --git a/tests/Adapters/Psr15AdapterTest.php b/tests/Adapters/Psr15AdapterTest.php
index 7e452c3..acf58e2 100644
--- a/tests/Adapters/Psr15AdapterTest.php
+++ b/tests/Adapters/Psr15AdapterTest.php
@@ -13,7 +13,7 @@
 use Radebatz\OpenApi\Verifier\OpenApiSchemaMismatchException;
 use Radebatz\OpenApi\Verifier\OpenApiVerifier;
 
-class Psr15AdapterTest extends TestCase
+final class Psr15AdapterTest extends TestCase
 {
     protected function handle(string $body, ?\Closure $onMismatch = null): ResponseInterface
     {
@@ -22,7 +22,7 @@ protected function handle(string $body, ?\Closure $onMismatch = null): ResponseI
             $onMismatch
         );
 
-        $handler = new class($body) implements RequestHandlerInterface {
+        $handler = new class ($body) implements RequestHandlerInterface {
             public function __construct(private readonly string $body)
             {
             }
diff --git a/tests/Adapters/SlimAdapterTest.php b/tests/Adapters/SlimAdapterTest.php
index 9c7118f..8826961 100644
--- a/tests/Adapters/SlimAdapterTest.php
+++ b/tests/Adapters/SlimAdapterTest.php
@@ -12,7 +12,7 @@
 use Radebatz\OpenApi\Verifier\Adapters\Slim\OpenApiResponseVerifier;
 use Slim\Factory\AppFactory;
 
-class SlimAdapterTest extends TestCase
+final class SlimAdapterTest extends TestCase
 {
     use OpenApiResponseVerifier;
 
@@ -21,7 +21,7 @@ public function passVerificationUsers(): void
     {
         $response = $this->runApp('GET', '/users', valid: true);
 
-        $this->assertEquals(200, $response->getStatusCode());
+        $this->assertSame(200, $response->getStatusCode());
     }
 
     #[Test]
@@ -38,7 +38,7 @@ public function passVerificationUser(): void
     {
         $response = $this->runApp('GET', '/user/1', valid: true);
 
-        $this->assertEquals(200, $response->getStatusCode());
+        $this->assertSame(200, $response->getStatusCode());
     }
 
     #[Test]
@@ -68,23 +68,23 @@ protected function runApp(string $requestMethod, string $requestUri, bool $valid
 
         // register test route as we do not have an actual app...
         if ($valid) {
-            $app->get('/users', function (RequestInterface $request, ResponseInterface $response) {
+            $app->get('/users', function (RequestInterface $request, ResponseInterface $response): ResponseInterface {
                 $response->getBody()->write('{"data":[{"id":1,"name":"joe","email":"joe@cool.com"}]}');
 
                 return $response;
             });
-            $app->get('/user/{id}', function (RequestInterface $request, ResponseInterface $response) {
+            $app->get('/user/{id}', function (RequestInterface $request, ResponseInterface $response): ResponseInterface {
                 $response->getBody()->write('{"data":{"id":1,"name":"joe","email":"joe@cool.com"}}');
 
                 return $response;
             });
         } else {
-            $app->get('/users', function (RequestInterface $request, ResponseInterface $response) {
+            $app->get('/users', function (RequestInterface $request, ResponseInterface $response): ResponseInterface {
                 $response->getBody()->write('{"data":[{"id":1,"email":"joe@cool.com"}]}');
 
                 return $response;
             });
-            $app->get('/user/{id}', function (RequestInterface $request, ResponseInterface $response) {
+            $app->get('/user/{id}', function (RequestInterface $request, ResponseInterface $response): ResponseInterface {
                 $response->getBody()->write('{"data":{"id":1,"name":"joe"}}');
 
                 return $response;
diff --git a/tests/OpenApiSchemaMismatchExceptionTest.php b/tests/OpenApiSchemaMismatchExceptionTest.php
index 69f2ebe..ea15cc9 100644
--- a/tests/OpenApiSchemaMismatchExceptionTest.php
+++ b/tests/OpenApiSchemaMismatchExceptionTest.php
@@ -8,7 +8,7 @@
 use Radebatz\OpenApi\Verifier\OpenApiSchemaMismatchException;
 use Radebatz\OpenApi\Verifier\Schema\SchemaError;
 
-class OpenApiSchemaMismatchExceptionTest extends TestCase
+final class OpenApiSchemaMismatchExceptionTest extends TestCase
 {
     #[Test]
     public function getErrorsReturnsSetData(): void
diff --git a/tests/OpenApiSpecificationLoaderTest.php b/tests/OpenApiSpecificationLoaderTest.php
index a83b9e1..ce496c5 100644
--- a/tests/OpenApiSpecificationLoaderTest.php
+++ b/tests/OpenApiSpecificationLoaderTest.php
@@ -7,22 +7,17 @@
 use PHPUnit\Framework\TestCase;
 use Radebatz\OpenApi\Verifier\OpenApiSpecificationLoader;
 
-class OpenApiSpecificationLoaderTest extends TestCase
+final class OpenApiSpecificationLoaderTest extends TestCase
 {
-    /**
-     * @return iterable<array<mixed>>
-     */
-    public static function specifications(): iterable
+    public static function specifications(): \Iterator
     {
-        return [
-            [__DIR__ . '/specifications/users.json', true],
-            [__DIR__ . '/specifications/users.yaml', true],
-            [__DIR__ . '/specifications/nope.json', false],
-            [__DIR__ . '/specifications/nope.yaml', false],
-            [__DIR__ . '/specifications/nope.yml', false],
-            [new \stdClass(), true],
-            [[], false],
-        ];
+        yield [__DIR__ . '/specifications/users.json', true];
+        yield [__DIR__ . '/specifications/users.yaml', true];
+        yield [__DIR__ . '/specifications/nope.json', false];
+        yield [__DIR__ . '/specifications/nope.yaml', false];
+        yield [__DIR__ . '/specifications/nope.yml', false];
+        yield [new \stdClass(), true];
+        yield [[], false];
     }
 
     #[Test]
@@ -39,19 +34,14 @@ public function loadSpecification(mixed $filename, bool $valid): void
         $this->assertSame('3.0.0', $specificationLoader->getOpenApiVersion());
     }
 
-    /**
-     * @return iterable<array<mixed>>
-     */
-    public static function responseSchemas(): iterable
+    public static function responseSchemas(): \Iterator
     {
-        return [
-            'ucmethod-json-ok' => [__DIR__ . '/specifications/users.json', 'GET', '/users', 200, true],
-            'lcmethod-json-ok' =>[__DIR__ . '/specifications/users.json', 'get', '/users', 200, true],
-            'yaml-ok' => [__DIR__ . '/specifications/users.yaml', 'get', '/users', 200, true],
-            'path-no-match' => [__DIR__ . '/specifications/users.yaml', 'get', '/foo', 200, false],
-            'status-no-match' => [__DIR__ . '/specifications/users.json', 'get', '/users', 404, false],
-            'status-no-schema' => [__DIR__ . '/specifications/users.yaml', 'get', '/users', 401, false],
-        ];
+        yield 'ucmethod-json-ok' => [__DIR__ . '/specifications/users.json', 'GET', '/users', 200, true];
+        yield 'lcmethod-json-ok' => [__DIR__ . '/specifications/users.json', 'get', '/users', 200, true];
+        yield 'yaml-ok' => [__DIR__ . '/specifications/users.yaml', 'get', '/users', 200, true];
+        yield 'path-no-match' => [__DIR__ . '/specifications/users.yaml', 'get', '/foo', 200, false];
+        yield 'status-no-match' => [__DIR__ . '/specifications/users.json', 'get', '/users', 404, false];
+        yield 'status-no-schema' => [__DIR__ . '/specifications/users.yaml', 'get', '/users', 401, false];
     }
 
     #[Test]
@@ -63,7 +53,7 @@ public function getResponseSchemaFor(string $specification, string $method, stri
         $schema = $specificationLoader->getResponseSchemaFor($method, $path, $statusCode);
 
         if ($valid) {
-            $this->assertNotNull($schema);
+            $this->assertInstanceOf(\stdClass::class, $schema);
             // carries the components, so its references resolve
             $this->assertObjectHasProperty('components', $schema);
         } else {
diff --git a/tests/OpenApiVerifierTest.php b/tests/OpenApiVerifierTest.php
index c0b2621..d4351d1 100644
--- a/tests/OpenApiVerifierTest.php
+++ b/tests/OpenApiVerifierTest.php
@@ -12,7 +12,7 @@
 use Radebatz\OpenApi\Verifier\Schema\SchemaError;
 use Radebatz\OpenApi\Verifier\Schema\SchemaValidator;
 
-class OpenApiVerifierTest extends TestCase
+final class OpenApiVerifierTest extends TestCase
 {
     /**
      * @param  array<string, mixed> $schema
@@ -168,7 +168,7 @@ public function translationLeavesTheSpecificationAlone(): void
     #[Test]
     public function aValidatorGetsTheSchemaAsWrittenAndTheVersion(): void
     {
-        $validator = new class implements SchemaValidator {
+        $validator = new class () implements SchemaValidator {
             public ?string $version = null;
 
             public ?\stdClass $schema = null;
@@ -190,8 +190,8 @@ public function validate(mixed $data, \stdClass $schema, string $openApiVersion)
         try {
             OpenApiVerifier::fromSpecification($specification, $validator)->verifyResponseBody('get', '/thing', 200, '"x"');
             $this->fail('No exception thrown');
-        } catch (OpenApiSchemaMismatchException $oasme) {
-            $this->assertSame('custom', $oasme->getErrors()[0]->keyword);
+        } catch (OpenApiSchemaMismatchException $openApiSchemaMismatchException) {
+            $this->assertSame('custom', $openApiSchemaMismatchException->getErrors()[0]->keyword);
         }
 
         $this->assertSame('3.0.3', $validator->version);
diff --git a/tests/VerifiesOpenApiTest.php b/tests/VerifiesOpenApiTest.php
index 059c54e..3b36736 100644
--- a/tests/VerifiesOpenApiTest.php
+++ b/tests/VerifiesOpenApiTest.php
@@ -11,23 +11,18 @@
 use Radebatz\OpenApi\Verifier\OpenApiSpecificationLoader;
 use Radebatz\OpenApi\Verifier\VerifiesOpenApi;
 
-class VerifiesOpenApiTest extends TestCase
+final class VerifiesOpenApiTest extends TestCase
 {
     use VerifiesOpenApi;
 
-    /**
-     * @return iterable<array<mixed>>
-     */
-    public static function responses(): iterable
+    public static function responses(): \Iterator
     {
-        return [
-            'users-invalid-json' => ['get', '/users', 200, 'xxx', false, false],
-            'invalid-path' => ['get', '/xxxxx', 200, 'xxx', true, false],
-            'users-no-schema-invalid-json' => ['get', '/users', 401, 'xxx', true, false],
-            'users-verified-bad' => ['get', '/users', 200, '{"data":[{}]}', false, true],
-            'users-verified-ok' => ['get', '/users', 200, '{"data":[{"id":1,"name":"joe","email":"joe@cool.com"}]}', true, true],
-            'users-verified-nullable-ok' => ['get', '/users', 200, '{"data":[{"id":1,"name":"joe","email":"joe@cool.com", "dob": null}]}', true, true],
-        ];
+        yield 'users-invalid-json' => ['get', '/users', 200, 'xxx', false, false];
+        yield 'invalid-path' => ['get', '/xxxxx', 200, 'xxx', true, false];
+        yield 'users-no-schema-invalid-json' => ['get', '/users', 401, 'xxx', true, false];
+        yield 'users-verified-bad' => ['get', '/users', 200, '{"data":[{}]}', false, true];
+        yield 'users-verified-ok' => ['get', '/users', 200, '{"data":[{"id":1,"name":"joe","email":"joe@cool.com"}]}', true, true];
+        yield 'users-verified-nullable-ok' => ['get', '/users', 200, '{"data":[{"id":1,"name":"joe","email":"joe@cool.com", "dob": null}]}', true, true];
     }
 
     #[Test]
@@ -46,7 +41,7 @@ public function verifyBody(string $method, string $path, int $statusCode, string
             }
         }
 
-        $this->assertEquals($isVerified, $verified);
+        $this->assertSame($isVerified, $verified);
     }
 
     #[Test]
@@ -69,7 +64,7 @@ public function verifyRequestResponse(): void
     }
 
     /** @inheritdoc */
-    protected function getOpenApiSpecificationLoader(): ?OpenApiSpecificationLoader
+    protected function getOpenApiSpecificationLoader(): OpenApiSpecificationLoader
     {
         return new OpenApiSpecificationLoader(__DIR__ . '/specifications/users.yaml');
     }