added some tests

src/Resolver/Value/ValidatedValue.php

@@ -47,6 +47,6 @@ public function jsonSerialize()
 
     public function printValue() : string
     {
-        return \json_encode($this->value, JSON_THROW_ON_ERROR, 512);
+        return \json_encode($this->value, \JSON_THROW_ON_ERROR);
     }
 }

tests/Spec/DirectiveTest.php

@@ -108,6 +108,10 @@ public function testRepeatable() : void
     public function invalidDataProvider() : array
     {
         return [
+            [
+                'query queryName { field0 { field1 @skip(if: false) @skip(if: false) { name } } }',
+                \Graphpinator\Exception\Normalizer\DuplicatedDirective::class,
+            ],
             [
                 'query queryName { field0 { field1 @include(if: false) @include(if: false) { name } } }',
                 \Graphpinator\Exception\Normalizer\DuplicatedDirective::class,

tests/Unit/Type/Container/SimpleContainerTest.php

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Graphpinator\Tests\Unit\Type\Container;
+
+final class SimpleContainerTest extends \PHPUnit\Framework\TestCase
+{
+    public function testSimple() : void
+    {
+        $container = new \Graphpinator\Type\Container\SimpleContainer([], []);
+
+        self::assertCount(0, $container->getTypes());
+        self::assertCount(0, $container->getDirectives());
+
+        foreach ([
+            'ID', 'Int', 'Float', 'String', 'Boolean',
+            '__Schema', '__Type', '__TypeKind', '__Field', '__EnumValue', '__InputValue',
+             '__Directive', '__DirectiveLocation'
+                 ] as $typeName) {
+            self::assertInstanceOf(\Graphpinator\Type\Contract\NamedDefinition::class, $container->getType($typeName));
+        }
+
+        foreach (['skip', 'include'] as $directiveName) {
+            self::assertInstanceOf(\Graphpinator\Directive\Directive::class, $container->getDirective($directiveName));
+        }
+    }
+}