GraphQL\Tests\Type\DefinitionTest

Complexity

Total Complexity

84

Size/Duplication

Total Lines	1735
Duplicated Lines	0 %

Importance

Changes

0

74 Methods

Rating	Name	Duplication	Size	Complexity
A	testDefinesSubscriptionSchema()	0	13	1
A	testJSONStringifiesSimpleTypes()	0	13	1
A	testIncludesInterfacesThunkSubtypesInTheTypeMap()	0	32	1
A	testIdentifiesOutputTypes()	0	16	2
A	testAllowsRecursiveDefinitions()	0	63	1
A	testStringifiesSimpleTypes()	0	16	1
A	testProhibitsNestingNonNullInsideNonNull()	0	7	1
A	testIdentifiesInputTypes()	0	16	2
B	setUp()	0	87	1
A	testDefinesAnEnumTypeWithAValueOfNullAndUndefined()	0	32	1
A	testDefinesAQueryOnlySchema()	0	39	1
A	testIncludesInterfaceSubtypesInTheTypeMap()	0	27	1
A	testIncludesNestedInputObjectInTheMap()	0	25	1
A	testDefinesAMutationSchema()	0	14	1
A	testAllowsThunkForUnionTypes()	0	12	1
A	testDefinesEnumTypeWithDeprecatedValue()	0	23	1
A	testDefinesAnObjectTypeWithDeprecatedField()	0	19	1
A	testAcceptsAnObjectTypeWithArrayInterfaces()	0	8	1
A	testAcceptsAUnionTypeDefiningResolveType()	0	8	1
A	testInputObjectTypeAllowsRecursiveDefinitions()	0	35	1
A	testAcceptsAUnionOfObjectTypesDefiningIsTypeOf()	0	8	1
A	testRejectsAnInputObjectTypeWithFieldsFunctionThatReturnsIncorrectType()	0	14	1
A	testRejectsASchemaWhichHaveSameNamedObjectsImplementingAnInterface()	0	36	1
A	testAcceptsAnObjectTypeWithFieldArgs()	0	16	1
A	testRejectsAnEnumTypeWithIncorrectlyTypedValues()	0	11	1
A	testAcceptsAnObjectTypeWithInterfacesAsAFunctionReturningAnArray()	0	10	1
A	testRejectsAnObjectTypeWithInterfacesAsAFunctionReturningAnIncorrectType()	0	14	1
A	testRejectsAnObjectTypeFieldWithUndefinedConfig()	0	11	1
A	testRejectsAScalarTypeDefiningParseValueButNotParseLiteral()	0	12	1
A	testAcceptsAWellDefinedEnumTypeWithEmptyValueDefinition()	0	11	1
A	testRejectsAScalarTypeDefiningParseLiteralButNotParseValue()	0	12	1
A	testAcceptsAnObjectTypeWithAFieldFunction()	0	12	1
A	testRejectsAnObjectTypeWithIncorrectlyTypedFields()	0	12	1
A	testAllowsOverridingInternalTypes()	0	18	1
A	testRejectsASchemaWhichRedefinesABuiltInType()	0	23	1
A	testAcceptsAnInterfaceTypeDefiningResolveType()	0	14	1
A	testInfersNameFromClassname()	0	7	1
A	testRejectsAScalarTypeDefiningParseValueAndParseLiteralWithAnIncorrectType()	0	13	1
A	testAcceptsAnInterfaceTypeDefiningResolveTypeWithImplementingTypeDefiningIsTypeOf()	0	14	1
A	testAcceptsAUnionTypeWithFunctionReturningAnArrayOfTypes()	0	8	1
A	testDoesNotAllowIsDeprecatedWithoutDeprecationReasonOnEnum()	0	14	1
A	schemaWithFieldType()	0	12	1
A	testDoesNotAllowIsDeprecatedWithoutDeprecationReasonOnField()	0	17	1
A	testAcceptsAnInterfaceWithImplementingTypeDefiningIsTypeOf()	0	14	1
A	testRejectsAnObjectTypeWithAnIncorrectTypeForIsTypeOf()	0	11	1
A	objectWithIsTypeOf()	0	5	1
A	testRejectsAnInputObjectTypeWithResolvers()	0	19	1
A	testRejectsAConstantScalarValueResolver()	0	7	1
A	testRejectsASchemaWhichDefinesAnObjectTypeTwice()	0	26	1
A	testInterfaceTypeAllowsRecursiveDefinitions()	0	29	1
A	testAcceptsAScalarTypeDefiningSerialize()	0	9	1
A	testRejectsAnInputObjectTypeWithIncorrectFields()	0	12	1
A	testAcceptsAnInputObjectTypeWithAFieldFunction()	0	12	1
A	testAcceptsAUnionTypeDefiningResolveTypeOfObjectTypesDefiningIsTypeOf()	0	8	1
A	testListMustAcceptOnlyTypes()	0	30	5
A	testAcceptsAWellDefinedEnumTypeWithInternalValueDefinition()	0	11	1
A	testRejectsAScalarTypeNotDefiningSerialize()	0	10	1
A	testAcceptsALambdaAsAnObjectFieldResolver()	0	5	1
A	testRejectsAnInputObjectTypeWithResolverConstant()	0	17	1
A	testNonNullMustOnlyAcceptNonNullableTypes()	0	34	5
A	testRejectsAUnionTypeWithIncorrectlyTypedTypes()	0	10	1
A	testAllowsShorthandFieldDefinition()	0	40	1
A	testRejectsAnUnionTypeWithAnIncorrectTypeForResolveType()	0	11	1
A	testAcceptsAScalarTypeDefiningParseValueAndParseLiteral()	0	12	1
A	testRejectsAnInterfaceTypeWithAnIncorrectTypeForResolveType()	0	13	1
A	testRejectsAScalarTypeDefiningSerializeWithAnIncorrectType()	0	12	1
A	testRejectsAnObjectTypeWithAFieldFunctionThatReturnsIncorrectType()	0	14	1
A	testRejectsAnEmptyObjectFieldResolver()	0	7	1
A	schemaWithObjectWithFieldResolver()	0	23	1
A	testAcceptsAnObjectTypeWithAnIsTypeOfFunction()	0	8	1
A	testAcceptsAnInputObjectTypeWithFields()	0	10	1
A	testRejectsAUnionTypeWithoutTypes()	0	8	1
A	testRejectsAnObjectTypeWithIncorrectlyTypedInterfaces()	0	12	1
A	testAcceptsAUnionTypeWithArrayTypes()	0	8	1

<?php

declare(strict_types=1);

namespace GraphQL\Tests\Type;

use GraphQL\Error\InvariantViolation;
use GraphQL\Tests\Type\TestClasses\MyCustomType;
use GraphQL\Tests\Type\TestClasses\OtherCustom;
use GraphQL\Type\Definition\CustomScalarType;
use GraphQL\Type\Definition\EnumType;
use GraphQL\Type\Definition\InputObjectType;
use GraphQL\Type\Definition\InterfaceType;
use GraphQL\Type\Definition\ListOfType;
use GraphQL\Type\Definition\NonNull;
use GraphQL\Type\Definition\ObjectType;
use GraphQL\Type\Definition\Type;
use GraphQL\Type\Definition\UnionType;
use GraphQL\Type\Schema;
use GraphQL\Utils\Utils;
use PHPUnit\Framework\TestCase;
use function count;
use function get_class;
use function json_encode;
use function sprintf;

class DefinitionTest extends TestCase
{
    /** @var ObjectType */
    public $blogImage;

    /** @var ObjectType */
    public $blogArticle;

    /** @var ObjectType */
    public $blogAuthor;

    /** @var ObjectType */
    public $blogMutation;

    /** @var ObjectType */
    public $blogQuery;

    /** @var ObjectType */
    public $blogSubscription;

    /** @var ObjectType */
    public $objectType;

    /** @var ObjectType */
    public $objectWithIsTypeOf;

    /** @var InterfaceType */
    public $interfaceType;

    /** @var UnionType */
    public $unionType;

    /** @var EnumType */
    public $enumType;

    /** @var InputObjectType */
    public $inputObjectType;

    /** @var CustomScalarType */
    public $scalarType;

    public function setUp()
    {
        $this->objectType      = new ObjectType(['name' => 'Object', 'fields' => ['tmp' => Type::string()]]);
        $this->interfaceType   = new InterfaceType(['name' => 'Interface']);
        $this->unionType       = new UnionType(['name' => 'Union', 'types' => [$this->objectType]]);
        $this->enumType        = new EnumType(['name' => 'Enum']);
        $this->inputObjectType = new InputObjectType(['name' => 'InputObject']);

        $this->objectWithIsTypeOf = new ObjectType([
            'name'   => 'ObjectWithIsTypeOf',
            'fields' => ['f' => ['type' => Type::string()]],
        ]);

        $this->scalarType = new CustomScalarType([
            'name'         => 'Scalar',
            'serialize'    => function () {
            },
            'parseValue'   => function () {
            },
            'parseLiteral' => function () {
            },
        ]);

        $this->blogImage = new ObjectType([
            'name'   => 'Image',
            'fields' => [
                'url'    => ['type' => Type::string()],
                'width'  => ['type' => Type::int()],
                'height' => ['type' => Type::int()],
            ],
        ]);

        $this->blogAuthor = new ObjectType([
            'name'   => 'Author',
            'fields' => function () {
                return [
                    'id'            => ['type' => Type::string()],
                    'name'          => ['type' => Type::string()],
                    'pic'           => [
                        'type' => $this->blogImage,
                        'args' => [
                            'width'  => ['type' => Type::int()],
                            'height' => ['type' => Type::int()],
                        ],
                    ],
                    'recentArticle' => $this->blogArticle,
                ];
            },
        ]);

        $this->blogArticle = new ObjectType([
            'name'   => 'Article',
            'fields' => [
                'id'          => ['type' => Type::string()],
                'isPublished' => ['type' => Type::boolean()],
                'author'      => ['type' => $this->blogAuthor],
                'title'       => ['type' => Type::string()],
                'body'        => ['type' => Type::string()],
            ],
        ]);

        $this->blogQuery = new ObjectType([
            'name'   => 'Query',
            'fields' => [
                'article' => [
                    'type' => $this->blogArticle,
                    'args' => [
                        'id' => ['type' => Type::string()],
                    ],
                ],
                'feed'    => ['type' => new ListOfType($this->blogArticle)],
            ],
        ]);

        $this->blogMutation = new ObjectType([
            'name'   => 'Mutation',
            'fields' => [
                'writeArticle' => ['type' => $this->blogArticle],
            ],
        ]);

        $this->blogSubscription = new ObjectType([
            'name'   => 'Subscription',
            'fields' => [
                'articleSubscribe' => [
                    'args' => ['id' => ['type' => Type::string()]],
                    'type' => $this->blogArticle,
                ],
            ],
        ]);
    }

    // Type System: Example

    /**
     * @see it('defines a query only schema')
     */
    public function testDefinesAQueryOnlySchema() : void
    {
        $blogSchema = new Schema([
            'query' => $this->blogQuery,
        ]);

        $this->assertSame($blogSchema->getQueryType(), $this->blogQuery);

        $articleField = $this->blogQuery->getField('article');
        $this->assertSame($articleField->getType(), $this->blogArticle);
        $this->assertSame($articleField->getType()->name, 'Article');
        $this->assertSame($articleField->name, 'article');

        /** @var ObjectType $articleFieldType */
        $articleFieldType = $articleField->getType();
        $titleField       = $articleFieldType->getField('title');

        $this->assertInstanceOf('GraphQL\Type\Definition\FieldDefinition', $titleField);
        $this->assertSame('title', $titleField->name);
        $this->assertSame(Type::string(), $titleField->getType());

        $authorField = $articleFieldType->getField('author');
        $this->assertInstanceOf('GraphQL\Type\Definition\FieldDefinition', $authorField);

        /** @var ObjectType $authorFieldType */
        $authorFieldType = $authorField->getType();
        $this->assertSame($this->blogAuthor, $authorFieldType);

        $recentArticleField = $authorFieldType->getField('recentArticle');
        $this->assertInstanceOf('GraphQL\Type\Definition\FieldDefinition', $recentArticleField);
        $this->assertSame($this->blogArticle, $recentArticleField->getType());

        $feedField = $this->blogQuery->getField('feed');
        $this->assertInstanceOf('GraphQL\Type\Definition\FieldDefinition', $feedField);

        /** @var ListOfType $feedFieldType */
        $feedFieldType = $feedField->getType();
        $this->assertInstanceOf('GraphQL\Type\Definition\ListOfType', $feedFieldType);
        $this->assertSame($this->blogArticle, $feedFieldType->getWrappedType());
    }

    /**
     * @see it('defines a mutation schema')
     */
    public function testDefinesAMutationSchema() : void
    {
        $schema = new Schema([
            'query'    => $this->blogQuery,
            'mutation' => $this->blogMutation,
        ]);

        $this->assertSame($this->blogMutation, $schema->getMutationType());
        $writeMutation = $this->blogMutation->getField('writeArticle');

        $this->assertInstanceOf('GraphQL\Type\Definition\FieldDefinition', $writeMutation);
        $this->assertSame($this->blogArticle, $writeMutation->getType());
        $this->assertSame('Article', $writeMutation->getType()->name);
        $this->assertSame('writeArticle', $writeMutation->name);
    }

    /**
     * @see it('defines a subscription schema')
     */
    public function testDefinesSubscriptionSchema() : void
    {
        $schema = new Schema([
            'query'        => $this->blogQuery,
            'subscription' => $this->blogSubscription,
        ]);

        $this->assertEquals($this->blogSubscription, $schema->getSubscriptionType());

        $sub = $this->blogSubscription->getField('articleSubscribe');
        $this->assertEquals($sub->getType(), $this->blogArticle);
        $this->assertEquals($sub->getType()->name, 'Article');
        $this->assertEquals($sub->name, 'articleSubscribe');
    }

    /**
     * @see it('defines an enum type with deprecated value')
     */
    public function testDefinesEnumTypeWithDeprecatedValue() : void
    {
        $enumTypeWithDeprecatedValue = new EnumType([
            'name'   => 'EnumWithDeprecatedValue',
            'values' => [
                'foo' => ['deprecationReason' => 'Just because'],
            ],
        ]);

        $value = $enumTypeWithDeprecatedValue->getValues()[0];

        $this->assertArraySubset(
            [
                'name'              => 'foo',
                'description'       => null,
                'deprecationReason' => 'Just because',
                'value'             => 'foo',
                'astNode'           => null,
            ],
            (array) $value
        );

        $this->assertEquals(true, $value->isDeprecated());
    }

    /**
     * @see it('defines an enum type with a value of `null` and `undefined`')
     */
    public function testDefinesAnEnumTypeWithAValueOfNullAndUndefined() : void
    {
        $EnumTypeWithNullishValue = new EnumType([
            'name'   => 'EnumWithNullishValue',
            'values' => [
                'NULL'      => ['value' => null],
                'UNDEFINED' => ['value' => null],
            ],
        ]);

        $expected = [
            [
                'name'              => 'NULL',
                'description'       => null,
                'deprecationReason' => null,
                'value'             => null,
                'astNode'           => null,
            ],
            [
                'name'              => 'UNDEFINED',
                'description'       => null,
                'deprecationReason' => null,
                'value'             => null,
                'astNode'           => null,
            ],
        ];

        $actual = $EnumTypeWithNullishValue->getValues();

        $this->assertEquals(count($expected), count($actual));
        $this->assertArraySubset($expected[0], (array) $actual[0]);
        $this->assertArraySubset($expected[1], (array) $actual[1]);
    }

    /**
     * @see it('defines an object type with deprecated field')
     */
    public function testDefinesAnObjectTypeWithDeprecatedField() : void
    {
        $TypeWithDeprecatedField = new ObjectType([
            'name'   => 'foo',
            'fields' => [
                'bar' => [
                    'type'              => Type::string(),
                    'deprecationReason' => 'A terrible reason',
                ],
            ],
        ]);

        $field = $TypeWithDeprecatedField->getField('bar');

        $this->assertEquals(Type::string(), $field->getType());
        $this->assertEquals(true, $field->isDeprecated());
        $this->assertEquals('A terrible reason', $field->deprecationReason);
        $this->assertEquals('bar', $field->name);
        $this->assertEquals([], $field->args);
    }

    /**
     * @see it('includes nested input objects in the map')
     */
    public function testIncludesNestedInputObjectInTheMap() : void
    {
        $nestedInputObject = new InputObjectType([
            'name'   => 'NestedInputObject',
            'fields' => ['value' => ['type' => Type::string()]],
        ]);
        $someInputObject   = new InputObjectType([
            'name'   => 'SomeInputObject',
            'fields' => ['nested' => ['type' => $nestedInputObject]],
        ]);
        $someMutation      = new ObjectType([
            'name'   => 'SomeMutation',
            'fields' => [
                'mutateSomething' => [
                    'type' => $this->blogArticle,
                    'args' => ['input' => ['type' => $someInputObject]],
                ],
            ],
        ]);

        $schema = new Schema([
            'query'    => $this->blogQuery,
            'mutation' => $someMutation,
        ]);
        $this->assertSame($nestedInputObject, $schema->getType('NestedInputObject'));
    }

    /**
     * @see it('includes interface possible types in the type map')
     */
    public function testIncludesInterfaceSubtypesInTheTypeMap() : void
    {
        $someInterface = new InterfaceType([
            'name'   => 'SomeInterface',
            'fields' => [
                'f' => ['type' => Type::int()],
            ],
        ]);

        $someSubtype = new ObjectType([
            'name'       => 'SomeSubtype',
            'fields'     => [
                'f' => ['type' => Type::int()],
            ],
            'interfaces' => [$someInterface],
        ]);

        $schema = new Schema([
            'query' => new ObjectType([
                'name'   => 'Query',
                'fields' => [
                    'iface' => ['type' => $someInterface],
                ],
            ]),
            'types' => [$someSubtype],
        ]);
        $this->assertSame($someSubtype, $schema->getType('SomeSubtype'));
    }

    /**
     * @see it('includes interfaces' thunk subtypes in the type map')
     */
    public function testIncludesInterfacesThunkSubtypesInTheTypeMap() : void
    {
        $someInterface = null;

        $someSubtype = new ObjectType([
            'name'       => 'SomeSubtype',
            'fields'     => [
                'f' => ['type' => Type::int()],
            ],
            'interfaces' => function () use (&$someInterface) {
                return [$someInterface];
            },
        ]);

        $someInterface = new InterfaceType([
            'name'   => 'SomeInterface',
            'fields' => [
                'f' => ['type' => Type::int()],
            ],
        ]);

        $schema = new Schema([
            'query' => new ObjectType([
                'name'   => 'Query',
                'fields' => [
                    'iface' => ['type' => $someInterface],
                ],
            ]),
            'types' => [$someSubtype],
        ]);

        $this->assertSame($someSubtype, $schema->getType('SomeSubtype'));
    }

    /**
     * @see it('stringifies simple types')
     */
    public function testStringifiesSimpleTypes() : void
    {
        $this->assertSame('Int', (string) Type::int());
        $this->assertSame('Article', (string) $this->blogArticle);

        $this->assertSame('Interface', (string) $this->interfaceType);
        $this->assertSame('Union', (string) $this->unionType);
        $this->assertSame('Enum', (string) $this->enumType);
        $this->assertSame('InputObject', (string) $this->inputObjectType);
        $this->assertSame('Object', (string) $this->objectType);

        $this->assertSame('Int!', (string) new NonNull(Type::int()));
        $this->assertSame('[Int]', (string) new ListOfType(Type::int()));
        $this->assertSame('[Int]!', (string) new NonNull(new ListOfType(Type::int())));
        $this->assertSame('[Int!]', (string) new ListOfType(new NonNull(Type::int())));
        $this->assertSame('[[Int]]', (string) new ListOfType(new ListOfType(Type::int())));
    }

    /**
     * @see it('JSON stringifies simple types')
     */
    public function testJSONStringifiesSimpleTypes() : void
    {
        $this->assertEquals('"Int"', json_encode(Type::int()));
        $this->assertEquals('"Article"', json_encode($this->blogArticle));
        $this->assertEquals('"Interface"', json_encode($this->interfaceType));
        $this->assertEquals('"Union"', json_encode($this->unionType));
        $this->assertEquals('"Enum"', json_encode($this->enumType));
        $this->assertEquals('"InputObject"', json_encode($this->inputObjectType));
        $this->assertEquals('"Int!"', json_encode(Type::nonNull(Type::int())));
        $this->assertEquals('"[Int]"', json_encode(Type::listOf(Type::int())));
        $this->assertEquals('"[Int]!"', json_encode(Type::nonNull(Type::listOf(Type::int()))));
        $this->assertEquals('"[Int!]"', json_encode(Type::listOf(Type::nonNull(Type::int()))));
        $this->assertEquals('"[[Int]]"', json_encode(Type::listOf(Type::listOf(Type::int()))));
    }

    /**
     * @see it('identifies input types')
     */
    public function testIdentifiesInputTypes() : void
    {
        $expected = [
            [Type::int(), true],
            [$this->objectType, false],
            [$this->interfaceType, false],
            [$this->unionType, false],
            [$this->enumType, true],
            [$this->inputObjectType, true],
        ];

        foreach ($expected as $index => $entry) {
            $this->assertSame(
                $entry[1],
                Type::isInputType($entry[0]),
                sprintf('Type %s was detected incorrectly', $entry[0])
            );
        }
    }

    /**
     * @see it('identifies output types')
     */
    public function testIdentifiesOutputTypes() : void
    {
        $expected = [
            [Type::int(), true],
            [$this->objectType, true],
            [$this->interfaceType, true],
            [$this->unionType, true],
            [$this->enumType, true],
            [$this->inputObjectType, false],
        ];

        foreach ($expected as $index => $entry) {
            $this->assertSame(
                $entry[1],
                Type::isOutputType($entry[0]),
                sprintf('Type %s was detected incorrectly', $entry[0])
            );
        }
    }

    /**
     * @see it('prohibits nesting NonNull inside NonNull')
     */
    public function testProhibitsNestingNonNullInsideNonNull() : void
    {
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'Expected Int! to be a GraphQL nullable type.'
        );
        Type::nonNull(Type::nonNull(Type::int()));
    }

    /**
     * @see it('allows a thunk for Union member types')
     */
    public function testAllowsThunkForUnionTypes() : void
    {
        $union = new UnionType([
            'name'  => 'ThunkUnion',
            'types' => function () {
                return [$this->objectType];
            },
        ]);

        $types = $union->getTypes();
        $this->assertEquals(1, count($types));
        $this->assertSame($this->objectType, $types[0]);
    }

    public function testAllowsRecursiveDefinitions() : void
    {
        // See https://github.com/webonyx/graphql-php/issues/16
        $node = new InterfaceType([
            'name'   => 'Node',
            'fields' => [
                'id' => ['type' => Type::nonNull(Type::id())],
            ],
        ]);

        $blog   = null;
        $called = false;

        $user = new ObjectType([
            'name'       => 'User',
            'fields'     => function () use (&$blog, &$called) {
                $this->assertNotNull($blog, 'Blog type is expected to be defined at this point, but it is null');
                $called = true;

                return [
                    'id'    => ['type' => Type::nonNull(Type::id())],
                    'blogs' => ['type' => Type::nonNull(Type::listOf(Type::nonNull($blog)))],
                ];
            },
            'interfaces' => function () use ($node) {
                return [$node];
            },
        ]);

        $blog = new ObjectType([
            'name'       => 'Blog',
            'fields'     => function () use ($user) {
                return [
                    'id'    => ['type' => Type::nonNull(Type::id())],
                    'owner' => ['type' => Type::nonNull($user)],
                ];
            },
            'interfaces' => function () use ($node) {
                return [$node];
            },
        ]);

        $schema = new Schema([
            'query' => new ObjectType([
                'name'   => 'Query',
                'fields' => [
                    'node' => ['type' => $node],
                ],
            ]),
            'types' => [$user, $blog],
        ]);

        $this->assertTrue($called);
        $schema->getType('Blog');

        $this->assertEquals([$node], $blog->getInterfaces());
        $this->assertEquals([$node], $user->getInterfaces());

        $this->assertNotNull($user->getField('blogs'));
        $this->assertSame($blog, $user->getField('blogs')->getType()->getWrappedType(true));

The method getWrappedType() does not exist on GraphQL\Type\Definition\Type. It seems like you code against a sub-type of GraphQL\Type\Definition\Type such as GraphQL\Type\Definition\ListOfType or GraphQL\Type\Definition\NonNull.

        $this->assertNotNull($blog->getField('owner'));
        $this->assertSame($user, $blog->getField('owner')->getType()->getWrappedType(true));
    }

    public function testInputObjectTypeAllowsRecursiveDefinitions() : void
    {
        $called      = false;
        $inputObject = new InputObjectType([
            'name'   => 'InputObject',
            'fields' => function () use (&$inputObject, &$called) {
                $called = true;

                return [
                    'value'  => ['type' => Type::string()],
                    'nested' => ['type' => $inputObject],
                ];
            },
        ]);

        $someMutation = new ObjectType([
            'name'   => 'SomeMutation',
            'fields' => [
                'mutateSomething' => [
                    'type' => $this->blogArticle,
                    'args' => ['input' => ['type' => $inputObject]],
                ],
            ],
        ]);

        $schema = new Schema([
            'query'    => $this->blogQuery,
            'mutation' => $someMutation,
        ]);

        $this->assertSame($inputObject, $schema->getType('InputObject'));
        $this->assertTrue($called);
        $this->assertEquals(count($inputObject->getFields()), 2);
        $this->assertSame($inputObject->getField('nested')->getType(), $inputObject);
        $this->assertSame($someMutation->getField('mutateSomething')->getArg('input')->getType(), $inputObject);
    }

    public function testInterfaceTypeAllowsRecursiveDefinitions() : void
    {
        $called    = false;
        $interface = new InterfaceType([
            'name'   => 'SomeInterface',
            'fields' => function () use (&$interface, &$called) {
                $called = true;

                return [
                    'value'  => ['type' => Type::string()],
                    'nested' => ['type' => $interface],
                ];
            },
        ]);

        $query = new ObjectType([
            'name'   => 'Query',
            'fields' => [
                'test' => ['type' => $interface],
            ],
        ]);

        $schema = new Schema(['query' => $query]);

        $this->assertSame($interface, $schema->getType('SomeInterface'));
        $this->assertTrue($called);
        $this->assertEquals(count($interface->getFields()), 2);
        $this->assertSame($interface->getField('nested')->getType(), $interface);
        $this->assertSame($interface->getField('value')->getType(), Type::string());
    }

    public function testAllowsShorthandFieldDefinition() : void
    {
        $interface = new InterfaceType([
            'name'   => 'SomeInterface',
            'fields' => function () use (&$interface) {
                return [
                    'value'   => Type::string(),
                    'nested'  => $interface,
                    'withArg' => [
                        'type' => Type::string(),
                        'args' => [
                            'arg1' => Type::int(),
                        ],
                    ],
                ];
            },
        ]);

        $query = new ObjectType([
            'name'   => 'Query',
            'fields' => ['test' => $interface],
        ]);

        $schema = new Schema(['query' => $query]);

        $valueField  = $schema->getType('SomeInterface')->getField('value');

The method getField() does not exist on GraphQL\Type\Definition\Type. It seems like you code against a sub-type of GraphQL\Type\Definition\Type such as GraphQL\Type\Definition\InterfaceType or GraphQL\Type\Definition\ObjectType or GraphQL\Type\Definition\InputObjectType.

        $nestedField = $schema->getType('SomeInterface')->getField('nested');

        $this->assertEquals(Type::string(), $valueField->getType());
        $this->assertEquals($interface, $nestedField->getType());

        $withArg = $schema->getType('SomeInterface')->getField('withArg');
        $this->assertEquals(Type::string(), $withArg->getType());

        $this->assertEquals('arg1', $withArg->args[0]->name);
        $this->assertEquals(Type::int(), $withArg->args[0]->getType());

        $testField = $schema->getType('Query')->getField('test');
        $this->assertEquals($interface, $testField->getType());
        $this->assertEquals('test', $testField->name);
    }

    public function testInfersNameFromClassname() : void
    {
        $myObj = new MyCustomType();
        $this->assertEquals('MyCustom', $myObj->name);

        $otherCustom = new OtherCustom();
        $this->assertEquals('OtherCustom', $otherCustom->name);
    }

    public function testAllowsOverridingInternalTypes() : void
    {
        $idType = new CustomScalarType([
            'name'         => 'ID',
            'serialize'    => function () {
            },
            'parseValue'   => function () {
            },
            'parseLiteral' => function () {
            },
        ]);

        $schema = new Schema([
            'query' => new ObjectType(['name' => 'Query', 'fields' => []]),
            'types' => [$idType],
        ]);

        $this->assertSame($idType, $schema->getType('ID'));
    }

    // Field config must be object

    /**
     * @see it('accepts an Object type with a field function')
     */
    public function testAcceptsAnObjectTypeWithAFieldFunction() : void
    {
        $objType = new ObjectType([
            'name'   => 'SomeObject',
            'fields' => function () {
                return [
                    'f' => ['type' => Type::string()],
                ];
            },
        ]);
        $objType->assertValid(true);

The call to GraphQL\Type\Definition\ObjectType::assertValid() has too many arguments starting with true.

        $this->assertSame(Type::string(), $objType->getField('f')->getType());
    }

    /**
     * @see it('rejects an Object type field with undefined config')
     */
    public function testRejectsAnObjectTypeFieldWithUndefinedConfig() : void
    {
        $objType = new ObjectType([
            'name'   => 'SomeObject',
            'fields' => ['f' => null],
        ]);
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'SomeObject.f field config must be an array, but got: null'
        );
        $objType->getFields();
    }

    /**
     * @see it('rejects an Object type with incorrectly typed fields')
     */
    public function testRejectsAnObjectTypeWithIncorrectlyTypedFields() : void
    {
        $objType = new ObjectType([
            'name'   => 'SomeObject',
            'fields' => [['field' => Type::string()]],
        ]);
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'SomeObject fields must be an associative array with field names as keys or a ' .
            'function which returns such an array.'
        );
        $objType->getFields();
    }

    /**
     * @see it('rejects an Object type with a field function that returns incorrect type')
     */
    public function testRejectsAnObjectTypeWithAFieldFunctionThatReturnsIncorrectType() : void
    {
        $objType = new ObjectType([
            'name'   => 'SomeObject',
            'fields' => function () {
                return [['field' => Type::string()]];
            },
        ]);
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'SomeObject fields must be an associative array with field names as keys or a ' .
            'function which returns such an array.'
        );
        $objType->getFields();
    }

    // Field arg config must be object

    /**
     * @see it('accepts an Object type with field args')
     */
    public function testAcceptsAnObjectTypeWithFieldArgs() : void
    {
        $this->expectNotToPerformAssertions();
        $objType = new ObjectType([
            'name'   => 'SomeObject',
            'fields' => [
                'goodField' => [
                    'type' => Type::string(),
                    'args' => [
                        'goodArg' => ['type' => Type::string()],
                    ],
                ],
            ],
        ]);
        // Should not throw:
        $objType->assertValid();
    }

    // rejects an Object type with incorrectly typed field args

    /**
     * @see it('does not allow isDeprecated without deprecationReason on field')
     */
    public function testDoesNotAllowIsDeprecatedWithoutDeprecationReasonOnField() : void
    {
        $OldObject = new ObjectType([
            'name'   => 'OldObject',
            'fields' => [
                'field' => [
                    'type'         => Type::string(),
                    'isDeprecated' => true,
                ],
            ],
        ]);

        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'OldObject.field should provide "deprecationReason" instead of "isDeprecated".'
        );
        $OldObject->assertValid();
    }

    // Object interfaces must be array

    /**
     * @see it('accepts an Object type with array interfaces')
     */
    public function testAcceptsAnObjectTypeWithArrayInterfaces() : void
    {
        $objType = new ObjectType([
            'name'       => 'SomeObject',
            'interfaces' => [$this->interfaceType],
            'fields'     => ['f' => ['type' => Type::string()]],
        ]);
        $this->assertSame($this->interfaceType, $objType->getInterfaces()[0]);
    }

    /**
     * @see it('accepts an Object type with interfaces as a function returning an array')
     */
    public function testAcceptsAnObjectTypeWithInterfacesAsAFunctionReturningAnArray() : void
    {
        $objType = new ObjectType([
            'name'       => 'SomeObject',
            'interfaces' => function () {
                return [$this->interfaceType];
            },
            'fields'     => ['f' => ['type' => Type::string()]],
        ]);
        $this->assertSame($this->interfaceType, $objType->getInterfaces()[0]);
    }

    /**
     * @see it('rejects an Object type with incorrectly typed interfaces')
     */
    public function testRejectsAnObjectTypeWithIncorrectlyTypedInterfaces() : void
    {
        $objType = new ObjectType([
            'name'       => 'SomeObject',
            'interfaces' => new \stdClass(),
            'fields'     => ['f' => ['type' => Type::string()]],
        ]);
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'SomeObject interfaces must be an Array or a callable which returns an Array.'
        );
        $objType->getInterfaces();
    }

    /**
     * @see it('rejects an Object type with interfaces as a function returning an incorrect type')
     */
    public function testRejectsAnObjectTypeWithInterfacesAsAFunctionReturningAnIncorrectType() : void
    {
        $objType = new ObjectType([
            'name'       => 'SomeObject',
            'interfaces' => function () {
                return new \stdClass();
            },
            'fields'     => ['f' => ['type' => Type::string()]],
        ]);
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'SomeObject interfaces must be an Array or a callable which returns an Array.'
        );
        $objType->getInterfaces();
    }

    // Type System: Object fields must have valid resolve values

    /**
     * @see it('accepts a lambda as an Object field resolver')
     */
    public function testAcceptsALambdaAsAnObjectFieldResolver() : void
    {
        $this->expectNotToPerformAssertions();
        // should not throw:
        $this->schemaWithObjectWithFieldResolver(function () {
        });
    }

    private function schemaWithObjectWithFieldResolver($resolveValue)
    {
        $BadResolverType = new ObjectType([
            'name'   => 'BadResolver',
            'fields' => [
                'badField' => [
                    'type'    => Type::string(),
                    'resolve' => $resolveValue,
                ],
            ],
        ]);

        $schema = new Schema([
            'query' => new ObjectType([
                'name'   => 'Query',
                'fields' => [
                    'f' => ['type' => $BadResolverType],
                ],
            ]),
        ]);
        $schema->assertValid();

        return $schema;
    }

    /**
     * @see it('rejects an empty Object field resolver')
     */
    public function testRejectsAnEmptyObjectFieldResolver() : void
    {
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'BadResolver.badField field resolver must be a function if provided, but got: []'
        );
        $this->schemaWithObjectWithFieldResolver([]);
    }

    /**
     * @see it('rejects a constant scalar value resolver')
     */
    public function testRejectsAConstantScalarValueResolver() : void
    {
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'BadResolver.badField field resolver must be a function if provided, but got: 0'
        );
        $this->schemaWithObjectWithFieldResolver(0);
    }

    // Type System: Interface types must be resolvable

    /**
     * @see it('accepts an Interface type defining resolveType')
     */
    public function testAcceptsAnInterfaceTypeDefiningResolveType() : void
    {
        $this->expectNotToPerformAssertions();
        $AnotherInterfaceType = new InterfaceType([
            'name'   => 'AnotherInterface',
            'fields' => ['f' => ['type' => Type::string()]],
        ]);

        // Should not throw:
        $this->schemaWithFieldType(
            new ObjectType([
                'name'       => 'SomeObject',
                'interfaces' => [$AnotherInterfaceType],
                'fields'     => ['f' => ['type' => Type::string()]],
            ])
        );
    }

    private function schemaWithFieldType($type)
    {
        $schema = new Schema([
            'query' => new ObjectType([
                'name'   => 'Query',
                'fields' => ['field' => ['type' => $type]],
            ]),
            'types' => [$type],
        ]);
        $schema->assertValid();

        return $schema;
    }

    /**
     * @see it('accepts an Interface with implementing type defining isTypeOf')
     */
    public function testAcceptsAnInterfaceWithImplementingTypeDefiningIsTypeOf() : void
    {
        $this->expectNotToPerformAssertions();
        $InterfaceTypeWithoutResolveType = new InterfaceType([
            'name'   => 'InterfaceTypeWithoutResolveType',
            'fields' => ['f' => ['type' => Type::string()]],
        ]);

        // Should not throw:
        $this->schemaWithFieldType(
            new ObjectType([
                'name'       => 'SomeObject',
                'interfaces' => [$InterfaceTypeWithoutResolveType],
                'fields'     => ['f' => ['type' => Type::string()]],
            ])
        );
    }

    /**
     * @see it('accepts an Interface type defining resolveType with implementing type defining isTypeOf')
     */
    public function testAcceptsAnInterfaceTypeDefiningResolveTypeWithImplementingTypeDefiningIsTypeOf() : void
    {
        $this->expectNotToPerformAssertions();
        $AnotherInterfaceType = new InterfaceType([
            'name'   => 'AnotherInterface',
            'fields' => ['f' => ['type' => Type::string()]],
        ]);

        // Should not throw:
        $this->schemaWithFieldType(
            new ObjectType([
                'name'       => 'SomeObject',
                'interfaces' => [$AnotherInterfaceType],
                'fields'     => ['f' => ['type' => Type::string()]],
            ])
        );
    }

    /**
     * @see it('rejects an Interface type with an incorrect type for resolveType')
     */
    public function testRejectsAnInterfaceTypeWithAnIncorrectTypeForResolveType() : void
    {
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'AnotherInterface must provide "resolveType" as a function, but got: instance of stdClass'
        );

        $type = new InterfaceType([
            'name'        => 'AnotherInterface',
            'resolveType' => new \stdClass(),
            'fields'      => ['f' => ['type' => Type::string()]],
        ]);
        $type->assertValid();
    }

    // Type System: Union types must be resolvable

    /**
     * @see it('accepts a Union type defining resolveType')
     */
    public function testAcceptsAUnionTypeDefiningResolveType() : void
    {
        $this->expectNotToPerformAssertions();
        // Should not throw:
        $this->schemaWithFieldType(
            new UnionType([
                'name'  => 'SomeUnion',
                'types' => [$this->objectType],
            ])
        );
    }

    /**
     * @see it('accepts a Union of Object types defining isTypeOf')
     */
    public function testAcceptsAUnionOfObjectTypesDefiningIsTypeOf() : void
    {
        $this->expectNotToPerformAssertions();
        // Should not throw:
        $this->schemaWithFieldType(
            new UnionType([
                'name'  => 'SomeUnion',
                'types' => [$this->objectWithIsTypeOf],
            ])
        );
    }

    /**
     * @see it('accepts a Union type defining resolveType of Object types defining isTypeOf')
     */
    public function testAcceptsAUnionTypeDefiningResolveTypeOfObjectTypesDefiningIsTypeOf() : void
    {
        $this->expectNotToPerformAssertions();
        // Should not throw:
        $this->schemaWithFieldType(
            new UnionType([
                'name'  => 'SomeUnion',
                'types' => [$this->objectWithIsTypeOf],
            ])
        );
    }

    /**
     * @see it('rejects an Union type with an incorrect type for resolveType')
     */
    public function testRejectsAnUnionTypeWithAnIncorrectTypeForResolveType() : void
    {
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'SomeUnion must provide "resolveType" as a function, but got: instance of stdClass'
        );
        $this->schemaWithFieldType(
            new UnionType([
                'name'        => 'SomeUnion',
                'resolveType' => new \stdClass(),
                'types'       => [$this->objectWithIsTypeOf],
            ])
        );
    }

    /**
     * @see it('accepts a Scalar type defining serialize')
     */
    public function testAcceptsAScalarTypeDefiningSerialize() : void
    {
        $this->expectNotToPerformAssertions();
        // Should not throw
        $this->schemaWithFieldType(
            new CustomScalarType([
                'name'      => 'SomeScalar',
                'serialize' => function () {
                    return null;
                },
            ])
        );
    }

    // Type System: Scalar types must be serializable

    /**
     * @see it('rejects a Scalar type not defining serialize')
     */
    public function testRejectsAScalarTypeNotDefiningSerialize() : void
    {
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'SomeScalar must provide "serialize" function. If this custom Scalar ' .
            'is also used as an input type, ensure "parseValue" and "parseLiteral" ' .
            'functions are also provided.'
        );
        $this->schemaWithFieldType(
            new CustomScalarType(['name' => 'SomeScalar'])
        );
    }

    /**
     * @see it('rejects a Scalar type defining serialize with an incorrect type')
     */
    public function testRejectsAScalarTypeDefiningSerializeWithAnIncorrectType() : void
    {
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'SomeScalar must provide "serialize" function. If this custom Scalar ' .
            'is also used as an input type, ensure "parseValue" and "parseLiteral" ' .
            'functions are also provided.'
        );
        $this->schemaWithFieldType(
            new CustomScalarType([
                'name'      => 'SomeScalar',
                'serialize' => new \stdClass(),
            ])
        );
    }

    /**
     * @see it('accepts a Scalar type defining parseValue and parseLiteral')
     */
    public function testAcceptsAScalarTypeDefiningParseValueAndParseLiteral() : void
    {
        $this->expectNotToPerformAssertions();
        // Should not throw:
        $this->schemaWithFieldType(
            new CustomScalarType([
                'name'         => 'SomeScalar',
                'serialize'    => function () {
                },
                'parseValue'   => function () {
                },
                'parseLiteral' => function () {
                },
            ])
        );
    }

    /**
     * @see it('rejects a Scalar type defining parseValue but not parseLiteral')
     */
    public function testRejectsAScalarTypeDefiningParseValueButNotParseLiteral() : void
    {
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'SomeScalar must provide both "parseValue" and "parseLiteral" functions.'
        );
        $this->schemaWithFieldType(
            new CustomScalarType([
                'name'       => 'SomeScalar',
                'serialize'  => function () {
                },
                'parseValue' => function () {
                },
            ])
        );
    }

    /**
     * @see it('rejects a Scalar type defining parseLiteral but not parseValue')
     */
    public function testRejectsAScalarTypeDefiningParseLiteralButNotParseValue() : void
    {
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'SomeScalar must provide both "parseValue" and "parseLiteral" functions.'
        );
        $this->schemaWithFieldType(
            new CustomScalarType([
                'name'         => 'SomeScalar',
                'serialize'    => function () {
                },
                'parseLiteral' => function () {
                },
            ])
        );
    }

    /**
     * @see it('rejects a Scalar type defining parseValue and parseLiteral with an incorrect type')
     */
    public function testRejectsAScalarTypeDefiningParseValueAndParseLiteralWithAnIncorrectType() : void
    {
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'SomeScalar must provide both "parseValue" and "parseLiteral" functions.'
        );
        $this->schemaWithFieldType(
            new CustomScalarType([
                'name'         => 'SomeScalar',
                'serialize'    => function () {
                },
                'parseValue'   => new \stdClass(),
                'parseLiteral' => new \stdClass(),
            ])
        );
    }

    /**
     * @see it('accepts an Object type with an isTypeOf function')
     */
    public function testAcceptsAnObjectTypeWithAnIsTypeOfFunction() : void
    {
        $this->expectNotToPerformAssertions();
        // Should not throw
        $this->schemaWithFieldType(
            new ObjectType([
                'name'   => 'AnotherObject',
                'fields' => ['f' => ['type' => Type::string()]],
            ])
        );
    }

    // Type System: Object types must be assertable

    /**
     * @see it('rejects an Object type with an incorrect type for isTypeOf')
     */
    public function testRejectsAnObjectTypeWithAnIncorrectTypeForIsTypeOf() : void
    {
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'AnotherObject must provide "isTypeOf" as a function, but got: instance of stdClass'
        );
        $this->schemaWithFieldType(
            new ObjectType([
                'name'     => 'AnotherObject',
                'isTypeOf' => new \stdClass(),
                'fields'   => ['f' => ['type' => Type::string()]],
            ])
        );
    }

    /**
     * @see it('accepts a Union type with array types')
     */
    public function testAcceptsAUnionTypeWithArrayTypes() : void
    {
        $this->expectNotToPerformAssertions();
        // Should not throw:
        $this->schemaWithFieldType(
            new UnionType([
                'name'  => 'SomeUnion',
                'types' => [$this->objectType],
            ])
        );
    }

    // Type System: Union types must be array

    /**
     * @see it('accepts a Union type with function returning an array of types')
     */
    public function testAcceptsAUnionTypeWithFunctionReturningAnArrayOfTypes() : void
    {
        $this->expectNotToPerformAssertions();
        $this->schemaWithFieldType(
            new UnionType([
                'name'  => 'SomeUnion',
                'types' => function () {
                    return [$this->objectType];
                },
            ])
        );
    }

    /**
     * @see it('rejects a Union type without types')
     */
    public function testRejectsAUnionTypeWithoutTypes() : void
    {
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'Must provide Array of types or a callable which returns such an array for Union SomeUnion'
        );
        $this->schemaWithFieldType(
            new UnionType(['name' => 'SomeUnion'])
        );
    }

    /**
     * @see it('rejects a Union type with incorrectly typed types')
     */
    public function testRejectsAUnionTypeWithIncorrectlyTypedTypes() : void
    {
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'Must provide Array of types or a callable which returns such an array for Union SomeUnion'
        );
        $this->schemaWithFieldType(
            new UnionType([
                'name'  => 'SomeUnion',
                'types' => (object) ['test' => $this->objectType],
            ])
        );
    }

    /**
     * @see it('accepts an Input Object type with fields')
     */
    public function testAcceptsAnInputObjectTypeWithFields() : void
    {
        $inputObjType = new InputObjectType([
            'name'   => 'SomeInputObject',
            'fields' => [
                'f' => ['type' => Type::string()],
            ],
        ]);
        $inputObjType->assertValid();
        $this->assertSame(Type::string(), $inputObjType->getField('f')->getType());
    }

    // Type System: Input Objects must have fields

    /**
     * @see it('accepts an Input Object type with a field function')
     */
    public function testAcceptsAnInputObjectTypeWithAFieldFunction() : void
    {
        $inputObjType = new InputObjectType([
            'name'   => 'SomeInputObject',
            'fields' => function () {
                return [
                    'f' => ['type' => Type::string()],
                ];
            },
        ]);
        $inputObjType->assertValid();
        $this->assertSame(Type::string(), $inputObjType->getField('f')->getType());
    }

    /**
     * @see it('rejects an Input Object type with incorrect fields')
     */
    public function testRejectsAnInputObjectTypeWithIncorrectFields() : void
    {
        $inputObjType = new InputObjectType([
            'name'   => 'SomeInputObject',
            'fields' => [],
        ]);
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'SomeInputObject fields must be an associative array with field names as keys or a callable ' .
            'which returns such an array.'
        );
        $inputObjType->assertValid();
    }

    /**
     * @see it('rejects an Input Object type with fields function that returns incorrect type')
     */
    public function testRejectsAnInputObjectTypeWithFieldsFunctionThatReturnsIncorrectType() : void
    {
        $inputObjType = new InputObjectType([
            'name'   => 'SomeInputObject',
            'fields' => function () {
                return [];
            },
        ]);
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'SomeInputObject fields must be an associative array with field names as keys or a ' .
            'callable which returns such an array.'
        );
        $inputObjType->assertValid();
    }

    /**
     * @see it('rejects an Input Object type with resolvers')
     */
    public function testRejectsAnInputObjectTypeWithResolvers() : void
    {
        $inputObjType = new InputObjectType([
            'name'   => 'SomeInputObject',
            'fields' => [
                'f' => [
                    'type'    => Type::string(),
                    'resolve' => function () {
                        return 0;
                    },
                ],
            ],
        ]);
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'SomeInputObject.f field type has a resolve property, ' .
            'but Input Types cannot define resolvers.'
        );
        $inputObjType->assertValid();
    }

    // Type System: Input Object fields must not have resolvers

    /**
     * @see it('rejects an Input Object type with resolver constant')
     */
    public function testRejectsAnInputObjectTypeWithResolverConstant() : void
    {
        $inputObjType = new InputObjectType([
            'name'   => 'SomeInputObject',
            'fields' => [
                'f' => [
                    'type'    => Type::string(),
                    'resolve' => new \stdClass(),
                ],
            ],
        ]);
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'SomeInputObject.f field type has a resolve property, ' .
            'but Input Types cannot define resolvers.'
        );
        $inputObjType->assertValid();
    }

    /**
     * @see it('accepts a well defined Enum type with empty value definition')
     */
    public function testAcceptsAWellDefinedEnumTypeWithEmptyValueDefinition() : void
    {
        $enumType = new EnumType([
            'name'   => 'SomeEnum',
            'values' => [
                'FOO' => [],
                'BAR' => [],
            ],
        ]);
        $this->assertEquals('FOO', $enumType->getValue('FOO')->value);
        $this->assertEquals('BAR', $enumType->getValue('BAR')->value);
    }

    // Type System: Enum types must be well defined

    /**
     * @see it('accepts a well defined Enum type with internal value definition')
     */
    public function testAcceptsAWellDefinedEnumTypeWithInternalValueDefinition() : void
    {
        $enumType = new EnumType([
            'name'   => 'SomeEnum',
            'values' => [
                'FOO' => ['value' => 10],
                'BAR' => ['value' => 20],
            ],
        ]);
        $this->assertEquals(10, $enumType->getValue('FOO')->value);
        $this->assertEquals(20, $enumType->getValue('BAR')->value);
    }

    /**
     * @see it('rejects an Enum type with incorrectly typed values')
     */
    public function testRejectsAnEnumTypeWithIncorrectlyTypedValues() : void
    {
        $enumType = new EnumType([
            'name'   => 'SomeEnum',
            'values' => [['FOO' => 10]],
        ]);
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'SomeEnum values must be an array with value names as keys.'
        );
        $enumType->assertValid();
    }

    /**
     * @see it('does not allow isDeprecated without deprecationReason on enum')
     */
    public function testDoesNotAllowIsDeprecatedWithoutDeprecationReasonOnEnum() : void
    {
        $enumType = new EnumType([
            'name'   => 'SomeEnum',
            'values' => [
                'FOO' => ['isDeprecated' => true],
            ],
        ]);
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'SomeEnum.FOO should provide "deprecationReason" instead ' .
            'of "isDeprecated".'
        );
        $enumType->assertValid();
    }

    /**
     * Type System: List must accept only types
     */
    public function testListMustAcceptOnlyTypes() : void
    {
        $types = [
            Type::string(),
            $this->scalarType,
            $this->objectType,
            $this->unionType,
            $this->interfaceType,
            $this->enumType,
            $this->inputObjectType,
            Type::listOf(Type::string()),
            Type::nonNull(Type::string()),
        ];

        $badTypes = [[], new \stdClass(), '', null];

        foreach ($types as $type) {
            try {
                Type::listOf($type);
            } catch (\Throwable $e) {
                $this->fail('List is expected to accept type: ' . get_class($type) . ', but got error: ' . $e->getMessage());
            }
        }
        foreach ($badTypes as $badType) {
            $typeStr = Utils::printSafe($badType);
            try {
                Type::listOf($badType);
                $this->fail(sprintf('List should not accept %s', $typeStr));
            } catch (InvariantViolation $e) {
                $this->assertEquals(sprintf('Expected %s to be a GraphQL type.', $typeStr), $e->getMessage());
            }
        }
    }

    /**
     * Type System: NonNull must only accept non-nullable types
     */
    public function testNonNullMustOnlyAcceptNonNullableTypes() : void
    {
        $nullableTypes    = [
            Type::string(),
            $this->scalarType,
            $this->objectType,
            $this->unionType,
            $this->interfaceType,
            $this->enumType,
            $this->inputObjectType,
            Type::listOf(Type::string()),
            Type::listOf(Type::nonNull(Type::string())),
        ];
        $notNullableTypes = [
            Type::nonNull(Type::string()),
            [],
            new \stdClass(),
            '',
            null,
        ];
        foreach ($nullableTypes as $type) {
            try {
                Type::nonNull($type);
            } catch (\Throwable $e) {
                $this->fail('NonNull is expected to accept type: ' . get_class($type) . ', but got error: ' . $e->getMessage());
            }
        }
        foreach ($notNullableTypes as $badType) {
            $typeStr = Utils::printSafe($badType);
            try {
                Type::nonNull($badType);
                $this->fail(sprintf('Nulls should not accept %s', $typeStr));
            } catch (InvariantViolation $e) {
                $this->assertEquals(sprintf('Expected %s to be a GraphQL nullable type.', $typeStr), $e->getMessage());
            }
        }
    }

    /**
     * @see it('rejects a Schema which redefines a built-in type')
     */
    public function testRejectsASchemaWhichRedefinesABuiltInType() : void
    {
        $FakeString = new CustomScalarType([
            'name'      => 'String',
            'serialize' => function () {
            },
        ]);

        $QueryType = new ObjectType([
            'name'   => 'Query',
            'fields' => [
                'normal' => ['type' => Type::string()],
                'fake'   => ['type' => $FakeString],
            ],
        ]);

        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'Schema must contain unique named types but contains multiple types named "String" ' .
            '(see http://webonyx.github.io/graphql-php/type-system/#type-registry).'
        );
        $schema = new Schema(['query' => $QueryType]);
        $schema->assertValid();
    }

    // Type System: A Schema must contain uniquely named types

    /**
     * @see it('rejects a Schema which defines an object type twice')
     */
    public function testRejectsASchemaWhichDefinesAnObjectTypeTwice() : void
    {
        $A = new ObjectType([
            'name'   => 'SameName',
            'fields' => ['f' => ['type' => Type::string()]],
        ]);

        $B = new ObjectType([
            'name'   => 'SameName',
            'fields' => ['f' => ['type' => Type::string()]],
        ]);

        $QueryType = new ObjectType([
            'name'   => 'Query',
            'fields' => [
                'a' => ['type' => $A],
                'b' => ['type' => $B],
            ],
        ]);
        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'Schema must contain unique named types but contains multiple types named "SameName" ' .
            '(see http://webonyx.github.io/graphql-php/type-system/#type-registry).'
        );
        $schema = new Schema(['query' => $QueryType]);
        $schema->assertValid();
    }

    /**
     * @see it('rejects a Schema which have same named objects implementing an interface')
     */
    public function testRejectsASchemaWhichHaveSameNamedObjectsImplementingAnInterface() : void
    {
        $AnotherInterface = new InterfaceType([
            'name'   => 'AnotherInterface',
            'fields' => ['f' => ['type' => Type::string()]],
        ]);

        $FirstBadObject = new ObjectType([
            'name'       => 'BadObject',
            'interfaces' => [$AnotherInterface],
            'fields'     => ['f' => ['type' => Type::string()]],
        ]);

        $SecondBadObject = new ObjectType([
            'name'       => 'BadObject',
            'interfaces' => [$AnotherInterface],
            'fields'     => ['f' => ['type' => Type::string()]],
        ]);

        $QueryType = new ObjectType([
            'name'   => 'Query',
            'fields' => [
                'iface' => ['type' => $AnotherInterface],
            ],
        ]);

        $this->expectException(InvariantViolation::class);
        $this->expectExceptionMessage(
            'Schema must contain unique named types but contains multiple types named "BadObject" ' .
            '(see http://webonyx.github.io/graphql-php/type-system/#type-registry).'
        );
        $schema = new Schema([
            'query' => $QueryType,
            'types' => [$FirstBadObject, $SecondBadObject],
        ]);
        $schema->assertValid();
    }

    public function objectWithIsTypeOf() : ObjectType
    {
        return new ObjectType([
            'name'   => 'ObjectWithIsTypeOf',
            'fields' => ['f' => ['type' => Type::string()]],
        ]);
    }
}