From e2875953e1fc0fcaf9f28cb2a5880689dea89362 Mon Sep 17 00:00:00 2001
From: vladar <vladimir.razuvaev@gmail.com>
Date: Thu, 19 Jan 2017 19:23:00 +0700
Subject: [PATCH] Tests for new GraphQL\Server facade

---
 src/Server.php       | 134 +++++++++--
 tests/ServerTest.php | 544 ++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 653 insertions(+), 25 deletions(-)

diff --git a/src/Server.php b/src/Server.php
index 3d99120..e10f15d 100644
--- a/src/Server.php
+++ b/src/Server.php
@@ -2,11 +2,11 @@
 namespace GraphQL;
 
 use GraphQL\Error\Error;
+use GraphQL\Error\InvariantViolation;
 use GraphQL\Executor\ExecutionResult;
 use GraphQL\Executor\Promise\PromiseAdapter;
 use GraphQL\Language\AST\DocumentNode;
 use GraphQL\Language\Parser;
-use GraphQL\Type\Definition\Config;
 use GraphQL\Type\Definition\Directive;
 use GraphQL\Type\Definition\ObjectType;
 use GraphQL\Type\Definition\Type;
@@ -17,7 +17,6 @@ class Server
 {
     const DEBUG_PHP_ERRORS = 1;
     const DEBUG_EXCEPTIONS = 2;
-    const DEBUG_SCHEMA_CONFIGS = 4;
     const DEBUG_ALL = 7;
 
     private $queryType;
@@ -88,6 +87,7 @@ class Server
      */
     public function setQueryType(ObjectType $queryType)
     {
+        $this->assertSchemaNotSet('Query Type', __METHOD__);
         $this->queryType = $queryType;
         return $this;
     }
@@ -106,6 +106,7 @@ class Server
      */
     public function setMutationType(ObjectType $mutationType)
     {
+        $this->assertSchemaNotSet('Mutation Type', __METHOD__);
         $this->mutationType = $mutationType;
         return $this;
     }
@@ -124,6 +125,7 @@ class Server
      */
     public function setSubscriptionType($subscriptionType)
     {
+        $this->assertSchemaNotSet('Subscription Type', __METHOD__);
         $this->subscriptionType = $subscriptionType;
         return $this;
     }
@@ -134,10 +136,16 @@ class Server
      */
     public function addTypes(array $types)
     {
-        $this->types = array_merge($this->types, $types);
+        if (!empty($types)) {
+            $this->assertSchemaNotSet('Types', __METHOD__);
+            $this->types = array_merge($this->types, $types);
+        }
         return $this;
     }
 
+    /**
+     * @return array
+     */
     public function getTypes()
     {
         return $this->types;
@@ -161,6 +169,7 @@ class Server
      */
     public function setDirectives(array $directives)
     {
+        $this->assertSchemaNotSet('Directives', __METHOD__);
         $this->directives = $directives;
         return $this;
     }
@@ -219,6 +228,58 @@ class Server
         return $this->rootValue;
     }
 
+    /**
+     * Set schema instance manually. Mutually exclusive with `setQueryType`, `setMutationType`, `setSubscriptionType`, `setDirectives`, `addTypes`
+     *
+     * @param Schema $schema
+     * @return $this
+     */
+    public function setSchema(Schema $schema)
+    {
+        if ($this->queryType) {
+            $err = 'Query Type is already set';
+            $errMethod = __CLASS__ . '::setQueryType';
+        } else if ($this->mutationType) {
+            $err = 'Mutation Type is already set';
+            $errMethod = __CLASS__ . '::setMutationType';
+        } else if ($this->subscriptionType) {
+            $err = 'Subscription Type is already set';
+            $errMethod = __CLASS__ . '::setSubscriptionType';
+        } else if ($this->directives) {
+            $err = 'Directives are already set';
+            $errMethod = __CLASS__ . '::setDirectives';
+        } else if ($this->types) {
+            $err = 'Additional types are already set';
+            $errMethod = __CLASS__ . '::addTypes';
+        } else if ($this->typeResolutionStrategy) {
+            $err = 'Type Resolution Strategy is already set';
+            $errMethod = __CLASS__ . '::setTypeResolutionStrategy';
+        } else if ($this->schema && $this->schema !== $schema) {
+            $err = 'Different schema is already set';
+        }
+
+        if (isset($err)) {
+            if (isset($errMethod)) {
+                $err .= " ($errMethod is mutually exclusive with " . __METHOD__ . ")";
+            }
+            throw new InvariantViolation("Cannot set Schema on Server: $err");
+        }
+        $this->schema = $schema;
+        return $this;
+    }
+
+    /**
+     * @param $entry
+     * @param $mutuallyExclusiveMethod
+     */
+    private function assertSchemaNotSet($entry, $mutuallyExclusiveMethod)
+    {
+        if ($this->schema) {
+            $schemaMethod = __CLASS__ . '::setSchema';
+            throw new InvariantViolation("Cannot set $entry on Server: Schema is already set ($mutuallyExclusiveMethod is mutually exclusive with $schemaMethod)");
+        }
+    }
+
     /**
      * @return Schema
      */
@@ -246,6 +307,8 @@ class Server
     }
 
     /**
+     * Expects function(\ErrorException $e) : array
+     *
      * @param callable $phpErrorFormatter
      */
     public function setPhpErrorFormatter(callable $phpErrorFormatter)
@@ -262,6 +325,8 @@ class Server
     }
 
     /**
+     * Expects function(Exception $e) : array
+     *
      * @param callable $exceptionFormatter
      */
     public function setExceptionFormatter(callable $exceptionFormatter)
@@ -302,8 +367,11 @@ class Server
     }
 
     /**
+     * Parses GraphQL query string and returns Abstract Syntax Tree for this query
+     *
      * @param string $query
      * @return Language\AST\DocumentNode
+     * @throws \GraphQL\Error\SyntaxError
      */
     public function parse($query)
     {
@@ -323,10 +391,12 @@ class Server
 
     /**
      * @param array $validationRules
+     * @return $this
      */
     public function setValidationRules(array $validationRules)
     {
         $this->validationRules = $validationRules;
+        return $this;
     }
 
     /**
@@ -343,12 +413,13 @@ class Server
      */
     public function setTypeResolutionStrategy(Resolution $typeResolutionStrategy)
     {
+        $this->assertSchemaNotSet('Type Resolution Strategy', __METHOD__);
         $this->typeResolutionStrategy = $typeResolutionStrategy;
         return $this;
     }
 
     /**
-     * @return PromiseAdapter
+     * @return PromiseAdapter|null
      */
     public function getPromiseAdapter()
     {
@@ -363,22 +434,33 @@ class Server
      */
     public function setPromiseAdapter(PromiseAdapter $promiseAdapter)
     {
+        if ($this->promiseAdapter && $promiseAdapter !== $this->promiseAdapter) {
+            throw new InvariantViolation("Cannot set promise adapter: Different adapter is already set");
+        }
         $this->promiseAdapter = $promiseAdapter;
         return $this;
     }
 
     /**
-     * Returns array with validation errors
+     * Returns array with validation errors (empty when there are no validation errors)
      *
      * @param DocumentNode $query
      * @return array
      */
     public function validate(DocumentNode $query)
     {
-        return DocumentValidator::validate($this->getSchema(), $query, $this->validationRules);
+        try {
+            $schema = $this->getSchema();
+        } catch (InvariantViolation $e) {
+            throw new InvariantViolation("Cannot validate, schema contains errors: {$e->getMessage()}", null, $e);
+        }
+
+        return DocumentValidator::validate($schema, $query, $this->validationRules);
     }
 
     /**
+     * Executes GraphQL query against this server and returns execution result
+     *
      * @param string|DocumentNode $query
      * @param array|null $variables
      * @param string|null $operationName
@@ -389,17 +471,10 @@ class Server
         $this->phpErrors = [];
         if ($this->debug & static::DEBUG_PHP_ERRORS) {
             // Catch custom errors (to report them in query results)
-            $lastDisplayErrors = ini_get('display_errors');
-            ini_set('display_errors', 0);
-
             set_error_handler(function($severity, $message, $file, $line) {
                 $this->phpErrors[] = new \ErrorException($message, 0, $severity, $file, $line);
             });
         }
-        if ($this->debug & static::DEBUG_SCHEMA_CONFIGS) {
-            $isConfigValidationEnabled = Config::isValidationEnabled();
-            Config::enableValidation();
-        }
 
         $result = GraphQL::executeAndReturnResult(
             $this->getSchema(),
@@ -420,38 +495,40 @@ class Server
             $result->extensions['phpErrors'] = array_map($this->phpErrorFormatter, $this->phpErrors);
         }
 
-        if (isset($lastDisplayErrors)) {
-            ini_set('display_errors', $lastDisplayErrors);
+        if ($this->debug & static::DEBUG_PHP_ERRORS) {
             restore_error_handler();
         }
-        if (isset($isConfigValidationEnabled) && !$isConfigValidationEnabled) {
-            Config::disableValidation();
-        }
         return $result;
     }
 
+    /**
+     * GraphQL HTTP endpoint compatible with express-graphql
+     */
     public function handleRequest()
     {
         try {
             $httpStatus = 200;
             if (isset($_SERVER['CONTENT_TYPE']) && strpos($_SERVER['CONTENT_TYPE'], 'application/json') !== false) {
-                $raw = file_get_contents('php://input') ?: '';
+                $raw = $this->readInput();
                 $data = json_decode($raw, true);
             } else {
                 $data = $_REQUEST;
             }
             $data += ['query' => null, 'variables' => null];
             $result = $this->executeQuery($data['query'], (array) $data['variables'])->toArray();
-        } catch (\Exception $exception) {
+        } catch (\Exception $e) {
             // This is only possible for schema creation errors and some very unpredictable errors,
             // (all errors which occur during query execution are caught and included in final response)
             $httpStatus = $this->unexpectedErrorStatus;
-            $error = new Error($this->unexpectedErrorMessage, null, null, null, null, $exception);
+            $error = new Error($this->unexpectedErrorMessage, null, null, null, null, $e);
+            $result = ['errors' => [$this->formatError($error)]];
+        } catch (\Error $e) {
+            $httpStatus = $this->unexpectedErrorStatus;
+            $error = new Error($this->unexpectedErrorMessage, null, null, null, null, $e);
             $result = ['errors' => [$this->formatError($error)]];
         }
 
-        header('Content-Type: application/json', true, $httpStatus);
-        echo json_encode($result);
+        $this->produceOutput($result, $httpStatus);
     }
 
     private function formatException(\Exception $e)
@@ -473,4 +550,15 @@ class Server
         }
         return $result;
     }
+
+    protected function readInput()
+    {
+        return  file_get_contents('php://input') ?: '';
+    }
+
+    protected function produceOutput(array $result, $httpStatus)
+    {
+        header('Content-Type: application/json', true, $httpStatus);
+        echo json_encode($result);
+    }
 }
diff --git a/tests/ServerTest.php b/tests/ServerTest.php
index d1e7ebb..f249eb0 100644
--- a/tests/ServerTest.php
+++ b/tests/ServerTest.php
@@ -1,9 +1,17 @@
 <?php
 namespace GraphQL\Tests;
 
+use GraphQL\Error\Error;
 use GraphQL\Error\InvariantViolation;
+use GraphQL\Executor\ExecutionResult;
+use GraphQL\Executor\Promise\Adapter\SyncPromiseAdapter;
+use GraphQL\Schema;
 use GraphQL\Server;
 use GraphQL\Type\Definition\Directive;
+use GraphQL\Type\Definition\ObjectType;
+use GraphQL\Type\Definition\ResolveInfo;
+use GraphQL\Type\Definition\Type;
+use GraphQL\Type\EagerResolution;
 use GraphQL\Validator\DocumentValidator;
 
 class ServerTest extends \PHPUnit_Framework_TestCase
@@ -14,14 +22,17 @@ class ServerTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals(null, $server->getQueryType());
         $this->assertEquals(null, $server->getMutationType());
         $this->assertEquals(null, $server->getSubscriptionType());
+        $this->assertEquals(Directive::getInternalDirectives(), $server->getDirectives());
+        $this->assertEquals([], $server->getTypes());
+        $this->assertEquals(null, $server->getTypeResolutionStrategy());
+
         $this->assertEquals(null, $server->getContext());
         $this->assertEquals(null, $server->getRootValue());
         $this->assertEquals(0, $server->getDebug());
-        $this->assertEquals(Directive::getInternalDirectives(), $server->getDirectives());
+
         $this->assertEquals(['GraphQL\Error\FormattedError', 'createFromException'], $server->getExceptionFormatter());
         $this->assertEquals(['GraphQL\Error\FormattedError', 'createFromPHPError'], $server->getPhpErrorFormatter());
         $this->assertEquals(null, $server->getPromiseAdapter());
-        $this->assertEquals(null, $server->getTypeResolutionStrategy());
         $this->assertEquals('Unexpected Error', $server->getUnexpectedErrorMessage());
         $this->assertEquals(500, $server->getUnexpectedErrorStatus());
         $this->assertEquals(DocumentValidator::allRules(), $server->getValidationRules());
@@ -33,4 +44,533 @@ class ServerTest extends \PHPUnit_Framework_TestCase
             $this->assertEquals('Schema query must be Object Type but got: NULL', $e->getMessage());
         }
     }
+
+    public function testSchemaDefinition()
+    {
+        $mutationType = $queryType = $subscriptionType = new ObjectType(['name' => 'A', 'fields' => []]);
+
+        $schema = new Schema([
+            'query' => $queryType
+        ]);
+
+        try {
+            Server::create()
+                ->setQueryType($queryType)
+                ->setSchema($schema);
+            $this->fail('Expected exception not thrown');
+        } catch (InvariantViolation $e) {
+            $this->assertEquals(
+                'Cannot set Schema on Server: Query Type is already set '.
+                '(GraphQL\Server::setQueryType is mutually exclusive with GraphQL\Server::setSchema)',
+                $e->getMessage()
+            );
+        }
+
+        try {
+            Server::create()
+                ->setMutationType($mutationType)
+                ->setSchema($schema);
+            $this->fail('Expected exception not thrown');
+        } catch (InvariantViolation $e) {
+            $this->assertEquals(
+                'Cannot set Schema on Server: Mutation Type is already set '.
+                '(GraphQL\Server::setMutationType is mutually exclusive with GraphQL\Server::setSchema)',
+                $e->getMessage()
+            );
+        }
+
+        try {
+            Server::create()
+                ->setSubscriptionType($subscriptionType)
+                ->setSchema($schema);
+            $this->fail('Expected exception not thrown');
+        } catch (InvariantViolation $e) {
+            $this->assertEquals(
+                'Cannot set Schema on Server: Subscription Type is already set '.
+                '(GraphQL\Server::setSubscriptionType is mutually exclusive with GraphQL\Server::setSchema)',
+                $e->getMessage()
+            );
+        }
+
+        try {
+            Server::create()
+                ->setDirectives(Directive::getInternalDirectives())
+                ->setSchema($schema);
+            $this->fail('Expected exception not thrown');
+        } catch (InvariantViolation $e) {
+            $this->assertEquals(
+                'Cannot set Schema on Server: Directives are already set '.
+                '(GraphQL\Server::setDirectives is mutually exclusive with GraphQL\Server::setSchema)',
+                $e->getMessage()
+            );
+        }
+
+        try {
+            Server::create()
+                ->addTypes([$queryType, $mutationType])
+                ->setSchema($schema);
+            $this->fail('Expected exception not thrown');
+        } catch (InvariantViolation $e) {
+            $this->assertEquals(
+                'Cannot set Schema on Server: Additional types are already set '.
+                '(GraphQL\Server::addTypes is mutually exclusive with GraphQL\Server::setSchema)',
+                $e->getMessage()
+            );
+        }
+
+
+        try {
+            Server::create()
+                ->setTypeResolutionStrategy(new EagerResolution([$queryType, $mutationType]))
+                ->setSchema($schema);
+            $this->fail('Expected exception not thrown');
+        } catch (InvariantViolation $e) {
+            $this->assertEquals(
+                'Cannot set Schema on Server: Type Resolution Strategy is already set '.
+                '(GraphQL\Server::setTypeResolutionStrategy is mutually exclusive with GraphQL\Server::setSchema)',
+                $e->getMessage()
+            );
+        }
+
+        try {
+            Server::create()
+                ->setSchema($schema)
+                ->setQueryType($queryType);
+            $this->fail('Expected exception not thrown');
+        } catch (InvariantViolation $e) {
+            $this->assertEquals(
+                'Cannot set Query Type on Server: Schema is already set '.
+                '(GraphQL\Server::setQueryType is mutually exclusive with GraphQL\Server::setSchema)',
+                $e->getMessage()
+            );
+        }
+
+        try {
+            Server::create()
+                ->setSchema($schema)
+                ->setMutationType($mutationType);
+            $this->fail('Expected exception not thrown');
+        } catch (InvariantViolation $e) {
+            $this->assertEquals(
+                'Cannot set Mutation Type on Server: Schema is already set '.
+                '(GraphQL\Server::setMutationType is mutually exclusive with GraphQL\Server::setSchema)',
+                $e->getMessage()
+            );
+        }
+
+        try {
+            Server::create()
+                ->setSchema($schema)
+                ->setSubscriptionType($subscriptionType);
+            $this->fail('Expected exception not thrown');
+        } catch (InvariantViolation $e) {
+            $this->assertEquals(
+                'Cannot set Subscription Type on Server: Schema is already set '.
+                '(GraphQL\Server::setSubscriptionType is mutually exclusive with GraphQL\Server::setSchema)',
+                $e->getMessage()
+            );
+        }
+
+        try {
+            Server::create()
+                ->setSchema($schema)
+                ->setDirectives([]);
+            $this->fail('Expected exception not thrown');
+        } catch (InvariantViolation $e) {
+            $this->assertEquals(
+                'Cannot set Directives on Server: Schema is already set '.
+                '(GraphQL\Server::setDirectives is mutually exclusive with GraphQL\Server::setSchema)',
+                $e->getMessage()
+            );
+        }
+
+        try {
+            Server::create()
+                ->setSchema($schema)
+                ->addTypes([$queryType, $mutationType]);
+            $this->fail('Expected exception not thrown');
+        } catch (InvariantViolation $e) {
+            $this->assertEquals(
+                'Cannot set Types on Server: Schema is already set '.
+                '(GraphQL\Server::addTypes is mutually exclusive with GraphQL\Server::setSchema)',
+                $e->getMessage()
+            );
+        }
+        // But empty types should work (as they don't change anything):
+        Server::create()
+            ->setSchema($schema)
+            ->addTypes([]);
+
+        try {
+            Server::create()
+                ->setSchema($schema)
+                ->setTypeResolutionStrategy(new EagerResolution([$queryType, $mutationType]));
+            $this->fail('Expected exception not thrown');
+        } catch (InvariantViolation $e) {
+            $this->assertEquals(
+                'Cannot set Type Resolution Strategy on Server: Schema is already set '.
+                '(GraphQL\Server::setTypeResolutionStrategy is mutually exclusive with GraphQL\Server::setSchema)',
+                $e->getMessage()
+            );
+        }
+
+        try {
+            Server::create()
+                ->setSchema($schema)
+                ->setSchema(new Schema(['query' => $queryType]));
+            $this->fail('Expected exception not thrown');
+        } catch (InvariantViolation $e) {
+            $this->assertEquals(
+                'Cannot set Schema on Server: Different schema is already set',
+                $e->getMessage()
+            );
+        }
+
+
+        // This should not throw:
+        $server = Server::create()
+            ->setSchema($schema);
+
+        $this->assertSame($schema, $server->getSchema());
+
+        $server = Server::create()
+            ->setQueryType($queryType);
+        $this->assertSame($queryType, $server->getQueryType());
+        $this->assertSame($queryType, $server->getSchema()->getQueryType());
+
+        $server = Server::create()
+            ->setQueryType($queryType)
+            ->setMutationType($mutationType);
+
+        $this->assertSame($mutationType, $server->getMutationType());
+        $this->assertSame($mutationType, $server->getSchema()->getMutationType());
+
+        $server = Server::create()
+            ->setQueryType($queryType)
+            ->setSubscriptionType($subscriptionType);
+
+        $this->assertSame($subscriptionType, $server->getSubscriptionType());
+        $this->assertSame($subscriptionType, $server->getSchema()->getSubscriptionType());
+
+        $server = Server::create()
+            ->setQueryType($queryType)
+            ->addTypes($types = [$queryType, $subscriptionType]);
+
+        $this->assertSame($types, $server->getTypes());
+        $server->addTypes([$mutationType]);
+        $this->assertSame(array_merge($types, [$mutationType]), $server->getTypes());
+
+        $server = Server::create()
+            ->setDirectives($directives = []);
+
+        $this->assertSame($directives, $server->getDirectives());
+    }
+
+    public function testParse()
+    {
+        $server = Server::create();
+        $ast = $server->parse('{q}');
+        $this->assertInstanceOf('GraphQL\Language\AST\DocumentNode', $ast);
+
+        try {
+            $server->parse('{q');
+            $this->fail('Expected exception not thrown');
+        } catch (\GraphQL\Error\SyntaxError $e) {
+            $this->assertContains('{q', $e->getMessage());
+        }
+    }
+
+    public function testValidate()
+    {
+        $server = Server::create()
+            ->setQueryType(new ObjectType(['name' => 'Q', 'fields' => []]));
+
+        $ast = $server->parse('{q}');
+        $errors = $server->validate($ast);
+
+        $this->assertInternalType('array', $errors);
+        $this->assertNotEmpty($errors);
+
+        try {
+            $server = Server::create();
+            $server->validate($ast);
+            $this->fail('Expected exception not thrown');
+        } catch (InvariantViolation $e) {
+            $this->assertEquals(
+                'Cannot validate, schema contains errors: Schema query must be Object Type but got: NULL',
+                $e->getMessage()
+            );
+        }
+    }
+
+    public function testPromiseAdapter()
+    {
+        $adapter1 = new SyncPromiseAdapter();
+        $adapter2 = new SyncPromiseAdapter();
+
+        $server = Server::create()
+            ->setPromiseAdapter($adapter1);
+
+        $this->assertSame($adapter1, $server->getPromiseAdapter());
+        $server->setPromiseAdapter($adapter1);
+
+        try {
+            $server->setPromiseAdapter($adapter2);
+            $this->fail('Expected exception not thrown');
+        } catch (InvariantViolation $e) {
+            $this->assertEquals(
+                'Cannot set promise adapter: Different adapter is already set',
+                $e->getMessage()
+            );
+        }
+    }
+
+    public function testValidationRules()
+    {
+        $rules = [];
+        $server = Server::create()
+            ->setValidationRules($rules);
+
+        $this->assertSame($rules, $server->getValidationRules());
+    }
+
+    public function testExecuteQuery()
+    {
+        $called = false;
+        $queryType = new ObjectType([
+            'name' => 'Q',
+            'fields' => [
+                'field' => [
+                    'type' => Type::string(),
+                    'resolve' => function($value, $args, $context, ResolveInfo $info) use (&$called) {
+                        $called = true;
+                        $this->assertEquals(null, $context);
+                        $this->assertEquals(null, $value);
+                        $this->assertEquals(null, $info->rootValue);
+                        return 'ok';
+                    }
+                ]
+            ]
+        ]);
+
+        $server = Server::create()
+            ->setQueryType($queryType);
+
+        $result = $server->executeQuery('{field}');
+        $this->assertEquals(true, $called);
+        $this->assertInstanceOf('GraphQL\Executor\ExecutionResult', $result);
+        $this->assertEquals(['data' => ['field' => 'ok']], $result->toArray());
+
+        $called = false;
+        $contextValue = new \stdClass();
+        $rootValue = new \stdClass();
+
+        $queryType = new ObjectType([
+            'name' => 'QueryType',
+            'fields' => [
+                'field' => [
+                    'type' => Type::string(),
+                    'resolve' => function($value, $args, $context, ResolveInfo $info) use (&$called, $contextValue, $rootValue) {
+                        $called = true;
+                        $this->assertSame($rootValue, $value);
+                        $this->assertSame($contextValue, $context);
+                        $this->assertEquals($rootValue, $info->rootValue);
+                        return 'ok';
+                    }
+                ]
+            ]
+        ]);
+
+        $server = Server::create()
+            ->setQueryType($queryType)
+            ->setRootValue($rootValue)
+            ->setContext($contextValue);
+
+        $result = $server->executeQuery('{field}');
+        $this->assertEquals(true, $called);
+        $this->assertInstanceOf('GraphQL\Executor\ExecutionResult', $result);
+        $this->assertEquals(['data' => ['field' => 'ok']], $result->toArray());
+    }
+
+    public function testDebugPhpErrors()
+    {
+        $queryType = new ObjectType([
+            'name' => 'Query',
+            'fields' => [
+                'err' => [
+                    'type' => Type::string(),
+                    'resolve' => function() {
+                        trigger_error('notice', E_USER_NOTICE);
+                        return 'err';
+                    }
+                ]
+            ]
+        ]);
+
+        $server = Server::create()
+            ->setDebug(0)
+            ->setQueryType($queryType);
+
+        $prevEnabled = \PHPUnit_Framework_Error_Notice::$enabled;
+        \PHPUnit_Framework_Error_Notice::$enabled = false;
+        $result = @$server->executeQuery('{err}');
+
+        $expected = [
+            'data' => ['err' => 'err']
+        ];
+        $this->assertEquals($expected, $result->toArray());
+
+        $server->setDebug(Server::DEBUG_PHP_ERRORS);
+        $result = @$server->executeQuery('{err}');
+
+        $expected = [
+            'data' => ['err' => 'err'],
+            'extensions' => [
+                'phpErrors' => [
+                    [
+                        'message' => 'notice',
+                        'severity' => 1024,
+                        // 'trace' => [...]
+                    ]
+                ]
+            ]
+        ];
+
+        $this->assertArraySubset($expected, $result->toArray());
+
+        $server->setPhpErrorFormatter(function(\ErrorException $e) {
+            return ['test' => $e->getMessage()];
+        });
+
+        $result = $server->executeQuery('{err}');
+        $expected = [
+            'data' => ['err' => 'err'],
+            'extensions' => [
+                'phpErrors' => [
+                    [
+                        'test' => 'notice'
+                    ]
+                ]
+            ]
+        ];
+        $this->assertEquals($expected, $result->toArray());
+
+        \PHPUnit_Framework_Error_Notice::$enabled = $prevEnabled;
+    }
+
+    public function testDebugExceptions()
+    {
+        $queryType = new ObjectType([
+            'name' => 'Query',
+            'fields' => [
+                'withException' => [
+                    'type' => Type::string(),
+                    'resolve' => function() {
+                        throw new \Exception("Error");
+                    }
+                ]
+            ]
+        ]);
+
+        $server = Server::create()
+            ->setDebug(0)
+            ->setQueryType($queryType);
+
+        $result = $server->executeQuery('{withException}');
+        $expected = [
+            'data' => [
+                'withException' => null
+            ],
+            'errors' => [[
+                'message' => 'Error',
+                'path' => ['withException'],
+                'locations' => [[
+                    'line' => 1,
+                    'column' => 2
+                ]]
+            ]]
+        ];
+        $this->assertEquals($expected, $result->toArray());
+
+        $server->setDebug(Server::DEBUG_EXCEPTIONS);
+        $result = $server->executeQuery('{withException}');
+
+        $expected['errors'][0]['exception'] = ['message' => 'Error', 'trace' => []];
+        $this->assertArraySubset($expected, $result->toArray());
+
+        $server->setExceptionFormatter(function(\Exception $e) {
+            return ['test' => $e->getMessage()];
+        });
+
+        $result = $server->executeQuery('{withException}');
+        $expected['errors'][0]['exception'] = ['test' => 'Error'];
+        $this->assertEquals($expected, $result->toArray());
+    }
+
+    public function testHandleRequest()
+    {
+        $mock = $this->getMock('GraphQL\Server', ['readInput', 'produceOutput']);
+        $mock->method('readInput')
+            ->will($this->returnValue(json_encode(['query' => '{err}'])));
+
+        $output = null;
+        $mock->method('produceOutput')
+            ->will($this->returnCallback(function($a1, $a2) use (&$output) {
+                $output = func_get_args();
+            }));
+
+        /** @var $mock Server */
+        $mock->handleRequest();
+
+        $this->assertInternalType('array', $output);
+        $this->assertEquals(['errors' => [['message' => 'Unexpected Error']]], $output[0]);
+        $this->assertEquals(500, $output[1]);
+
+        $output = null;
+        $mock->setUnexpectedErrorMessage($newErr = 'Hey! Something went wrong!');
+        $mock->setUnexpectedErrorStatus(501);
+        $mock->handleRequest();
+
+        $this->assertInternalType('array', $output);
+        $this->assertEquals(['errors' => [['message' => $newErr]]], $output[0]);
+        $this->assertEquals(501, $output[1]);
+
+        $mock->setQueryType(new ObjectType([
+            'name' => 'Query',
+            'fields' => [
+                'test' => [
+                    'type' => Type::string(),
+                    'resolve' => function() {
+                        return 'ok';
+                    }
+                ]
+            ]
+        ]));
+
+        $_REQUEST = ['query' => '{err}'];
+        $output = null;
+        $mock->handleRequest();
+        $this->assertInternalType('array', $output);
+
+        $expectedOutput = [
+            ['errors' => [[
+                'message' => 'Cannot query field "err" on type "Query".',
+                'locations' => [[
+                    'line' => 1,
+                    'column' => 2
+                ]]
+            ]]],
+            200
+        ];
+
+        $this->assertEquals($expectedOutput, $output);
+
+        $output = null;
+        $_SERVER['CONTENT_TYPE'] = 'application/json';
+        $_REQUEST = [];
+        $mock->handleRequest();
+
+        $this->assertInternalType('array', $output);
+        $this->assertEquals($expectedOutput, $output);
+    }
 }