More definition tests (for type validation)

src/Type/Definition/FieldDefinition.php

@@ -1,5 +1,6 @@
 <?php
 namespace GraphQL\Type\Definition;
+use GraphQL\Error\Error;
 use GraphQL\Error\InvariantViolation;
 use GraphQL\Language\AST\FieldDefinitionNode;
 use GraphQL\Language\AST\TypeDefinitionNode;
@@ -82,8 +83,15 @@ class FieldDefinition
         $map = [];
         foreach ($fields as $name => $field) {
             if (is_array($field)) {
-                if (!isset($field['name']) && is_string($name)) {
+                if (!isset($field['name'])) {
+                    if (is_string($name)) {
                         $field['name'] = $name;
+                    } else {
+                        throw new InvariantViolation(
+                            "{$type->name} fields must be an associative array with field names as keys or a " .
+                            "function which returns such an array."
+                        );
+                    }
                 }
                 if (isset($field['args']) && !is_array($field['args'])) {
                     throw new InvariantViolation(
@@ -185,7 +193,7 @@ class FieldDefinition
     {
         try {
             Utils::assertValidName($this->name);
-        } catch (InvariantViolation $e) {
+        } catch (Error $e) {
             throw new InvariantViolation("{$parentType->name}.{$this->name}: {$e->getMessage()}");
         }
         Utils::invariant(

src/Type/Definition/InputObjectField.php

@@ -1,6 +1,9 @@
 <?php
 namespace GraphQL\Type\Definition;
+use GraphQL\Error\Error;
+use GraphQL\Error\InvariantViolation;
 use GraphQL\Language\AST\InputValueDefinitionNode;
+use GraphQL\Utils\Utils;
 
 /**
  * Class InputObjectField
@@ -81,4 +84,30 @@ class InputObjectField
     {
         return $this->defaultValueExists;
     }
+
+    /**
+     * @param Type $parentType
+     * @throws InvariantViolation
+     */
+    public function assertValid(Type $parentType)
+    {
+        try {
+            Utils::assertValidName($this->name);
+        } catch (Error $e) {
+            throw new InvariantViolation("{$parentType->name}.{$this->name}: {$e->getMessage()}");
+        }
+        $type = $this->type;
+        if ($type instanceof WrappingType) {
+            $type = $type->getWrappedType(true);
+        }
+        Utils::invariant(
+            $type instanceof InputType,
+            "{$parentType->name}.{$this->name} field type must be Input Type but got: " . Utils::printSafe($this->type)
+        );
+        Utils::invariant(
+            empty($this->config['resolve']),
+            "{$parentType->name}.{$this->name} field type has a resolve property, " .
+            'but Input Types cannot define resolvers.'
+        );
+    }
 }

src/Type/Definition/InputObjectType.php

@@ -80,4 +80,25 @@ class InputObjectType extends Type implements InputType, NamedType
         Utils::invariant(isset($this->fields[$name]), "Field '%s' is not defined for type '%s'", $name, $this->name);
         return $this->fields[$name];
     }
+
+    /**
+     * Validates type config and throws if one of type options is invalid.
+     * Note: this method is shallow, it won't validate object fields and their arguments.
+     *
+     * @throws InvariantViolation
+     */
+    public function assertValid()
+    {
+        parent::assertValid();
+
+        Utils::invariant(
+            !empty($this->getFields()),
+            "{$this->name} fields must be an associative array with field names as keys or a " .
+            "callable which returns such an array."
+        );
+
+        foreach ($this->getFields() as $field) {
+            $field->assertValid($this);
+        }
+    }
 }

src/Type/Definition/InterfaceType.php

@@ -110,9 +110,11 @@ class InterfaceType extends Type implements AbstractType, OutputType, CompositeT
     {
         parent::assertValid();
 
+        $resolveType = $this->config['resolveType'] ?? null;
+
         Utils::invariant(
-            !isset($this->config['resolveType']) || is_callable($this->config['resolveType']),
+            !isset($resolveType) || is_callable($resolveType),
-            "{$this->name} must provide \"resolveType\" as a function."
+            "{$this->name} must provide \"resolveType\" as a function, but got: " . Utils::printSafe($resolveType)
         );
     }
 }

src/Type/Definition/ObjectType.php

@@ -207,9 +207,15 @@ class ObjectType extends Type implements OutputType, CompositeType, NamedType
             "{$this->name} description must be string if set, but it is: " . Utils::printSafe($this->description)
         );
 
+        $isTypeOf = $this->config['isTypeOf'] ?? null;
+
         Utils::invariant(
-            !isset($this->config['isTypeOf']) || is_callable($this->config['isTypeOf']),
+            !isset($isTypeOf) || is_callable($isTypeOf),
-            "{$this->name} must provide 'isTypeOf' as a function"
+            "{$this->name} must provide \"isTypeOf\" as a function, but got: " . Utils::printSafe($isTypeOf)
         );
+
+        foreach ($this->getFields() as $field) {
+            $field->assertValid($this);
+        }
     }
 }

src/Type/Definition/Type.php

@@ -216,16 +216,7 @@ abstract class Type implements \JsonSerializable
      */
     public static function isType($type)
     {
-        return (
+        return $type instanceof Type;
-            $type instanceof ScalarType ||
-            $type instanceof ObjectType ||
-            $type instanceof InterfaceType ||
-            $type instanceof UnionType ||
-            $type instanceof EnumType ||
-            $type instanceof InputObjectType ||
-            $type instanceof ListOfType ||
-            $type instanceof NonNull
-        );
     }
 
     /**

src/Type/Definition/UnionType.php

@@ -121,7 +121,7 @@ class UnionType extends Type implements AbstractType, OutputType, CompositeType,
         if (isset($this->config['resolveType'])) {
             Utils::invariant(
                 is_callable($this->config['resolveType']),
-                "{$this->name} must provide \"resolveType\" as a function."
+                "{$this->name} must provide \"resolveType\" as a function, but got: " . Utils::printSafe($this->config['resolveType'])
             );
         }
     }

src/Type/Schema.php

@@ -406,7 +406,8 @@ class Schema
      * @api
      * @return InvariantViolation[]|Error[]
      */
-    public function validate() {
+    public function validate()
+    {
         // If this Schema has already been validated, return the previous results.
         if ($this->validationErrors !== null) {
             return $this->validationErrors;

src/Type/SchemaValidationContext.php

@@ -49,11 +49,13 @@ class SchemaValidationContext
     /**
      * @return Error[]
      */
-    public function getErrors() {
+    public function getErrors()
+    {
         return $this->errors;
     }
 
-    public function validateRootTypes() {
+    public function validateRootTypes()
+    {
         $queryType = $this->schema->getQueryType();
         if (!$queryType) {
             $this->reportError(
@@ -208,7 +210,8 @@ class SchemaValidationContext
     /**
      * @param ObjectType|InterfaceType $type
      */
-    private function validateFields($type) {
+    private function validateFields($type)
+    {
         $fieldMap = $type->getFields();
 
         // Objects and Interfaces both must define one or more fields.
@@ -271,7 +274,8 @@ class SchemaValidationContext
         }
     }
 
-    private function validateObjectInterfaces(ObjectType $object) {
+    private function validateObjectInterfaces(ObjectType $object)
+    {
         $implementedTypeNames = [];
         foreach($object->getInterfaces() as $iface) {
             if (isset($implementedTypeNames[$iface->name])) {
@@ -714,7 +718,8 @@ class SchemaValidationContext
      * @param string $message
      * @param array|Node|TypeNode|TypeDefinitionNode $nodes
      */
-    private function reportError($message, $nodes = null) {
+    private function reportError($message, $nodes = null)
+    {
         $nodes = array_filter($nodes && is_array($nodes) ? $nodes : [$nodes]);
         $this->addError(new Error($message, $nodes));
     }
@@ -722,7 +727,8 @@ class SchemaValidationContext
     /**
      * @param Error $error
      */
-    private function addError($error) {
+    private function addError($error)
+    {
         $this->errors[] = $error;
     }
 }