Use different approach to simulate a TypeError

Using a "real PHP error" would always trigger PHPStan to actually report it
and this abort the travis testing pipeline.

Author: mfn

tests/Unit/EngineErrorInResolverTests/EngineErrorInResolverTest.php

@@ -11,15 +11,33 @@
 
 class EngineErrorInResolverTest extends TestCase
 {
-    private const ERROR_REGEX = '/QueryWithEngineErrorInCodeQuery::getResult\(\) must be of the type int\w*, string given, called in/';
-
     public function testForEngineError(): void
     {
         $result = $this->graphql('query { queryWithEngineErrorInCode }', [
             'expectErrors' => true,
         ]);
 
-        $this->assertRegExp(static::ERROR_REGEX, $result['errors'][0]['debugMessage']);
+        $expectedResult = [
+            'errors' => [
+                [
+                    'debugMessage' => 'Simulating a TypeError',
+                    'message' => 'Internal server error',
+                    'extensions' => [
+                        'category' => 'internal',
+                    ],
+                    'locations' => [
+                        [
+                            'line' => 1,
+                            'column' => 9,
+                        ],
+                    ],
+                    'path' => [
+                        'queryWithEngineErrorInCode',
+                    ],
+                ],
+            ],
+        ];
+        $this->assertSame($expectedResult, $result);;
     }
 
     protected function resolveApplicationExceptionHandler($app)
@@ -31,7 +49,7 @@ protected function resolveApplicationExceptionHandler($app)
             ->shouldReceive('report')
             ->with(Mockery::on(
                 function (FatalThrowableError $error) {
-                    $this->assertRegExp(static::ERROR_REGEX, $error->getMessage());
+                    $this->assertSame('Simulating a TypeError', $error->getMessage());
 
                     return true;
                 }

tests/Unit/EngineErrorInResolverTests/QueryWithEngineErrorInCodeQuery.php

@@ -4,6 +4,7 @@
 
 namespace Rebing\GraphQL\Tests\Unit\EngineErrorInResolverTests;
 
+use TypeError;
 use GraphQL\Type\Definition\Type;
 use Rebing\GraphQL\Support\Mutation;
 
@@ -20,11 +21,6 @@ public function type(): Type
 
     public function resolve($root, $args): string
     {
-        // This code deliberately creates a PHP error!
-        return $this->getResult('result');
-    }
-
-    private function getResult(int $string): string
-    {
+        throw new TypeError('Simulating a TypeError');
     }
 }