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 +11,14 @@
 
 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']);
+        // Using a regex here because in some cases the message gets prefixed with "Type error:"
+        $this->assertRegExp('/Simulating a TypeError/', $result['errors'][0]['debugMessage']);
     }
 
     protected function resolveApplicationExceptionHandler($app)
@@ -31,7 +30,8 @@ protected function resolveApplicationExceptionHandler($app)
             ->shouldReceive('report')
             ->with(Mockery::on(
                 function (FatalThrowableError $error) {
-                    $this->assertRegExp(static::ERROR_REGEX, $error->getMessage());
+                    // Using a regex here because in some cases the message gets prefixed with "Type error:"
+                    $this->assertRegExp('/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');
     }
 }