JsonTest. Deal with json returned as a stream not string.

It seems Oracle 11 returns json as a stream so convert streams to
strings.

tests/Functional/Types/JsonTest.php

@@ -9,7 +9,9 @@
 use Doctrine\DBAL\Tests\FunctionalTestCase;
 use Doctrine\DBAL\Types\Type;
 
+use function is_resource;
 use function json_decode;
+use function stream_get_contents;
 
 class JsonTest extends FunctionalTestCase
 {
@@ -69,6 +71,10 @@ private function select(int $id): array
             [ParameterType::INTEGER],
         );
 
+        if (is_resource($value)) {
+            $value = stream_get_contents($value);
+        }
+
         self::assertIsString($value);
 
         $value = json_decode($value, true);