Add test to cover BadRequestException for responses without a body

Author: oesteve

src/platform/tests/Bridge/OpenAi/Gpt/ResultConverterTest.php

@@ -214,4 +214,16 @@ public function testThrowsBadRequestExceptionOnBadRequestResponse()
 
         $converter->convert(new RawHttpResult($httpResponse));
     }
+
+    public function testThrowsBadRequestExceptionOnBadRequestResponseWithNoResponseBody()
+    {
+        $converter = new ResultConverter();
+        $httpResponse = self::createMock(ResponseInterface::class);
+        $httpResponse->method('getStatusCode')->willReturn(400);
+
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage('Bad Request');
+
+        $converter->convert(new RawHttpResult($httpResponse));
+    }
 }