private function mockIsMimeSupportedWithBrokenSystem($mimeType)
 {
     $this->previewManager->expects($this->once())->method('isMimeSupported')->with($mimeType)->willThrowException(new \Exception('Boom'));
 }
 private function mockPreviewValidatorWithBrokenSystem()
 {
     $this->previewManager->expects($this->once())->method('previewValidator')->with($this->anything())->willThrowException(new \Exception('Boom'));
 }