code: def test_init(self):
      component = DocumentLanguageClassifier()
      assert component.languages == ["en"]
  
file_path: haystack/test/components/classifiers/test_document_language_classifier.py
imports: import logging
  import pytest
  from haystack import Document
  from haystack.components.classifiers import DocumentLanguageClassifier
label_desc: Use image node_id 1 for calling the TestDocumentLanguageClassifier obj's underlying member method code with example usage: obj.test_init() without return types