code: def test_stopwords_lowercasing():
      # test that capitalized stopwords work.
      wc = WordCloud(stopwords=["Beautiful"])
      processed = wc.process_text(THIS)
      words = [count[0] for count in processed]
      assert "Beautiful" not in words
  
imports: from wordcloud import WordCloud, get_single_color_func, ImageColorGenerator
  import numpy
  import pytest
  from random import Random
  from numpy.testing import assert_array_equal
  from PIL import Image
  import xml.etree.ElementTree
  import matplotlib
label_desc: Use image node_id 8 for calling a global function with example usage: test_stopwords_lowercasing() without return types