code: def test_str_for_title(image_array_2bands):
      """Test that a single string title renders properly."""
  
      single_band = image_array_2bands[0]
      ax = ep.plot_bands(arr=single_band, title="my title")
      plot_title = ax.get_title()
      assert "my title" in plot_title
      plt.close()
  
imports: import pytest
  import matplotlib.pyplot
  import matplotlib.colors
  import earthpy.plot
  import numpy
label_desc: Use image node_id 4 for calling a global function with example usage: test_str_for_title(image_array_2bands) without return types