code: def test_sanity(self):
      im = Image.new("L", (100, 100))
      assert (
          repr(im)[:45]
          == "<PIL.Image.Image image mode=L size=100x100 at"
      )
      assert im.mode == "L"
      assert im.size == (100, 100)
  
      im = Image.new("RGB", (100, 100))
      assert (
          repr(im)[:45]
          == "<PIL.Image.Image image mode=RGB size=100x100 "
      )
      assert im.mode == "RGB"
      assert im.size == (100, 100)
  
      Image.new("L", (100, 100), None)
      im2 = Image.new("L", (100, 100), 0)
      im3 = Image.new("L", (100, 100), "black")
  
      assert im2.getcolors() == [(10000, 0)]
      assert im3.getcolors() == [(10000, 0)]
  
      with pytest.raises(ValueError):
          Image.new("X", (100, 100))
      with pytest.raises(ValueError):
          Image.new("", (100, 100))
  
imports: import io
  import os
  import shutil
  import sys
  import tempfile
  import pytest
  from PIL import Image, ImageDraw, ImagePalette, UnidentifiedImageError
  from .helper import assert_image_equal, assert_image_equal_tofile, assert_image_similar_tofile, assert_not_all_same, hopper, is_win32, mark_if_feature_version, skip_unless_feature
label_desc: Use image node_id 4 for calling the TestImage obj's underlying member method code with example usage: obj.test_sanity() without return types