new_contents: import pytest
  
  import large_image
  from large_image.cache_util import cachesClear
  
  from .datastore import datastore
  
  
  @pytest.mark.singular
  def testCacheSourceStyle():
      cachesClear()
      imagePath = datastore.fetch('sample_image.ptif')
      ts1 = large_image.open(imagePath)
      ts2 = large_image.open(imagePath, style={'max': 128})
      ts3 = large_image.open(imagePath, style={'max': 160})
      tile1 = ts1.getTile(0, 0, 4)
      assert ts1.getTile(0, 0, 4) is not None
      assert ts2.getTile(0, 0, 4) is not None
      assert ts3.getTile(0, 0, 4) is not None
      cachesClear()
      assert ts1.getTile(0, 0, 4) == tile1
      del ts1
      assert ts2.getTile(1, 0, 4) is not None
      cachesClear()
      assert ts2.getTile(2, 0, 4) is not None
      ts1 = large_image.open(imagePath)
      assert ts1.getTile(0, 0, 4) == tile1
  
  
  @pytest.mark.singular
  def testCacheSourceStyleFirst():
      cachesClear()
      imagePath = datastore.fetch('sample_image.ptif')
      ts2 = large_image.open(imagePath, style={'max': 128})
      ts1 = large_image.open(imagePath)
      tile1 = ts1.getTile(0, 0, 4)
      assert ts1.getTile(0, 0, 4) is not None
      assert ts2.getTile(0, 0, 4) is not None
      del ts1
      assert ts2.getTile(1, 0, 4) is not None
      cachesClear()
      assert ts2.getTile(2, 0, 4) is not None
      ts1 = large_image.open(imagePath)
      assert ts1.getTile(0, 0, 4) == tile1
  
subject: Add some source cache tests.