code: def test_clearcache(self):
      cached = []
      for entry in MODULES:
          filename = os.path.join(MODULE_PATH, entry) + ".py"
          cached.append(filename)
          linecache.getline(filename, 1)
  
      # Are all files cached?
      self.assertNotEqual(cached, [])
      cached_empty = [fn for fn in cached if fn not in linecache.cache]
      self.assertEqual(cached_empty, [])
  
      # Can we clear the cache?
      linecache.clearcache()
      cached_empty = [fn for fn in cached if fn in linecache.cache]
      self.assertEqual(cached_empty, [])
  
imports: import linecache
  import unittest
  import os.path
  import tempfile
  import tokenize
  from test import support
  from test.support import os_helper
label_desc: Use image node_id 3 for calling the LineCacheTests obj's underlying member method code with example usage: obj.test_clearcache() without return types