human
Solve the following python programming problem given the following code:
@ mock.patch.object (libvirt_utils, 'update_mtime') 
@ mock.patch.object (lockutils, 'external_lock') 
def test_verify_base_images(self, mock_lock, mock_mtime) : 
    hashed_1 = '356a192b7913b04c54574d18c28d46e6395428ab' 
    hashed_21 = '472b07b9fcf2c2451e8781e944bf5f77cd8457c8' 
    hashed_22 = '12c6fc06c99a462375eeb3f43dfd832b08ca9e17' 
    hashed_42 = '92cfceb39d57d914ed8b14d0e37643de0797ae56' 
    self.flags (instances_path = '/instance_path', image_cache_subdirectory_name = '_base') 
    base_file_list = ['00000001', 'ephemeral_0_20_None', 'e97222e91fc4241f49a7f520d1dcf446751129b3_sm', 'e09c675c2d1cfac32dae3c2d83689c8c94bc693b_sm', hashed_42, hashed_1, hashed_21, hashed_22, ('%s_5368709120' % hashed_1), ('%s_10737418240' % hashed_1), '00000004'] 
    def fq_path(path) : 
        return os.path.join ('/instance_path/_base/', path) 
orig_exists = os.path.exists 
    def exists(path) : 
        if (not path.startswith ('/instance_path')) : 
            return orig_exists (path) 
if (path in ['/instance_path', '/instance_path/_base', '/instance_path/instance-1/disk', '/instance_path/instance-2/disk', '/instance_path/instance-3/disk', ('/instance_path/_base/%s.info' % hashed_42)]) : 
            return True 
for p in base_file_list : 
            if (path == fq_path (p)) : 
                return True 
if (path == (fq_path (p) + '.info')) : 
                return False 
if (path in [('/instance_path/_base/%s_sm' % i) for i in [hashed_1, hashed_21, hashed_22, hashed_42]]) : 
            return False 
self.fail (('Unexpected path existence check: %s' % path)) 
self.stub_out ('os.path.exists', (lambda x : exists (x))) 
    orig_listdir = os.listdir 
    def listdir(path) : 
        if (not path.startswith ('/instance_path')) : 
            return orig_listdir (path) 
if (path == '/instance_path') : 
            return ['instance-1', 'instance-2', 'instance-3', '_base'] 
if (path == '/instance_path/_base') : 
            return base_file_list 
self.fail (('Unexpected directory listed: %s' % path))...

    
    

    Fix the buggy line: self.assertIn (instance, image_cache_manager.active_base_files)
assistant
#Here is Python code to fix the buggy line: self.

self.assertIn (act, image_cache_manager.active_base_files)