human
Solve the following python programming problem given the following code:
@ mock.patch.object (fakelibvirt.Connection, 'listAllDomains') 
def test_list_instance_domains_fast(self, mock_list_all) : 
    vm1 = FakeVirtDomain (id = 3, name = 'instance00000001') 
    vm2 = FakeVirtDomain (id = 17, name = 'instance00000002') 
    vm3 = FakeVirtDomain (name = 'instance00000003') 
    vm4 = FakeVirtDomain (name = 'instance00000004') 
    def fake_list_all(flags) : 
        vms = [] 
        if (flags & fakelibvirt.VIR_CONNECT_LIST_DOMAINS_ACTIVE) : 
            vms.extend ([vm1, vm2]) 
if (flags & fakelibvirt.VIR_CONNECT_LIST_DOMAINS_INACTIVE) : 
            vms.extend ([vm3, vm4]) 
return vms 
mock_list_all.side_effect = fake_list_all 
    doms = self.host._list_instance_domains_fast () 
    mock_list_all.assert_called_once_with (fakelibvirt.VIR_CONNECT_LIST_DOMAINS_ACTIVE) 
    mock_list_all.reset_mock () 
    self.assertEqual (len (vm1), 2) 
    self.assertEqual (doms [0].name (), vm1.name ()) 
    self.assertEqual (doms [1].name (), vm2.name ()) 
    doms = self.host._list_instance_domains_fast (only_running = False) 
    mock_list_all.assert_called_once_with ((fakelibvirt.VIR_CONNECT_LIST_DOMAINS_ACTIVE | fakelibvirt.VIR_CONNECT_LIST_DOMAINS_INACTIVE)) 
    self.assertEqual (len (doms), 4) 
    self.assertEqual (doms [0].name (), vm1.name ()) 
    self.assertEqual (doms [1].name (), vm2.name ()) 
    self.assertEqual (doms [2].name (), vm3.name ()) 
    self.assertEqual (doms [3].name (), vm4.name ()) 

    
    

    Fix the buggy line: self.assertEqual (len (vm1), 2)
assistant
#Here is Python program to fix the buggy line: self.

self.assertEqual (len (doms), 2)