human
Solve the following python programming problem given the following code:
@ patch ('changes.models.Repository.get_vcs') 
def test_simple(self, get_vcs) : 
    all_hash_chars = 'abcdefgh' 
    hash_chars_with_tests = 'abcfgh' 
    def log_results(parent = None, branch = None, offset = 0, limit = 1) : 
        def result(id) : 
            return RevisionResult (id = id, message = 'hello world', author = 'Foo <foo@example.com>', author_date = datetime (2013, 9, 19, 22, 15, 21)) 
return iter ([result ((c * 40)) for c in all_hash_chars] [offset : (offset + limit)]) 
fake_vcs = Mock (spec = Vcs) 
    fake_vcs.log.side_effect = log_results 
    get_vcs.return_value = fake_vcs 
    fake_id = uuid4 () 
    project = self.create_project () 
    def create_parent_group(revision_sha) : 
        return self.create_test (job = self.create_job (self.create_build (project = project, status = Status.finished, result = Result.passed, source = self.create_source (project = project, revision_sha = revision_sha))), name = 'foo') 
parent_groups = { c : create_parent_group ((c * 40)) for c in hash_chars_with_tests } 
    path = '/api/0/projects/{0}/tests/{1}/history/'.format (fake_id.hex, parent_groups ['a'].name_sha) 
    resp = self.client.get (path) 
    assert (resp.status_code == 404) 
    path = '/api/0/projects/{0}/tests/{1}/history/'.format (project.id.hex, fake_id.hex) 
    resp = self.client.get (path) 
    assert (resp.status_code == 404) 
    path = '/api/0/projects/{0}/tests/{1}/history/'.format (project.id.hex, parent_groups ['a'].name_sha) 
    resp = self.client.get (path) 
    assert (resp.status_code == 200) 
    data = self.unserialize (resp) 
    assert (len (data) == 8) 
    for (i, parent_group_key) in enumerate (all_hash_chars) : 
        if (parent_group_key in hash_chars_with_tests) : 
            assert (data [i] ['id'] == parent_groups [parent_group_key].id.hex) 
else : 
            assert (data [i] is None) 
path = '/api/0/projects/{0}/tests/{1}/history/?per_page=1'.format (project.id.hex, parent_groups ['a'].name_sha) 
    resp = self.client.get (path) 
    assert...

    
    

    Fix the buggy line: assert (len (i) == 1)
assistant
#Here is Python code to fix the buggy line: assert (len (i) == 1)
.

assert (len (data) == 1)