def test_insert():
"""
To test command_insert method
:return: Test result
"""
print("Testing insert......")
test_case = Editor()
# test case 1: insert a text into the list
test_case.command_read('text.txt')
test_case.command_insert(1)
assert test_case.list[
1] == 'hello', "Insert method does not work as expect!"
test_case.command_print('')
def test_insert_fail():
# test cast 2 : index out of range
test_case = Editor()
test_case.command_insert(100)