def test_add_and_remove():
"""测试添加WinFile和删除WinFile的方法是否正常工作。
"""
fc = FileCollection()
fc.add(__file__)
assert fc.howmany == 1
fc.remove(__file__)
assert fc.howmany == 0
def test_add():
"""测试两个集合相加是否正常工作。
"""
fc1 = FileCollection.from_path(dir_path)
fc2 = FileCollection.from_path(dir_path)
fc3 = FileCollection()
fc3.add(__file__)
fc = fc1 + fc2 + fc3
assert fc.howmany == 5
fc = FileCollection.sum([fc1, fc2, fc3])
assert fc.howmany == 5