A股收盘，上证指数涨0.47%，报4182.59点。港股方面，恒生指数报26059.85点，跌2.14%；恒生科技指数报4989.37点，跌2.89%。
Many systems and monoliths that have been built a long time ago were also modular, but their modules were mostly based on the classical Three-tier Architecture. Such a setup has a low testability, because the Business layer required the Data Access Layer (DAL) to operate even in unit tests (or you had to do a code surgery to find seams, if there were ones).
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