Assertions are most valuable for testing operations whose results are not obvious from a quick visual inspection.
断言对于测试快速直观检查时结果不明显的操作最有价值。
Without known consumer requirements, it may be difficult to provide correct functionality and there is a danger of expending development and testing effort to produce operations that will not be used.
如果不知道使用者需求，则可能很难提供正确的功能，因此就有可能存在将开发和测试工作浪费在提供将不会使用的操作上的风险。
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