The Ensure class is analogous to JUnit or TestNG's Assert type; however, it adds a series of methods that facilitate a more readable API (this is often called literate programming).
Ensure类类似于JUnit或TestNG的Assert类型；但是，它增加了一系列方法，提供了更具可读性的API（这常被称作文学编程）。
Type into the member function Main a few lines of code to create an instance of Quad and then assert that when the object Area method is given a length of 3 and width of 2, it returns the value 6.
在主函数中输入下列几行代码，创建Quad实例，并通过Assert断言，当长宽各为3和2时，返回的结果应该是6。
Type into the member function Main a few lines of code to create an instance of Quad and then assert that when the object Area method is given a length of 3 and width of 2, it returns the value 6.
在主函数中输入下列几行代码，创建Quad实例，并通过Assert断言，当长宽各为3和2时，返回的结果应该是6。
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