MIT《Introduction to Computer Science and Programming》: Testing and Debugging

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1. testing

unit test: each piece of program independently(functions, classes)

integration: overall program

test suite: 1) small enough: we can test in reasonable amount of time. 2) large enough: to give us some confidence that the program is right

2. debugging

A large part of being a good programmer is learning how to debug.

A transferable skill.

not random: be systematic searching through the list.

how to be systematic:

1) study the program text & ask how could it have produced this result.

以不懂这段代码的心态去读它。不是问为什么没有得到自己想得到的结果，而是为什么会得到自己没有想要得到的这个结果。

2) is it a part of family?

3) how to fix it:

study available data

找出哪些数据会产生这个结果，哪些不会。

design & run a repeatable experiment: know the expected results

using binary search to get the bug(print values)

给代码分区一半一半地找

可以同时输出变量的值在代码对的情况下应该的是什么 what it should be?

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