The Law of construction (the first three chapters)

The first chapter: Software Engineering. Write software is code code written out, combining statements and algorithms to achieve the required functions. However, the development of software needs a certain step, team spirit, after the demand analysis to understand customer needs, what functions, and complete the software outline design, then discuss and communicate with customers. Then the software design, then program code writing, software testing debug, experience version, follow-up maintenance and so on. This is a project. Software development process is not simple, this is an engineering development process.

Chapter Two: I realize that personal development ability and the code that I write to myself are testing ability, which is very important. You want to optimize your code, or you want to quickly find bugs and improve the efficiency of your development. To ensure that the code written to a certain extent is correct, improve the robustness of the program, improve the reliability and stability of the program. And you can use the Unit Test tool to help with processing. Using unit tests to verify the correctness of the program on the most basic functions and parameters, test each parameter, including illegal input and error handling, to maintain the independence of the unit test.

Chapter Three: How do programmers grow? To accumulate knowledge of software development, accumulate the history of code writing, accumulate actual combat experience to enhance professional skills, master a variety of development platform. Accumulate experience from actual combat, exercise management ability, express and communicate ability, and team work ability. Write a good development document to enrich your own code writing process.

　　

For the first three chapters I have this question:

1. How do I improve the quality of my code?

What is the 2.JUnit working process? How is it tested?

3.IT industry Employment Test more evidence, better? Or you can have a selective examination of some gold-proof card? Which certificates have gold content?

The Law of construction (the first three chapters)