How to write golang unit test

The go language attaches great importance to unit testing, not to mention the background of other authors, open source libraries, third-party support, etc., there are two points The point that allows me to pay attention to the GO language about unit testing is:

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The Go language comes with unit testing commands

From these two points, I think testing plays a very important role in the Go language, so in this article, I Also try to talk about Go language unit testing.

Writing Go unit test code

Go's testing method seems relatively low-level. It relies on the command go test and some test functions that can be run with go test. Write a convention. However, I think this is the so-called Go style. Since using Go, my feeling is that the Go language is a language that maintains the C language programming habits.

Golang language provides a set of unit test writing specifications. Let’s briefly demonstrate this writing method

## Unit test files must end with .go

The test function is very simple

calc.go

calc_test.go

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