How to set coverage target for golang function?

Use the CoverPackage function to set the coverage target: Set the target for the package to be covered. Specify the package for collecting coverage data. Call CoverPackage in the init() function. By setting goals, we can improve the quality of our application by identifying code that is not covered by our tests.

How to set the coverage target of Golang function

Introduction

Code coverage Rate measures how much of the source code is executed by the test code. It helps identify code paths not covered by tests, thereby improving the quality and stability of your application.

In Go, we can easily set function coverage goals using the testing package.

Set the target

Use the coverpkg function to set the coverage target:

import (
    "os"
    "testing"
)

func init() {
    if val := os.Getenv("COVERPKG"); val != "" {
        testing.CoverPackage(val, val)  // 为给定包设置覆盖率目标
    }
}

We can do it in init() Call CoverPackage in the function, just like in the example above. The first parameter specifies the package to cover, and the second parameter specifies the package used to collect coverage data.

Practical case

Consider the following multiply function:

package mypkg

// Multiply multiplies two numbers.
func Multiply(x, y int) int {
    return x * y
}

To set the Multiply function Coverage target, we can update the init function as follows:

package mypkg

import (
    "os"
    "testing"
)

func init() {
    if val := os.Getenv("COVERPKG"); val != "" {
        testing.CoverPackage("mypkg", "mypkg")
    }
}

Now, when we run the test, the CoverPackage will collect the Multiply function's coverage data and stores it in the cover.out file.

Conclusion

By using the coverpkg function, we can easily set the coverage target for Golang functions. This helps us identify code that is not covered by our tests, thereby improving the quality of our application.

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