How to use Golang's golang.org/x/exp/rand package for randomization testing?

Yes, randomization testing can be performed using the golang.org/x/exp/rand package. The specific steps are as follows: Install the package: go get golang.org/x/exp/rand Create a random seed: seed := rand. Seed(time.Now().Unix()) creates a random number generator using a seed: rng := rand.NewRand(seed) generates random data: rng.Intn(100)

How to use Golang’s golang.org/x/exp/rand package for randomized testing

When writing Golang tests, the randomized test is Crucial as it can help reduce brittle testing due to potentially deterministic behavior. golang.org/x/exp/rand The package provides powerful random number generation capabilities that can be used for this purpose.

Installation

First, make sure you have installed the golang.org/x/exp/rand package. Use the following command:

go get golang.org/x/exp/rand

Create a random seed

In Golang, using a random number generator requires a random seed. golang.org/x/exp/rand The package provides the Seed function, which creates a random number generator that generates random numbers from a given source.

import (
    "golang.org/x/exp/rand"
)

// 创建一个随机种子
seed := rand.Seed(time.Now().Unix())

Using a random number generator

After creating a random seed, use the NewRand function to create a random number generator that will use given seed.

// 创建一个随机数生成器
rng := rand.NewRand(seed)

Now, you can use rng to generate various types of random numbers. golang.org/x/exp/rand Provides a variety of methods to generate floating point numbers, integers, Boolean values, etc.

Practical Case

Consider the following test case, which uses the golang.org/x/exp/rand package to generate random data to test a function :

import (
    "fmt"
    "math/rand"
    "testing"
)

func TestMyFunction(t *testing.T) {
    // 创建一个随机数种子以进行随机化测试
    seed := rand.Seed(time.Now().UnixNano())
    rng := rand.NewRand(seed)

    // 生成随机输入数据
    input := make([]int, 10)
    for i := range input {
        input[i] = rng.Intn(100)
    }
    fmt.Println(input)

    // 调用要测试的函数
    result := MyFunction(input)

    // 断言结果
    // ...
}

Conclusion

By using the golang.org/x/exp/rand package, developers can easily integrate randomized tests to Golang testing. This is essential for writing more robust and reliable tests, helping to reduce brittle tests caused by deterministic behavior.

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