How Can I Use Go's `TestMain` for Global Test Setup and Teardown?

Set Up Test Environment Using the Go Testing Package

In Go, the testing package provides a convenient way to set up and execute unit tests. However, unlike other testing frameworks, it lacks a dedicated attribute for overall test setup.

Starting with Go 1.4, the testing package introduced TestMain as a solution for global test setup and teardown. This function is invoked before running any tests and can perform setup tasks, control the testing environment, or set up a child process.

To implement global setup and teardown:

func TestMain(m *testing.M) {
    setup() // Perform global setup
    code := m.Run() // Run the tests
    shutdown() // Perform global teardown
    os.Exit(code)
}

This approach allows you to centralize common setup and teardown routines, similar to the [SetUp] attribute in NUnit.

Further examples and use cases for TestMain can be found in the official documentation and third-party resources:

• [Go Testing Framework "TestMain" Feature](https://blog.golang.org/testing-with-gotest)
• [TestMain in Go: A Global Hook for Enhanced Testing](https://dev.to/jimmyfraschetti/testmain-in-go-a-global-hook-for-enhanced-testing-2p2e)

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