How Can Go's `TestMain` Function Enable Global Test Setup and Teardown?

Global Test Setup with the Go Testing Package

In the testing package, overall test setup is not handled through an attribute like in other frameworks. Instead, the TestMain function provides a global hook for setup, teardown, and other control over the testing environment.

Implementation

To implement global test setup and teardown using TestMain:

func TestMain(m *testing.M) {
    setup()
    code := m.Run() 
    shutdown()
    os.Exit(code)
}

• setup() runs before any tests are executed.
• m.Run() executes the test suite.
• shutdown() runs after all tests have finished.

Usage

If a test file contains a TestMain function, it will be called instead of the individual test functions. The TestMain function can customize the test environment, control the order of tests, or check for leaked resources.

Benefits

• Provides a clean way to perform setup tasks before the tests start and teardown tasks after they finish.
• Allows for more flexible testing environments and control over test execution.
• Saves time and effort compared to duplicating setup and teardown code in individual test functions.

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