How Can I Skip Go Test Files Based on the Go Version?

Skipping Test Files Based on Go Version

Problem:

You have a test file that relies on functionality only available in Go 1.5 or higher. You want to prevent the file from being built and tested on systems running Go 1.4 or below.

Solution:

1. Use Build Constraints:

The build constraint feature allows you to specify the minimum Go version required to compile a particular file. To use it, add the following line at the top of your test file:

// +build go1.5

This constraint will ensure that the file is only compiled on systems running Go 1.5 or higher. Note that you may need to specify a higher version number if your tests require functionality added in a later Go release.

2. Custom Check in Test File:

Alternatively, you can implement a custom check within your test file to skip tests based on the Go version:

package yourpackage

import (
    "fmt"
    "os"
    "runtime"
)

func TestExample(t *Testing.T) {
    ver := runtime.Version()
    if ver[2:4] < "1.5" {
        t.Skipf("Skipping test on Go version %s", ver)
    }

    // Run tests
}

This code retrieves the Go version and skips the test if the version is less than 1.5.

Caveats:

• The build constraint method is more reliable as it prevents the file from being compiled on unsupported systems.
• The custom skip check method can be useful if you need more flexibility, but it relies on your own code to determine the Go version.
• Make sure to place the build constraint or custom check at the very top of the file, before any other code.

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