When you want to set an environment variable in a Go test, you can use the os.Setenv function. If you have multiple tests, you want to ensure the environment variable is unset after the test. This can be done with a defer call to the os.Unsetenv function:

package main_test

import (
    "testing"

    "github.com/stretchr/testify/assert"
)

func Test_UsingEnvvar(t *testing.T) {

    os.Setenv("ENV_VAR", "value")
    defer os.Unsetenv("ENV_VAR")

    actual := os.Getenv("ENV_VAR")
    assert.Equals(t, "value", actual)

}

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