config-example.go

package main

import (
    "fmt"
    "os"
)

type config struct {
    V string
    X string
}

func (c *config) isValid() bool {
    if c.X == "" {
        return false
    }
    if c.V == "" {
        return false
    }
    return true
}

func main() {
    c := config{
        os.Getenv("TEST1"),
        os.Getenv("TEST2"),
    }
    fmt.Println(c.isValid())
}