I am developing an web app with Go. So far so good, but now I am integrating Wercker as a CI tool and started caring about testing. But my app relies heavily on Cobra/Viper configuration/flags/environment_variables scheme, and I do not know how to properly init Viper values before running my test suite. Any help would be much appreciated.
When I use Cobra/Viper or any other combination of CLI helpers, my way of doing this is to have the CLI tool run a function whose sole purpose will be to get arguments and pass them to another method who will do the actual work.
Here is a short (and dumb) example using Cobra :
package main
import (
"fmt"
"os"
"github.com/spf13/cobra"
)
func main() {
var Cmd = &cobra.Command{
Use: "boom",
Short: "Explode all the things!",
Run: Boom,
}
if err := Cmd.Execute(); err != nil {
fmt.Println(err)
os.Exit(-1)
}
}
func Boom(cmd *cobra.Command, args []string) {
boom(args...)
}
func boom(args ...string) {
for _, arg := range args {
println("boom " + arg)
}
}
Here, the Boom
function is hard to test, but the boom
one is easy.
You can see another (non-dumb) example of this here (and the correspond test here).