test: add integration test for 'gas init'

cmd/subcmd_init.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"bufio"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -32,8 +33,9 @@ var cmd_init = &cobra.Command{
 		// Get all the config values
 		get_val := func(prompt string, val *string) {
 			fmt.Printf("%s (%q): ", prompt, *val)
-			input := ""
-			Must(fmt.Scanln(&input))
+			scanner := bufio.NewScanner(os.Stdin)
+			scanner.Scan()
+			input := scanner.Text()
 			if input != "" {
 				*val = input
 			}