run built test suite source with godog command

builder.go

@@ -18,12 +18,10 @@ var mainTpl = `package main
 
 import (
 	"github.com/DATA-DOG/godog"
-	"os"
 )
 
 func main() {
 	godog.Run()
-	os.Exit(0)
 }
 `
 

cmd/godog/main.go

@@ -1,7 +1,10 @@
 package main
 
 import (
+	"log"
 	"os"
+	"os/exec"
+	"strings"
 
 	"github.com/DATA-DOG/godog"
 )
@@ -26,4 +29,11 @@ func main() {
 		panic(err)
 	}
 	w.Close()
+
+	cmd := strings.TrimSpace("go run " + builtFile + " " + strings.Join(os.Args[1:], " "))
+	out, err := exec.Command("sh", "-c", cmd).CombinedOutput()
+	if err != nil {
+		panic(err)
+	}
+	log.Println("output:", string(out))
 }

runner.go

@@ -1,7 +1,15 @@
 package godog
 
-import "log"
+import (
+	"fmt"
+	"log"
+)
 
-func Run() {
-	log.Println("running godoc, num registered steps:", len(stepHandlers))
+func Run() error {
+	log.Println("running godoc, num registered steps:", len(stepHandlers), "color test:", red("red"))
+	return nil
+}
+
+func red(s string) string {
+	return fmt.Sprintf("\033[31m%s\033[0m", s)
 }