func assert(t *testing.T, condition bool, msg string, v ...interface{}) {
	if !condition {
		_, file, line, _ := runtime.Caller(1)
		fmt.Printf("%s:%d: "+msg+"\n", append([]interface{}{filepath.Base(file), line}, v...)...)
		t.FailNow()
	}
}
assert fails the test if the condition is false.
package quote
import (
	"fmt"
	"path/filepath"
	"reflect"
	"runtime"
	"testing"
)