package interface_test

import (

"testing"

"github.com/expr-lang/expr"

"github.com/expr-lang/expr/internal/testify/assert"

)

type StoreInterface interface {

Get(string) int

}

type StoreImpt struct{}

func (f StoreImpt) Get(s string) int {

return 42

}

func (f StoreImpt) Set(s string, i int) bool {

return true

}

type Env struct {

Store StoreInterface `expr:"store"`

}

func TestInterfaceHide(t *testing.T) {

var env Env

p, err := expr.Compile(`store.Get("foo")`, expr.Env(env))

assert.NoError(t, err)

out, err := expr.Run(p, Env{Store: StoreImpt{}})

assert.NoError(t, err)

assert.Equal(t, 42, out)

_, err = expr.Compile(`store.Set("foo", 100)`, expr.Env(env))

assert.Error(t, err)

assert.Contains(t, err.Error(), "type interface_test.StoreInterface has no method Set")

}