package billing_errors

import (
	"errors"
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestErrorIs(t *testing.T) {
	assert := assert.New(t)
	err := NewInvalidInputError(nil)
	assert.NotNil(err)
	assert.True(errors.Is(err, InvalidInputError))
	assert.False(errors.Is(err, SystemError))
	assert.True(errors.As(err, &BaseError{}))
}