package fs

import (
	"testing"

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

func TestStatePush(t *testing.T) {
	assert.Equal(t, "", StatePush(""))
	assert.Equal(t, "", StatePush("", ""))
	assert.Equal(t, "a", StatePush("", "a"))
	assert.Equal(t, "a,1，2，3", StatePush("", "a", "1,2,3"))

	assert.Equal(t, "potato", StatePush("potato"))
	assert.Equal(t, ",potato", StatePush("potato", ""))
	assert.Equal(t, "a,potato", StatePush("potato", "a"))
	assert.Equal(t, "a,1，2，3,potato", StatePush("potato", "a", "1,2,3"))
}

func TestStatePop(t *testing.T) {
	state, value := StatePop("")
	assert.Equal(t, "", value)
	assert.Equal(t, "", state)

	state, value = StatePop("a")
	assert.Equal(t, "a", value)
	assert.Equal(t, "", state)

	state, value = StatePop("a,1，2，3")
	assert.Equal(t, "a", value)
	assert.Equal(t, "1，2，3", state)

	state, value = StatePop("1，2，3,a")
	assert.Equal(t, "1,2,3", value)
	assert.Equal(t, "a", state)
}