package erasurecode_test

import (
	"testing"

	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/erasurecode"
	"github.com/stretchr/testify/require"
)

func TestErasureConstruct(t *testing.T) {
	t.Run("negative, no panic", func(t *testing.T) {
		_, err := erasurecode.NewConstructor(-1, 2)
		require.ErrorIs(t, err, erasurecode.ErrInvShardNum)
	})
	t.Run("negative, no panic", func(t *testing.T) {
		_, err := erasurecode.NewConstructor(2, -1)
		require.ErrorIs(t, err, erasurecode.ErrInvShardNum)
	})
	t.Run("zero parity", func(t *testing.T) {
		_, err := erasurecode.NewConstructor(1, 0)
		require.NoError(t, err)
	})
	t.Run("max shard num", func(t *testing.T) {
		_, err := erasurecode.NewConstructor(erasurecode.MaxShardCount, 0)
		require.NoError(t, err)
	})
	t.Run("max+1 shard num", func(t *testing.T) {
		_, err := erasurecode.NewConstructor(erasurecode.MaxShardCount+1, 0)
		require.ErrorIs(t, err, erasurecode.ErrMaxShardNum)
	})
}