[#205] object: Initial EC implementation

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

object/erasurecode/constructor_test.go

@@ -0,0 +1,31 @@
+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)
+	})
+}