[#987] morph/event: Add RemoveNode event and its parser

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

pkg/morph/event/subnet/remove_node_test.go

@@ -0,0 +1,57 @@
+package subnet
+
+import (
+	"testing"
+
+	"github.com/nspcc-dev/neo-go/pkg/core/state"
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	"github.com/nspcc-dev/neo-go/pkg/rpc/response/result/subscriptions"
+	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
+	subnetid "github.com/nspcc-dev/neofs-sdk-go/subnet/id"
+	"github.com/stretchr/testify/require"
+)
+
+func TestParseRemoveNode(t *testing.T) {
+	t.Run("wrong number of arguments", func(t *testing.T) {
+		_, err := ParseRemoveNode(createNotifyEventFromItems([]stackitem.Item{}))
+		require.Error(t, err)
+	})
+
+	t.Run("invalid item type", func(t *testing.T) {
+		args := []stackitem.Item{stackitem.NewMap(), stackitem.Make(123)}
+		_, err := ParseRemoveNode(createNotifyEventFromItems(args))
+		require.Error(t, err)
+	})
+
+	subnetID := subnetid.ID{}
+	subnetID.SetNumber(123)
+
+	rawSubnetID, err := subnetID.Marshal()
+	require.NoError(t, err)
+
+	priv, err := keys.NewPrivateKey()
+	require.NoError(t, err)
+
+	pub := priv.PublicKey()
+
+	t.Run("good", func(t *testing.T) {
+		args := []stackitem.Item{stackitem.NewByteArray(rawSubnetID), stackitem.Make(pub.Bytes())}
+
+		e, err := ParseRemoveNode(createNotifyEventFromItems(args))
+		require.NoError(t, err)
+
+		gotRaw := e.(RemoveNode).SubnetworkID()
+		require.NoError(t, err)
+
+		require.Equal(t, rawSubnetID, gotRaw)
+		require.Equal(t, pub.Bytes(), e.(RemoveNode).Node())
+	})
+}
+
+func createNotifyEventFromItems(items []stackitem.Item) *subscriptions.NotificationEvent {
+	return &subscriptions.NotificationEvent{
+		NotificationEvent: state.NotificationEvent{
+			Item: stackitem.NewArray(items),
+		},
+	}
+}