[#296] morph: Add parser unit tests

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/morph/event/utils_test.go

@@ -0,0 +1,48 @@
+package event
+
+import (
+	"math/big"
+	"testing"
+
+	"github.com/nspcc-dev/neo-go/pkg/core/state"
+	"github.com/nspcc-dev/neo-go/pkg/util"
+	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
+	"github.com/stretchr/testify/require"
+)
+
+func TestParseStackArray(t *testing.T) {
+	t.Run("success", func(t *testing.T) {
+		arr := &stackitem.Array{}
+		arr.Append(stackitem.NewBigInteger(big.NewInt(1)))
+		arr.Append(stackitem.NewBigInteger(big.NewInt(2)))
+		ev := &state.ContainedNotificationEvent{
+			Container: util.Uint256{67},
+			NotificationEvent: state.NotificationEvent{
+				ScriptHash: util.Uint160{69},
+				Name:       "name",
+				Item:       arr,
+			},
+		}
+
+		items, err := ParseStackArray(ev)
+		require.NoError(t, err, "failed to parse event items")
+		require.Equal(t, 2, len(items), "invalid length")
+		require.Equal(t, stackitem.NewBigInteger(big.NewInt(1)), items[0], "invalid item 0")
+		require.Equal(t, stackitem.NewBigInteger(big.NewInt(2)), items[1], "invalid item 0")
+	})
+	t.Run("empty stack error", func(t *testing.T) {
+		arr := &stackitem.Array{}
+		ev := &state.ContainedNotificationEvent{
+			Container: util.Uint256{67},
+			NotificationEvent: state.NotificationEvent{
+				ScriptHash: util.Uint160{69},
+				Name:       "name",
+				Item:       arr,
+			},
+		}
+
+		items, err := ParseStackArray(ev)
+		require.ErrorIs(t, err, errEmptyStackArray, "invalid empty array error")
+		require.Equal(t, 0, len(items), "items was returned")
+	})
+}