scripts: add test for compare-dumps script

scripts/compare-dumps.go

@@ -15,7 +15,7 @@ import (
 	"github.com/urfave/cli"
 )
 
-var ledgerContractID = -2
+var ledgerContractID = -4
 
 type dump []blockDump
 

scripts/compare-dumps_test.go

@@ -0,0 +1,13 @@
+package main
+
+import (
+	"testing"
+
+	"github.com/nspcc-dev/neo-go/pkg/core/native"
+	"github.com/stretchr/testify/require"
+)
+
+func TestCompatibility(t *testing.T) {
+	cs := native.NewContracts(false, map[string][]uint32{})
+	require.Equal(t, cs.Ledger.ID, int32(ledgerContractID))
+}