core: add nativenames.IsValid

pkg/core/native/nativenames/names.go

@@ -14,3 +14,18 @@ const (
 	CryptoLib   = "CryptoLib"
 	StdLib      = "StdLib"
 )
+
+// IsValid checks that name is a valid native contract's name.
+func IsValid(name string) bool {
+	return name == Management ||
+		name == Ledger ||
+		name == Neo ||
+		name == Gas ||
+		name == Policy ||
+		name == Oracle ||
+		name == Designation ||
+		name == Notary ||
+		name == NameService ||
+		name == CryptoLib ||
+		name == StdLib
+}

pkg/core/native/nativenames_test.go

@@ -0,0 +1,19 @@
+package native
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/nspcc-dev/neo-go/pkg/core/native/nativenames"
+	"github.com/stretchr/testify/require"
+)
+
+func TestNativenamesIsValid(t *testing.T) {
+	// test that all native names has been added to IsValid
+	contracts := NewContracts(true)
+	for _, c := range contracts.Contracts {
+		require.True(t, nativenames.IsValid(c.Metadata().Name), fmt.Errorf("add %s to nativenames.IsValid(...)", c))
+	}
+
+	require.False(t, nativenames.IsValid("unkonwn"))
+}