From 943d435cd278328b183a79d07c841580bf7b5adb Mon Sep 17 00:00:00 2001
From: Roman Khimov <roman@nspcc.ru>
Date: Thu, 7 May 2020 21:46:28 +0300
Subject: [PATCH] core: ensure we produce correct blocks for tests

Blocks must have at least one transaction and we should check for correct
merkle root generation.
---
 pkg/core/helper_test.go | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/pkg/core/helper_test.go b/pkg/core/helper_test.go
index f1e8e1657..f6300c492 100644
--- a/pkg/core/helper_test.go
+++ b/pkg/core/helper_test.go
@@ -59,6 +59,9 @@ func newBlock(cfg config.ProtocolConfiguration, index uint32, prev util.Uint256,
 	witness := transaction.Witness{
 		VerificationScript: valScript,
 	}
+	if len(txs) == 0 {
+		txs = []*transaction.Transaction{newMinerTX()}
+	}
 	b := &block.Block{
 		Base: block.Base{
 			Version:       0,
@@ -71,7 +74,10 @@ func newBlock(cfg config.ProtocolConfiguration, index uint32, prev util.Uint256,
 		},
 		Transactions: txs,
 	}
-	_ = b.RebuildMerkleRoot()
+	err := b.RebuildMerkleRoot()
+	if err != nil {
+		panic(err)
+	}
 
 	invScript := make([]byte, 0)
 	for _, wif := range privNetKeys {