diff --git a/tests/core_tests/chaingen.cpp b/tests/core_tests/chaingen.cpp
index b15bdacc..01aa5f8b 100644
--- a/tests/core_tests/chaingen.cpp
+++ b/tests/core_tests/chaingen.cpp
@@ -2053,6 +2053,25 @@ bool check_ring_signature_at_gen_time(const std::vector<test_event_entry>& event
   return true;
 }
 
+bool check_mixin_value_for_each_input(size_t mixin, const crypto::hash& tx_id, currency::core& c)
+{
+  std::shared_ptr<const currency::transaction_chain_entry> ptce = c.get_blockchain_storage().get_tx_chain_entry(tx_id);
+  if (!ptce)
+    return false;
+
+  for (size_t i = 0; i < ptce->tx.vin.size(); ++i)
+  {
+    auto& input = ptce->tx.vin[i];
+    if (input.type() == typeid(txin_to_key))
+    {
+      auto& intk = boost::get<txin_to_key>(input);
+      CHECK_AND_ASSERT_MES(intk.key_offsets.size() == mixin + 1, false, "for input #" << i << " mixin count is " << intk.key_offsets.size() - 1 << ", expected is " << mixin);
+    }
+  }
+
+  return true;
+}
+
 //------------------------------------------------------------------------------
 
 void test_chain_unit_base::register_callback(const std::string& cb_name, verify_callback cb)
diff --git a/tests/core_tests/chaingen.h b/tests/core_tests/chaingen.h
index 6b9b4c04..7cbf4822 100644
--- a/tests/core_tests/chaingen.h
+++ b/tests/core_tests/chaingen.h
@@ -679,6 +679,7 @@ bool generate_pos_block_with_given_coinstake(test_generator& generator, const st
 bool check_ring_signature_at_gen_time(const std::vector<test_event_entry>& events, const crypto::hash& last_block_id, const currency::txin_to_key& in_t_k,
   const crypto::hash& hash_for_sig, const std::vector<crypto::signature> &sig);
 
+bool check_mixin_value_for_each_input(size_t mixin, const crypto::hash& tx_id, currency::core& c);
 
 //--------------------------------------------------------------------------
 template<class t_test_class>