test: Mock IBD in net_processing fuzzers

src/test/util/validation.cpp

@@ -0,0 +1,22 @@
+// Copyright (c) 2020 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <test/util/validation.h>
+
+#include <util/check.h>
+#include <util/time.h>
+#include <validation.h>
+
+void TestChainState::ResetIbd()
+{
+    m_cached_finished_ibd = false;
+    assert(IsInitialBlockDownload());
+}
+
+void TestChainState::JumpOutOfIbd()
+{
+    Assert(IsInitialBlockDownload());
+    m_cached_finished_ibd = true;
+    Assert(!IsInitialBlockDownload());
+}