Merge #20332: test: Mock IBD in net_processing fuzzers

fa4234d877ea3193bfd0e18ff68dcb8fb84b47b5 test: Mock IBD in net_processing fuzzers (MarcoFalke)

Pull request description:

  Without this the fuzzers fail to detect trivial crasher bugs, such as https://github.com/bitcoin/bitcoin/pull/20317#issuecomment-723047111

ACKs for top commit:
  practicalswift:
    Tested ACK fa4234d877ea3193bfd0e18ff68dcb8fb84b47b5

Tree-SHA512: ce5da5c0a604b7559805a98ffdde882b44ca4f91b003b493d6e1be230714ce4cccb11dbfc1fc175f9d8fc779551c0a4103ceb4b473552928207d7d78ae329e10

1 files changed, 22 insertions, 0 deletions

diff --git a/src/test/util/validation.cpp b/src/test/util/validation.cpp
new file mode 100644
index 0000000000..1aed492c3c
--- /dev/null
+++ b/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());
+}