tests: Add ParseScript(...) (core_io) fuzzing harness

src/test/fuzz/parse_script.cpp

@@ -0,0 +1,16 @@
+// Copyright (c) 2009-2019 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 <core_io.h>
+#include <script/script.h>
+#include <test/fuzz/fuzz.h>
+
+void test_one_input(const std::vector<uint8_t>& buffer)
+{
+    const std::string script_string(buffer.begin(), buffer.end());
+    try {
+        (void)ParseScript(script_string);
+    } catch (const std::runtime_error&) {
+    }
+}