Merge #18353: tests: Add fuzzing harnesses for classes CBlockHeader, CFeeRate and various functions

44abf417eb1cd8598084eee1a429ca57c7d0579a tests: Add fuzzing harness for various functions taking std::string as input (practicalswift)
d69145acb76ff12b7c5c1e55ce89e14bc6453904 tests: Add fuzzing harness for MultiplicationOverflow(...) (practicalswift)
7726f3bc4671fbc23e5bc31d0eb9fe381e2f07ef tests: Add fuzzing harness for CFeeRate (practicalswift)
0579a276307d22ae62ecbcaa704e8477274e784d tests: Add fuzzing harness for CBlockHeader (practicalswift)
cb4eec13c03089617a94169b4e30381d87788b56 tests: Add fuzzing harness for count_seconds(...) (practicalswift)

Pull request description:

  Add fuzzing harnesses for classes `CBlockHeader`, `CFeeRate` and various functions.

  To test this PR:

  ```
  $ make distclean
  $ ./autogen.sh
  $ CC=clang CXX=clang++ ./configure --enable-fuzz \
        --with-sanitizers=address,fuzzer,undefined
  $ make
  $ src/test/fuzz/block_header
  ^c (ctrl-c)
  $ src/test/fuzz/fee_rate
  ^c (ctrl-c)
  $ src/test/fuzz/integer
  ^c (ctrl-c)
  $ src/test/fuzz/multiplication_overflow
  ^c (ctrl-c)
  $ src/test/fuzz/string
  ^c (ctrl-c)
  ```

ACKs for top commit:
  MarcoFalke:
    ACK 44abf417eb1cd8598084eee1a429ca57c7d0579a 🏉

Tree-SHA512: 2b382a7bc8efdcc6dd8b79f1637f194ecdca3e522c6618ae6c4b0bf6f86d2e79b1bb1c7160522083600616d1ed509b2f577f3a512ea3a7825a0a3794578d9d90

1 files changed, 4 insertions, 0 deletions

diff --git a/src/test/fuzz/integer.cpp b/src/test/fuzz/integer.cpp
index 980042e81..24459c21b 100644
--- a/src/test/fuzz/integer.cpp
+++ b/src/test/fuzz/integer.cpp
@@ -23,6 +23,7 @@
 #include <streams.h>
 #include <test/fuzz/FuzzedDataProvider.h>
 #include <test/fuzz/fuzz.h>
+#include <time.h>
 #include <uint256.h>
 #include <util/moneystr.h>
 #include <util/strencodings.h>
@@ -31,6 +32,7 @@
 #include <version.h>
 
 #include <cassert>
+#include <chrono>
 #include <limits>
 #include <vector>
 
@@ -124,6 +126,8 @@ void test_one_input(const std::vector<uint8_t>& buffer)
             assert(parsed_money == i64);
         }
     }
+    const std::chrono::seconds seconds{i64};
+    assert(count_seconds(seconds) == i64);
 
     const arith_uint256 au256 = UintToArith256(u256);
     assert(ArithToUint256(au256) == u256);