Add an initial cjson fuzz test

Signed-off-by: Geoff Hutchison <[email protected]>

tests/io/CMakeLists.txt

@@ -51,3 +51,18 @@ foreach(TestName ${tests})
   add_test(NAME "Io-${TestName}"
     COMMAND AvogadroIOTests "--gtest_filter=${TestName}Test.*")
 endforeach()
+
+option(ENABLE_FUZZ "Enable fuzz testing." OFF)
+
+if(ENABLE_FUZZ)
+  add_definitions(-DFUZZTEST_FUZZING_MODE=on)
+  # fuzztest uses abseil-cpp
+  set(CMAKE_CXX_STANDARD 17)
+  set(CMAKE_CXX_VISIBILITY_PRESET default)
+  add_subdirectory(fuzztest)
+
+  fuzztest_setup_fuzzing_flags()
+  add_executable(AvogadroFuzzTests fuzztest.cpp)
+  target_link_libraries(AvogadroFuzzTests PRIVATE Avogadro::IO)
+  link_fuzztest(AvogadroFuzzTests)
+endif()

tests/io/fuzztest.cpp

@@ -0,0 +1,32 @@
+/******************************************************************************
+  This source file is part of the Avogadro project.
+  This source code is released under the 3-Clause BSD License, (see "LICENSE").
+******************************************************************************/
+
+#include "fuzztest/fuzztest.h"
+#include "iotests.h"
+
+#include <gtest/gtest.h>
+
+#include <avogadro/core/matrix.h>
+#include <avogadro/core/molecule.h>
+#include <avogadro/core/unitcell.h>
+
+#include <avogadro/io/cjsonformat.h>
+
+using Avogadro::Core::Molecule;
+using Avogadro::Io::CjsonFormat;
+
+static const std::string cjsonDir = std::string(AVOGADRO_DATA) + "/data/cjson/";
+
+void readCjson(const std::string& data)
+{
+  CjsonFormat cjson;
+  Molecule molecule;
+  bool success = cjson.readString(data, molecule);
+  EXPECT_TRUE(success);
+  EXPECT_EQ(cjson.error(), "");
+}
+
+FUZZ_TEST(AvogadroFuzzTests, readCjson)
+  .WithSeeds(fuzztest::ReadFilesFromDirectory(cjsonDir));