Merge pull request #20 from Progmasoft/feature/catch3-json

Read the options of a project from catch3.json

2 files changed, 31 insertions, 1 deletions

diff --git a/fuzzing/CMakeLists.txt b/fuzzing/CMakeLists.txt
index 05591520..c5b71e9c 100644
--- a/fuzzing/CMakeLists.txt
+++ b/fuzzing/CMakeLists.txt
@@ -20,7 +20,7 @@ foreach(fuzzer TestSpecParser)
 endforeach()
 
 # Progmasoft's fuzzers live apart, under their own license header.
-foreach(fuzzer RunnerJson RunnerOptions)
+foreach(fuzzer ProjectConfig RunnerJson RunnerOptions)
   add_executable(fuzz_${fuzzer} Progmasoft/fuzz_${fuzzer}.cpp)
   target_link_libraries(fuzz_${fuzzer} PRIVATE fuzzhelper)
 endforeach()
diff --git a/fuzzing/Progmasoft/fuzz_ProjectConfig.cpp b/fuzzing/Progmasoft/fuzz_ProjectConfig.cpp
new file mode 100644
index 00000000..0c43f550
--- /dev/null
+++ b/fuzzing/Progmasoft/fuzz_ProjectConfig.cpp
@@ -0,0 +1,30 @@
+// Copyright (c) 2026 Progmasoft.
+// SPDX-License-Identifier: MPL-2.0 WITH AdditionRef-Progmasoft-Exception-1.1
+
+// The text of a catch3.json. Reading it must give options or an error, never
+// crash, and the worker arguments derived from the options must parse again.
+
+#include <Progmasoft/Runner/Options.hpp>
+#include <Progmasoft/Runner/ProjectConfig.hpp>
+
+#include <cstdint>
+#include <cstdlib>
+#include <string_view>
+
+extern "C" int
+LLVMFuzzerTestOneInput(const std::uint8_t *data, std::size_t size)
+{
+    namespace Runner = Progmasoft::Catch3::Runner;
+    const std::string_view text{reinterpret_cast<const char *>(data), size};
+    auto options = Runner::ApplyProjectConfig(text, "project", "catch3.json");
+    if (options)
+    {
+        const auto worker =
+            Runner::ParseOptions(Runner::WorkerArguments(*options));
+        if (!worker)
+        {
+            std::abort();
+        }
+    }
+    return 0;
+}