Merge pull request #15 from Progmasoft/feature/catch3-runner

Replace Catch2's runner with the Catch3 runner

2 files changed, 79 insertions, 0 deletions

diff --git a/fuzzing/Progmasoft/fuzz_RunnerJson.cpp b/fuzzing/Progmasoft/fuzz_RunnerJson.cpp
new file mode 100644
index 00000000..4cc3770c
--- /dev/null
+++ b/fuzzing/Progmasoft/fuzz_RunnerJson.cpp
@@ -0,0 +1,29 @@
+// Copyright (c) 2026 Progmasoft.
+// SPDX-License-Identifier: MPL-2.0 WITH AdditionRef-Progmasoft-Exception-1.1
+
+// The runner reads JSON from its workers, from history files and from
+// reports; none of them may crash it. A document that parses must also
+// print and parse back to the same text.
+
+#include <Progmasoft/Runner/Json.hpp>
+
+#include <cstdint>
+#include <cstdlib>
+#include <string_view>
+
+extern "C" int
+LLVMFuzzerTestOneInput(const std::uint8_t *data, std::size_t size)
+{
+    const std::string_view text{reinterpret_cast<const char *>(data), size};
+    auto parsed = Progmasoft::Catch3::Runner::ParseJson(text);
+    if (parsed)
+    {
+        const auto printed = parsed->ToString();
+        auto again = Progmasoft::Catch3::Runner::ParseJson(printed);
+        if (!again || again->ToString() != printed)
+        {
+            std::abort();
+        }
+    }
+    return 0;
+}
diff --git a/fuzzing/Progmasoft/fuzz_RunnerOptions.cpp b/fuzzing/Progmasoft/fuzz_RunnerOptions.cpp
new file mode 100644
index 00000000..2a10ba91
--- /dev/null
+++ b/fuzzing/Progmasoft/fuzz_RunnerOptions.cpp
@@ -0,0 +1,50 @@
+// Copyright (c) 2026 Progmasoft.
+// SPDX-License-Identifier: MPL-2.0 WITH AdditionRef-Progmasoft-Exception-1.1
+
+// The command line of a test binary: arguments separated by NUL bytes. The
+// parser must answer with options or an error, never crash, and the worker
+// arguments it derives must parse again.
+
+#include <Progmasoft/Runner/Options.hpp>
+
+#include <cstdint>
+#include <cstdlib>
+#include <string>
+#include <vector>
+
+extern "C" int
+LLVMFuzzerTestOneInput(const std::uint8_t *data, std::size_t size)
+{
+    std::vector<std::string> arguments(1);
+    for (std::size_t index = 0; index < size; ++index)
+    {
+        if (data[index] == 0)
+        {
+            arguments.emplace_back();
+        }
+        else
+        {
+            arguments.back().push_back(static_cast<char>(data[index]));
+        }
+    }
+    // Reading a file named by --input-file is not what is fuzzed here.
+    for (const auto &argument : arguments)
+    {
+        if (argument.find("input-file") != std::string::npos ||
+            (argument.size() >= 2 && argument[0] == '-' && argument[1] == 'f'))
+        {
+            return 0;
+        }
+    }
+    auto options = Progmasoft::Catch3::Runner::ParseOptions(arguments);
+    if (options)
+    {
+        const auto worker = Progmasoft::Catch3::Runner::ParseOptions(
+            Progmasoft::Catch3::Runner::WorkerArguments(*options));
+        if (!worker)
+        {
+            std::abort();
+        }
+    }
+    return 0;
+}