chore: import upstream snapshot with attribution

tests/peg-parser/tests.h

@@ -0,0 +1,25 @@
+#pragma once
+
+// Common includes for all test files
+#include <nlohmann/json.hpp>
+#include <string>
+#include <vector>
+
+#include "../testing.h"
+#include "peg-parser.h"
+#include "chat-peg-parser.h"
+#include "simple-tokenize.h"
+
+struct bench_tool_call {
+    std::string            id;
+    std::string            name;
+    nlohmann::ordered_json args;
+};
+
+// Test function declarations
+void test_basic(testing &t);
+void test_json_parser(testing &t);
+void test_gbnf_generation(testing &t);
+void test_unicode(testing &t);
+void test_json_serialization(testing &t);
+void test_python_dict_parser(testing &t);