Add dump tests template

CMakeLists.txt

@@ -42,6 +42,7 @@ add_executable(jsonc_tests
   tests/json_parser_malformed_json_tests.cpp
   tests/json_valid_json_tests.cpp
   tests/json_beautifier_tests.cpp
+  tests/json_dump_tests.cpp
 )
 
 target_link_libraries(jsonc_tests jsonc)

tests/json_dump_tests.cpp

@@ -0,0 +1,29 @@
+#include <gtest/gtest.h>
+
+#include <string>
+#include <memory>
+#include <utility>
+
+#include "json.h"
+
+class JsonDumpsTestingFixture: public ::testing::TestWithParam<std::pair<json::Json, std::string>> {};
+
+INSTANTIATE_TEST_SUITE_P(
+        JsonDumpTests,
+        JsonDumpsTestingFixture,
+        ::testing::Values(
+            // primitives
+            std::make_pair(json::Json::null(), "null")
+        )
+);
+
+TEST_P(JsonDumpsTestingFixture, JsonYieldsValidDump) {
+    const auto& pair = GetParam();
+
+    const auto& json = pair.first;
+    const auto& expected_json = pair.second;
+
+    const auto& opt_dumped_json = json::Json::toJson(json);
+
+    EXPECT_EQ(expected_json, opt_dumped_json);
+}