Run all tests with C++11 enabled (#1820)

extras/tests/MixedConfiguration/CMakeLists.txt

@@ -19,6 +19,8 @@ add_executable(MixedConfigurationTests
 	issue1707.cpp
 	use_double_0.cpp
 	use_double_1.cpp
+	use_long_long_0.cpp
+	use_long_long_1.cpp
 )
 
 set_target_properties(MixedConfigurationTests PROPERTIES UNITY_BUILD OFF)

extras/tests/MixedConfiguration/use_long_long_0.cpp

@@ -0,0 +1,16 @@
+#define ARDUINOJSON_USE_LONG_LONG 0
+#include <ArduinoJson.h>
+
+#include <catch.hpp>
+
+TEST_CASE("ARDUINOJSON_USE_LONG_LONG == 0") {
+  DynamicJsonDocument doc(4096);
+
+  doc["A"] = 42;
+  doc["B"] = 84;
+
+  std::string json;
+  serializeJson(doc, json);
+
+  REQUIRE(json == "{\"A\":42,\"B\":84}");
+}

extras/tests/MixedConfiguration/use_long_long_1.cpp

@@ -0,0 +1,17 @@
+#define ARDUINOJSON_USE_LONG_LONG 1
+#include <ArduinoJson.h>
+
+#include <catch.hpp>
+
+TEST_CASE("ARDUINOJSON_USE_LONG_LONG == 1") {
+  DynamicJsonDocument doc(4096);
+  JsonObject root = doc.to<JsonObject>();
+
+  root["A"] = 123456789123456789;
+  root["B"] = 987654321987654321;
+
+  std::string json;
+  serializeJson(doc, json);
+
+  REQUIRE(json == "{\"A\":123456789123456789,\"B\":987654321987654321}");
+}