More testing and updated CMake to allow calling private functions from the tests

CMakeLists.txt

@@ -4,6 +4,9 @@ project(json)
 # Enable C++11 and set flags for coverage testing
 SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -g -O0 --coverage -fprofile-arcs -ftest-coverage")
 
+# Make everything public for testing purposes
+add_definitions(-Dprivate=public)
+
 # If not specified, use Debug as build type (necessary for coverage testing)
 if( NOT CMAKE_BUILD_TYPE )
   set( CMAKE_BUILD_TYPE Debug CACHE STRING

test/json_unit.cc

@@ -1697,6 +1697,12 @@ TEST_CASE("Parser")
         CHECK_THROWS_AS(json::parse("\"\\uD80C\\uD80C\""), std::invalid_argument);
         CHECK_THROWS_AS(json::parse("\"\\uD80C\\u0000\""), std::invalid_argument);
         CHECK_THROWS_AS(json::parse("\"\\uD80C\\uFFFF\""), std::invalid_argument);
+
+        // test private code point converter function
+        CHECK_NOTHROW(json::parser("").codePointToUTF8(0x10FFFE));
+        CHECK_NOTHROW(json::parser("").codePointToUTF8(0x10FFFF));
+        CHECK_THROWS_AS(json::parser("").codePointToUTF8(0x110000), std::invalid_argument);
+        CHECK_THROWS_AS(json::parser("").codePointToUTF8(0x110001), std::invalid_argument);
     }
 
     SECTION("boolean")