Add dataTypeName tests for function_t and c_function_t

tests/test_ASTNodeDataType.cpp

@@ -14,6 +14,8 @@ TEST_CASE("ASTNodeDataType", "[language]")
     REQUIRE(dataTypeName(ASTNodeDataType::string_t) == "string");
     REQUIRE(dataTypeName(ASTNodeDataType::typename_t) == "typename");
     REQUIRE(dataTypeName(ASTNodeDataType::void_t) == "void");
+    REQUIRE(dataTypeName(ASTNodeDataType::function_t) == "function");
+    REQUIRE(dataTypeName(ASTNodeDataType::c_function_t) == "c_function");
   }
 
   SECTION("promotion")