diff --git a/scripts/test.sh b/scripts/test.sh
index 0088c60..56a7c1c 100755
--- a/scripts/test.sh
+++ b/scripts/test.sh
@@ -38,6 +38,7 @@ COMPILE_COMMANDS=(
     "$CXX_WITH_FLAGS src/test/javacompat.cpp -I./include -Lbin/lib -l:javacompat.so -o bin/test/javacompat"
     "$CXX_WITH_FLAGS src/test/nbt_write_string_failure_mode.cpp -I./include -Lbin/lib -l:nbt.so -l:javacompat.so -o bin/test/nbt_write_string_failure_mode"
     "$CXX_WITH_FLAGS src/test/nbt_tags.cpp -I./include -Lbin/lib -l:nbt.so -l:javacompat.so -o bin/test/nbt_tags"
+    "$CXX_WITH_FLAGS src/test/nbt_size_helpers.cpp -I./include -Lbin/lib -l:nbt.so -l:javacompat.so -o bin/test/nbt_size_helpers"
 )
 for command in ${!COMPILE_COMMANDS[@]}; do
     echo "${COMPILE_COMMANDS[command]}"
diff --git a/src/test/nbt_read_write_helpers.cpp b/src/test/nbt_read_write_helpers.cpp
index d01d91b..cd08330 100644
--- a/src/test/nbt_read_write_helpers.cpp
+++ b/src/test/nbt_read_write_helpers.cpp
@@ -26,7 +26,7 @@
 
 int main(){
     std::cout << "################################################################################" << std::endl;
-    std::cout << "NBT helper tests" << std::endl;
+    std::cout << "NBT read/write helper tests" << std::endl;
     std::cout << "################################################################################" << std::endl;
 
     // used for all integer tests
diff --git a/src/test/nbt_size_helpers.cpp b/src/test/nbt_size_helpers.cpp
new file mode 100644
index 0000000..01a8fea
--- /dev/null
+++ b/src/test/nbt_size_helpers.cpp
@@ -0,0 +1,62 @@
+// Copyright 2022, FOSS-VG Developers and Contributers
+//
+// This program is free software: you can redistribute it and/or modify it
+// under the terms of the GNU Affero General Public License as published
+// by the Free Software Foundation, version 3.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied
+// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+// See the GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// version 3 along with this program.
+// If not, see https://www.gnu.org/licenses/agpl-3.0.en.html
+
+#include <iostream>
+#include <cstdint>
+
+#include "assert.hpp"
+
+#include "../lib/nbt.hpp"
+#include "../lib/error.hpp"
+
+int main() {
+    std::cout
+        << "################################################################################\n"
+        << "NBT size helper tests\n"
+        << "################################################################################"
+        << std::endl;
+
+    // end tag #########################################################
+    // const uint8_t END        =  0;
+    uint8_t endTestData[] = {
+      0x00, 0x0a, 0x00, 0x11, 0x63, 0x6f, 0x6d, 0x70,
+      0x6f, 0x75, 0x6e, 0x64, 0x5f, 0x6c, 0x65, 0x76,
+      0x65, 0x6c, 0x5f, 0x32, 0x62, 0x05, 0x00, 0x03,
+      0x33, 0x30, 0x30, 0x6e, 0x75, 0x6f, 0x70, 0x09,
+      0x00, 0x03
+    };
+    ErrorOr<uint64_t> totalSize = NBT::helper::nextTagTotalSize(endTestData, 34, 0);
+    ErrorOr<int32_t> dataLength = NBT::helper::nextTagDataLength(endTestData, 34, 0);
+
+    ASSERT(!totalSize.isError);
+    ASSERT(totalSize.value == 1);
+    ASSERT(!dataLength.isError);
+    ASSERT(dataLength.value == 0);
+
+    //const uint8_t INT8       =  1;
+    //const uint8_t INT16      =  2;
+    //const uint8_t INT32      =  3;
+    //const uint8_t INT64      =  4;
+    //const uint8_t FLOAT      =  5;
+    //const uint8_t DOUBLE     =  6;
+    //const uint8_t INT8_ARRAY =  7;
+    //const uint8_t STRING     =  8;
+    //const uint8_t LIST       =  9;
+    //const uint8_t COMPOUND   = 10;
+    //const uint8_t INT32_ARRAY= 11;
+    //const uint8_t INT64_ARRAY= 12;
+
+    return 0;
+}