diff --git a/include/sparrow/data_type.hpp b/include/sparrow/data_type.hpp
index b1676cf3..01da569f 100644
--- a/include/sparrow/data_type.hpp
+++ b/include/sparrow/data_type.hpp
@@ -49,6 +49,7 @@ namespace sparrow
     static_assert(std::is_floating_point_v<float16_t>);
     static_assert(std::is_floating_point_v<float32_t>);
     static_assert(std::is_floating_point_v<float64_t>);
+    static_assert(CHAR_BIT == 8);
 
 
     /// Runtime identifier of arrow data types, usually associated with raw bytes with the associated value.
diff --git a/test/test_mpl.cpp b/test/test_mpl.cpp
index e249f7c3..de470938 100644
--- a/test/test_mpl.cpp
+++ b/test/test_mpl.cpp
@@ -45,6 +45,11 @@ namespace sparrow
     static_assert(mpl::all_of<std::is_integral>(test_list{}));
     static_assert(not mpl::all_of<std::is_floating_point>(test_list{}));
 
+    static constexpr auto some_types = mpl::typelist<int, float>{};
+    static constexpr auto same_as_int = mpl::predicate::same_as<int>{};
+    static_assert( mpl::any_of(some_types, same_as_int) == true);
+    static_assert(mpl::all_of(some_types, same_as_int) == false);
+
 
     static_assert(mpl::find_if(test_list{}, mpl::predicate::same_as<int>{}) == 0);
     static_assert(mpl::find_if(test_list{}, mpl::predicate::same_as<char>{}) == 1);
diff --git a/test/test_traits.cpp b/test/test_traits.cpp
index 08b3ec06..84110cf5 100644
--- a/test/test_traits.cpp
+++ b/test/test_traits.cpp
@@ -1,3 +1,16 @@
+// Copyright 2024 Man Group Operations Limited
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
 
 #include <sparrow/data_traits.hpp>