diff --git a/test/unit_test/static/test_tools.h b/test/unit_test/static/test_tools.h
index a22f0891..42cbc61e 100644
--- a/test/unit_test/static/test_tools.h
+++ b/test/unit_test/static/test_tools.h
@@ -22,118 +22,9 @@
 
 #pragma once
 
-#include <cassert>
-#include <concepts>
+#include <mp-units/quantity_spec.h>
 #include <type_traits>
 
-// template<typename T, typename U>
-// inline constexpr bool compare_impl = false;
-
-// template<typename T>
-// inline constexpr bool compare_impl<T, T> = true;
-
-// template<typename T, typename U>
-//   requires(UNITS_DOWNCAST_MODE == 0)
-// inline constexpr bool compare_impl<T, U> = units::equivalent<T, U>;
-
-// template<typename T, typename U>
-// inline constexpr bool compare = compare_impl<std::remove_cvref_t<T>, std::remove_cvref_t<U>>;
-
-// template<typename T, typename... Us, typename... Vs>
-// constexpr bool constructible_from(Vs...)
-// {
-//   return std::constructible_from<T, Us..., Vs...>;
-// }
-
-// template<class T>
-// void convertible_from__(T);
-
-// template<typename T, typename... Us>
-// concept convertible_from_ = requires(Us... us) { convertible_from__<T>({us...}); };
-
-// template<typename T, typename... Us, typename... Vs>
-// constexpr bool convertible_from(Vs...)
-// {
-//   if constexpr (sizeof...(Us) + sizeof...(Vs) == 1)
-//     return std::is_convertible_v<Us..., Vs..., T>;
-//   else
-//     return convertible_from_<T, Us..., Vs...>;
-// }
-
-// template<typename T, typename... Us, typename... Vs>
-// constexpr bool constructible_or_convertible_from(Vs...)
-// {
-//   return constructible_from<T, Us..., Vs...>() || convertible_from<T, Us..., Vs...>();
-// }
-
-// template<typename T, typename... Us, typename... Vs>
-// constexpr bool constructible_and_convertible_from(Vs...)
-// {
-//   return constructible_from<T, Us..., Vs...>() && convertible_from<T, Us..., Vs...>();
-// }
-
-// template<typename T, typename... Us>
-//   requires(constructible_from<T, Us...>())
-// constexpr T construct_from(Us... us)
-// {
-//   return T(us...);
-// }
-
-// template<typename T, typename... Us>
-//   requires(convertible_from<T, Us...>())
-// constexpr T convert_from(Us... us)
-// {
-//   if constexpr (sizeof...(Us) == 1)
-//     return [](T t) { return t; }(us...);
-//   else
-//     return {us...};
-// }
-
-// template<std::equality_comparable T, typename... Us>
-//   requires(constructible_from<T, Us...>() && convertible_from<T, Us...>())
-// constexpr T construct_and_convert_from(Us... us)
-// {
-//   T t{construct_from<T>(us...)};
-//   assert(t == convert_from<T>(us...));
-//   return t;
-// }
-
-// template<typename T, typename... Us>
-//   requires(constructible_from<T, Us...>() && !convertible_from<T, Us...>())
-// constexpr T construct_from_only(Us... us)
-// {
-//   return construct_from<T>(us...);
-// }
-
-// #if !defined(UNITS_COMP_GCC)
-// template<template<typename...> typename T, typename = std::void_t<>, typename... Us>
-// concept ctad_constructible_from_ = requires(Us... us) { T(us...); };
-// #else
-// template<template<typename...> typename T, typename = std::void_t<>, typename... Us>
-// inline constexpr bool ctad_constructible_from_ = false;
-
-// template<template<typename...> typename T, typename... Us>
-// inline constexpr bool ctad_constructible_from_<T, std::void_t<decltype(T(Us{}...))>, Us...> = true;
-// #endif
-
-// template<template<typename...> typename T, typename... Us, typename... Vs>
-// constexpr bool ctad_constructible_from(Vs...)
-// {
-//   return ctad_constructible_from_<T, void, Us..., Vs...>;
-// }
-
-// constexpr auto same = []<std::equality_comparable T>(T l, T r) { return l == r; };
-// constexpr auto comp =  // TODO: Fix #205 to use `std::equality_comparable_with<T> U`.
-//   []<typename T, typename U>(T l, U r)
-//   requires compare<T, U>
-// {
-//   return l == r;
-// };
-
-// template<auto F>
-//   requires requires { F(); }
-// inline constexpr bool require_constant_invocation = requires { new int[1][(F(), 1)]; };
-
 template<auto V, typename T>
 inline constexpr bool is_of_type = std::is_same_v<std::remove_cvref_t<decltype(V)>, T>;