Do compile time checks in compile time instead of tests

apps/openmw_test_suite/esm/test_fixed_string.cpp

@@ -87,20 +87,6 @@ TEST(EsmFixedString, empty_strings)
     }
 }
 
-TEST(EsmFixedString, struct_size)
-{
-    ASSERT_EQ(4, sizeof(ESM::NAME));
-    ASSERT_EQ(32, sizeof(ESM::NAME32));
-    ASSERT_EQ(64, sizeof(ESM::NAME64));
-}
-
-TEST(EsmFixedString, is_pod)
-{
-     ASSERT_TRUE(std::is_standard_layout_v<ESM::NAME> && std::is_trivial_v<ESM::NAME>);
-     ASSERT_TRUE(std::is_standard_layout_v<ESM::NAME32> && std::is_trivial_v<ESM::NAME32>);
-     ASSERT_TRUE(std::is_standard_layout_v<ESM::NAME64> && std::is_trivial_v<ESM::NAME64>);
-}
-
 TEST(EsmFixedString, assign_should_zero_untouched_bytes_for_4)
 {
     ESM::NAME value;

components/esm/esmcommon.hpp

@@ -8,6 +8,7 @@
 #include <cstdint>
 #include <cassert>
 #include <limits>
+#include <type_traits>
 
 namespace ESM
 {
@@ -171,6 +172,14 @@ using NAME = FixedString<4>;
 using NAME32 = FixedString<32>;
 using NAME64 = FixedString<64>;
 
+static_assert(std::is_standard_layout_v<NAME> && std::is_trivial_v<NAME>);
+static_assert(std::is_standard_layout_v<NAME32> && std::is_trivial_v<NAME32>);
+static_assert(std::is_standard_layout_v<NAME64> && std::is_trivial_v<NAME64>);
+
+static_assert(sizeof(NAME) == 4);
+static_assert(sizeof(NAME32) == 32);
+static_assert(sizeof(NAME64) == 64);
+
 /* This struct defines a file 'context' which can be saved and later
    restored by an ESMReader instance. It will save the position within
    a file, and when restored will let you read from that position as