Update cmake_install_test, cmake_subdir_test

test/cmake_subdir_test/main.cpp

@@ -0,0 +1,31 @@
+//  Copyright 2019, 2023 Peter Dimov
+//  Distributed under the Boost Software License, Version 1.0.
+//  http://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/endian/arithmetic.hpp>
+#include <cassert>
+
+#define BOOST_TEST_EQ(x, y) assert((x)==(y))
+
+int main()
+{
+    using namespace boost::endian;
+
+    {
+        little_uint32_t v( 0x01020304 );
+
+        BOOST_TEST_EQ( v.data()[ 0 ], 0x04 );
+        BOOST_TEST_EQ( v.data()[ 1 ], 0x03 );
+        BOOST_TEST_EQ( v.data()[ 2 ], 0x02 );
+        BOOST_TEST_EQ( v.data()[ 3 ], 0x01 );
+    }
+
+    {
+        big_uint32_t v( 0x01020304 );
+
+        BOOST_TEST_EQ( v.data()[ 0 ], 0x01 );
+        BOOST_TEST_EQ( v.data()[ 1 ], 0x02 );
+        BOOST_TEST_EQ( v.data()[ 2 ], 0x03 );
+        BOOST_TEST_EQ( v.data()[ 3 ], 0x04 );
+    }
+}