diff --git a/Atomic/Dropbox.test/0.cc b/Atomic/Dropbox.test/0.cc
new file mode 100644
index 0000000..284010f
--- /dev/null
+++ b/Atomic/Dropbox.test/0.cc
@@ -0,0 +1,45 @@
+static_assert( __cplusplus > 2023'00 );
+
+#include "../Dropbox.h"
+
+#include <Alepha/Testing/TableTest.h>
+#include <Alepha/Testing/test.h>
+
+#include <Alepha/Utility/enroll.h>
+#include <Alepha/Utility/evaluate.h>
+
+static auto init= Alepha::Utility::enroll <=[]
+{
+	using namespace Alepha::Testing::exports;
+	using namespace Alepha::Testing::literals;
+	using namespace Alepha::Utility::exports::evaluate_m;
+
+	const std::string tooLong= "Supercalifragalisticexpialidocious and "
+							"Antidisestablishmentarianism";
+
+	"Does weight computation make sense for strings?"_test <=TableTest
+	<
+		[]( const std::string &init, const std::size_t sz )
+		{
+			std::string s= init;
+			if( sz ) s.reserve( sz );
+			return Alepha::Atomic::Dropbox_m::computeWeight( s );
+		}
+	>
+	::Cases
+	{
+		{ "Empty string, SSO", { "", 0 }, sizeof( std::string ) },
+		{ "Empty string, no SSO", { "", 1000 }, sizeof( std::string ) + 1000 },
+
+		{ "'Hello', SSO", { "Hello", 0 }, sizeof( std::string ) },
+		{ "'Hello', no SSO", { "Hello", 1000 }, sizeof( std::string ) + 1000 },
+
+
+		// This pair of cases are extremely sensitive to SSO implementation.
+		// If the SSO supports at least 16 bytes (including Null), then these pass.
+		{ "Hex digits, except for F, SSO", { "0123456789ABCDE", 0 }, sizeof( std::string ) },
+		{ "Hex digits, except for F, SSO", { "0123456789ABCDE", 1000 }, sizeof( std::string ) + 1000 },
+
+		{ "Too long", { tooLong, 0 }, sizeof( std::string ) + tooLong.capacity() },
+	};
+};
diff --git a/Atomic/Dropbox.test/CMakeLists.txt b/Atomic/Dropbox.test/CMakeLists.txt
new file mode 100644
index 0000000..b099603
--- /dev/null
+++ b/Atomic/Dropbox.test/CMakeLists.txt
@@ -0,0 +1 @@
+unit_test( 0 )