Add self-tests to the encryption providers.

modules/encryption/enc_md5.cpp

@@ -54,6 +54,11 @@ public:
 	{
 		if (ModuleManager::FindFirstOf(ENCRYPTION) == this)
 			throw ModuleException("enc_md5 is deprecated and can not be used as a primary encryption method");
+
+		md5provider.Check({
+			{ "d41d8cd98f00b204e9800998ecf8427e", "" },
+			{ "9e107d9d372bb6826bd81d3542a419d6", "The quick brown fox jumps over the lazy dog" },
+		});
 	}
 
 	EventReturn OnEncrypt(const Anope::string &src, Anope::string &dest) override