Revert "Revert "TST: update tests""

This reverts commit 27373949.

test/test_connection.cpp

@@ -84,7 +84,7 @@ TEST(test_connection, connection_ssl_authentication_error_anonymous) {
   EXPECT_THROW_MESSAGE(connection.RetrieveVersionInfo(), AuthenticationError,
                        "The attempt to execute this transaction has not been "
                        "executed at all because the authentication did not "
-                       "succeed. Original error: Please login.");
+                       "succeed. Original error: Please log in!");
 }
 
 TEST(test_connection, connection_ssl_authentication_error_wrong_credentials) {