Fix the following usage of the at() function.

at(1.0, function() {});
at(1.0, function() {}); // Conflict

at(1.0, function() {}, "Check my feet");
at(1.0, function() {}, "Check my feet"); // Conflict!
at(1.0, function() {}, "Check my arms"); // Fine

at(2.0, function() {}, "Check my feet"); // Not conflict
Updating the auto-generated test cases to better utilise the at() desc argument.