1. A computer-implemented method, the method performed by a processor, the method comprising: obtaining a partial coverage task defining a test with respect to a functional coverage model of a System Under Test (SUT), wherein the functional coverage model defining functional attributes and respective domains thereof, wherein the functional coverage model further defining one or more restrictions on value combinations of the functional attributes; and enhancing the partial coverage task to include an assignment of a value to a functional attribute, wherein the functional attribute is unassigned in the partial coverage task, wherein the value is an only valid assignment to the functional attribute in view of assignments of other functional attributes and in view of the restrictions.