Automated tests are scheduled for a telecommunication network. A time slot array is created and a subset of the time slots are marked as unavailable according to respective maintenance windows. A remainder of the time slots are marked as available. Trunk groups are sequentially selected for respectively scheduling the tests. A particular available time slot is identified in the array for both of the testing units corresponding to the respective trunk group. The slot is marked as unavailable and then each trunk circuit is sequentially selected within the respective trunk group. A respective test is designated for a selected trunk circuit during the particular time slot and a counter is incremented. A check is made whether the counter indicates that a number of the tests have been scheduled that fills a capacity of the testing units for running simultaneous tests. If the capacity is not filled, then the method repeats the designating step for a next selected trunk circuit using the particular time slot. Otherwise, a further time slot marked as available in the array for both of the testing units is found, the further time slot is marked as unavailable, and the designating step is repeated for a next selected trunk circuit using the further time slot.