final Assignment a = newAssignment("a", -1, 2);
final Assignment b = newAssignment("b", -1, 2);
final Assignment c = newAssignment("c", -1, 2);
ConflictMatrix conflictMatrix = new ConflictMatrix(slotsPerWeek, slotsPerDay);
conflictMatrix.initFromResources(newResources(Arrays.asList(a, b), Arrays.asList(a, c), Arrays.asList(b, c)));
List locations = Arrays.asList(new Location(5));
periode = newPeriod(slotsPerWeek, locations, conflictMatrix);
periode.setRandom(new Random());