add dated assignment endpoint

backend/tests/Fakes/FakeScheduleRepository.php

@@ -3,10 +3,12 @@
 namespace Tests\Fakes;
 
 use App\Schedule\CreateScheduleDto;
+use App\Schedule\AssignmentForDate;
 use App\Schedule\Schedule;
 use App\Schedule\ScheduleAssignment;
 use App\Schedule\ScheduleRepository;
 use App\User\User;
+use DateTimeImmutable;
 
 class FakeScheduleRepository implements ScheduleRepository
 {
@@ -72,6 +74,31 @@ class FakeScheduleRepository implements ScheduleRepository
         }, array_values($schedules));
     }
 
+    public function findAssignmentsForUserOnDate(
+        User $user,
+        DateTimeImmutable $date,
+    ): array {
+        $assignments = [];
+
+        foreach ($this->findAllForUser($user) as $schedule) {
+            foreach ($schedule->getAssignments() as $assignment) {
+                if ($assignment->getScheduledDate()->format('Y-m-d')
+                    !== $date->format('Y-m-d')
+                ) {
+                    continue;
+                }
+
+                $assignments[] = new AssignmentForDate(
+                    scheduleId: $schedule->getId(),
+                    setName: $schedule->getSetName(),
+                    assignment: $assignment,
+                );
+            }
+        }
+
+        return $assignments;
+    }
+
     private function copy(Schedule $schedule): Schedule
     {
         $assignments = array_map(