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Send Now Active Hierarchy Filter Tests
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1. Testing ScheduleRepository::findByStudyId() filters by status
✅ Test 1: ScheduleRepository::findByStudyId() includes 'WHERE study_id = ? AND status = 1'
✅ Test 2: ScheduleRepository::findByStudyId() docblock mentions 'active schedules'

2. Testing NotificationRepository::findByScheduleId() filters by status
✅ Test 3: NotificationRepository::findByScheduleId() includes 'WHERE n.schedule_id = ? AND n.status = 1'
✅ Test 4: NotificationRepository::findByScheduleId() docblock mentions 'active/pending notifications'
✅ Test 5: Status filter is in WHERE clause of findByScheduleId()

3. Testing StudiesController updates
✅ Test 6: Controller uses 'No active schedule found' error message
✅ Test 7: Controller uses 'No active notification found' error message
✅ Test 8: Controller logs 'active schedule' when found
✅ Test 9: Controller logs 'No active notification found' when missing

4. Testing query patterns for consistency
✅ Test 10: ScheduleRepository::find() does NOT filter by status (correct - find by ID should return any status)
✅ Test 11: NotificationRepository::find() does NOT filter by status (correct - find by ID should return any status)

5. Testing database behavior with real repositories
⚠️  Database not found, skipping database tests

6. Testing for regressions in other methods
✅ Test 12: ScheduleRepository::findAllByStudyId() exists and does not filter by status
✅ Test 13: NotificationRepository::findAllByScheduleId() exists and does not filter by status

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Test Results: 13/13 passed
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✅ All tests passed! Send Now button now correctly filters active hierarchy.

Expected behavior:
  - Study 126 (active) → Schedule 230 (active) → Notification 1534 (active)
  - Will NOT find: Schedule 229 (inactive) or Notification 1531 (inactive)