Tests are not passing

Some tests are not passing anymore:

  7) Tracking Parcel
       GET /tracking/{sessionId}/parcel/status/{status}
         Administrator lists the parcels by status  SCHEDULED:

      AssertionError: expected 500 to equal 200
      + expected - actual

      -500
      +200
      
      at Context.<anonymous> (test/routes/test.parcel.routes.js:66:56)
      at runMicrotasks (<anonymous>)
      at processTicksAndRejections (internal/process/task_queues.js:97:5)

  8) Tracking Parcel
       DELETE /tracking/:sessionId/investigation/id/:investigationId/parcel/id/:parcelId/item
         InvestigationUser removes an item from a parcel :

      AssertionError: expected 500 to equal 200
      + expected - actual

      -500
      +200
      
      at Context.<anonymous> (test/routes/test.parcel.routes.js:205:49)
      at runMicrotasks (<anonymous>)
      at processTicksAndRejections (internal/process/task_queues.js:97:5)

  9) Tracking Parcel
       DELETE /tracking/:sessionId/investigation/id/:investigationId/parcel/id/:parcelId/item
         InstrumentScientist removes an item from a parcel :

      AssertionError: expected 500 to equal 200
      + expected - actual

      -500
      +200
      
      at Context.<anonymous> (test/routes/test.parcel.routes.js:205:49)
      at runMicrotasks (<anonymous>)
      at processTicksAndRejections (internal/process/task_queues.js:97:5)

  10) Tracking Parcel
       DELETE /tracking/:sessionId/investigation/id/:investigationId/parcel/id/:parcelId/item
         Administrator removes an item from a parcel :

      AssertionError: expected 500 to equal 200
      + expected - actual

      -500
      +200

At least there is a least a serious problem here:

2020-08-23T11:02:01.680Z [error]: helper.findParcel is not a function TypeError: helper.findParcel is not a function