old_contents: from ambulance.models import Call, Patient
  from ambulance.serializers import CallSerializer
  from emstrack.tests.util import date2iso, point2str, dict2point
  from django.test import Client
  from django.utils import timezone
  from django.conf import settings
  from rest_framework.parsers import JSONParser
  from io import BytesIO
  import json
  
  from login.tests.setup_data import TestSetup
  
  class TestCall(TestSetup):
  	def test_call_serializer(self):
  		c1 = Call.objects.create(number="123", street="dunno", updated_by=self.u1)
  
  		serializer = CallSerializer(c1)
  		result = {
  			'id': c1.id,
  			'numebr': c1.number,
  			'street': c1.street,
  			'active': c1.active,
  			'details': c1.details,
  			'priority': c1.priority,
  			'created_at': data2iso(serializer.call_ambulances.),
  			'ended_at': data2iso(serializer.call_ambulances.),
  			'comment': c1.comment,
  			'updated_by': c1.updated_by.id,
  			'updated_on': date2iso(c1.updated_on)
  		}
  		self.assertDictEqual(serializer.data, result)
  
new_contents: from ambulance.models import Call, Patient
  from ambulance.serializers import CallSerializer
  from emstrack.tests.util import date2iso, point2str, dict2point
  from django.test import Client
  from django.utils import timezone
  from django.conf import settings
  from rest_framework.parsers import JSONParser
  from io import BytesIO
  import json
  
  from login.tests.setup_data import TestSetup
  
  class TestCall(TestSetup):
      def test_call_serializer(self):
          c1 = Call.objects.create(number="123", street="dunno", updated_by=self.u1)
  
          serializer = CallSerializer(c1)
  	result = {
  	    'id': c1.id,
  	    'active': c1.active,
  	    'details': c1.details,
  	    'priority': c1.priority,
  	    'numebr': c1.number,
  	    'street': c1.street,
  	    'unit': c1.unit,
  	    'neighborhood': c1.neighborhood,
  	    'city': c1.city,
  	    'state': c1.state,
  	    'zipcode': c1.zipcode,
  	    'country': c1.country
  	    'location': c1.location
  	    'created_at': data2iso(c1.created_at),
  	    'ended_at': data2iso(c1.ended_at),
  	    'comment': c1.comment,
  	    'updated_by': c1.updated_by.id,
  	    'updated_on': date2iso(c1.updated_on)
  	}
  	self.assertDictEqual(serializer.data, result)
  
  class TestPatient(TestSetup):
      def test_parient_serializer(self):
  	p1 = Patient.objects.create(age="14")
  
  	serializer = PatientSerializer(p1)
  	result = {
  	    'id': p1.id,
              'name': p1.name,
  	    'age': p1.age
  	}
  	self.assertDictEqual(serializer.data, result)
  
subject: add TestAmbulanceCallTimeSerializer, update call Serializer