@isTest static void test_AssignedResource_Insert() {
		List<AssignedResource> toInsert = new List<AssignedResource>();

		//retrieve a service resource
		List<ServiceResource> listSR = new List<ServiceResource>([SELECT Id, Name FROM ServiceResource WHERE Name = 'Technician One']);
		ServiceResource sr1 = listSR[0];

		// retrieve the Service Appointment created by test data
		List<WorkOrder> workOrders = new List<WorkOrder>([SELECT Id FROM WorkOrder WHERE Subject ='Test Subject1']);
		List<Id> woIds = new List<Id>();
		for (WorkOrder wo : workOrders ) {
			woIds.add(wo.Id);
		}
		if (woIds.size() > 0 ) {
			List<ServiceAppointment> appts = new List<ServiceAppointment> ();
			appts = [SELECT Id FROM ServiceAppointment WHERE Work_Order__c IN :woIds];
			//for all the appts - should be one - create an assigned resource
			if(appts.size()>0) {
				for( ServiceAppointment sa : appts ) {
					sa.SchedStartTime = datetime.newInstance(2019, 4, 19, 11, 00, 0);
					sa.SchedEndTime = datetime.newInstance(2019, 4, 19, 11, 30, 0);

					AssignedResource ar = new AssignedResource(ServiceAppointmentId=sa.Id,ServiceResourceId=sr1.Id);
					toInsert.add(ar);
				}
				update appts;

				insert toInsert;

				List<ServiceAppointment> assignedSA = new List<ServiceAppointment>([SELECT Id,Technician_Name__c FROM ServiceAppointment WHERE Work_Order__c IN :woIds]);
				System.assertEquals(assignedSA.size(), 1);
				System.assertEquals(assignedSA[0].Technician_Name__c,sr1.Name);

			} else {

			}


		} else {
			//exception
			System.assertNotEquals(woIds.size(), 0);
		}


	}

insert toInsert;

sa.SchedStartTime = datetime.newInstance(2019, 4, 19, 11, 00, 0);
sa.SchedEndTime = datetime.newInstance(2019, 4, 19, 11, 30, 0);
sa.Status = 'Scheduled';

update appts;