help with apex Test Class

Question

Can you please help me to write a test class for the blow code:

public class retrieveOpenSafetyObservations    {      
   private ApexPages.StandardSetController controller;      
   public List<Safety_Observation__c> getOutbaseSafetyObservations()                      {                                    
 return [SELECT Id, Name, Title__c, Priority__c,   Risk_Factor_Ranking__c,Contractor__c,Status__c          
    FROM Safety_Observation__c WHERE Status__c = 'Open' order by id desc limit 10];      
 }}

here is what I have so far:

 @isTest
        public class testRetrieveOpenSafetyObservation{
            static testMethod void testOpenSafetyOb(){
                    retrieveOpenSafetyObservations oso = new retrieveOpenSafetyObservations(
                      Safety_Observation__c SafObse = new Safety_Observation__c(
                      Basic_Risk_Factors__c ='Design',
                      Cause_Category__c = '1 Equipment and Material problems',
                      Cause_Code_Sub_Category__c = '3E other Human Error not specified here',
                      Contractor__c = 'a0fg0000000u09l',
                      Contributing_Factors__c = 'qwert',
                      Customer_Name__c = '001g0000007q9Z9',
                      Description__c  = 'bla bla',
                      Human_Factor_Domain__c = 'Staffing Issue (Workload etc.)',
                      Human_Factors__c = 'Alarms',
                      Performance_Improvment_Factors__c = 'Organisational Change',
                      Priority__c =  'Low',
                      Risk_Factor_Ranking__c = '2',
                      SO_Number_Name__c = 'Test',
                      Status__c = 'Open',
                      Title__c = 'Test'
                      );  
             insert SafObse ; );                  
                }   


         }

Answer 1

In your test, you are trying to use retrieveOpenSafetyObservations like a sObject, and are passing named parameters to it. You cannot do that with a method.

Create and insert SafObse before passing it as a parameter to your function, assuming your class even has an constructor.