I'm now working on an custom controller and vf pages that will override standard opportunity behaviours. So far is all good and we get expected results in sandbox with different user profiles. However when I wrote the test method for the controller and trying to run it, I got the following error:

Internal Salesforce Error: 694469977-8690 (1545795159) (1545795159) 

After my investigation, this error occurs when inserting an custom object instance in test method, and below is the code block cause the issue:

Scenario__c sc = new Scenario__c(Opportunity__c=opp.Id, Medical_Centre__c=pryAcc.Id, Contracted_Hours_per_Week__c=40,    
                                                    Contracted_Years__c=5, Evening_Hours_per_Week__c=5, Weekend_Hours_per_Week__c=6,                                                                         Working_Weekends_per_Year__c=40, Weeks_Not_Req_to_Work_per_Year__c='4 weeks', 
                                                    Has_VR_Status__c=true, Ack_Leave_Not_Carried_Over__c=true, Ack_Restricted_Internet_Access__c=true,
                                                    Ack_No_Appointment_Basis__c=true, Ack_No_STD_ISD_Mobile_Ph_Access__c=true,
                                                    Ack_Work_Equal_Share_of_Public_Holidays__c=true, Ack_Xmas_New_Year_Special_Roster__c=true,                                                             DWS_Position_Required__c='Yes', Selected_Price__c=true);
  
 insert sc;

(opp.Id & pryAcc.Id are previoused inserted account and opportunity id, which required in scenario calculator)

If I removed this piece of code, the test passed but will pull down the coverage% of the whole test. I have gone through some online comments but no final solution to this issue.

Any advices on that?



Thanks in advance.
Stanley