How to get the code coverage catch block in test class?

Question

I'm unable to cover the code coverage for catch block.Kindly help me to cover that code lines as well.Apex Class:public without sharing class ZTS_EU_Contact_populateCallDates{ Map mapConIdDate = new Map(); Map > mapCallAttendees = new Map>(); Map mapAttcon = new Map(); List listCon = new List(); LIst listAttendee = new List(); List listAllAttendee = new List(); public void getLastCallDate(List triggerNew){ for(CAll__C oCall: [SELECT id FROM CAll__C WHERE ID IN :TriggerNew]) { mapCallAttendees.put(oCall.id,null); } for(Attendee__C oAtt : [SELECT ZTS_EU_call__C, id ,ZTS_EU_Contact__C FROM Attendee__C WHERE ZTS_EU_call__c in :TriggerNew]) { listAttendee.add(oAtt); System.debug('OATT:;;;;'+oAtt); List newList = mapCallAttendees.get(oAtt.ZTS_EU_call__c); if(newList == null) newList = new List(); newList.add(oAtt); mapCallAttendees.put(oAtt.ZTS_EU_call__C, newList); mapAttCon.put(oAtt.id, oAtt.ZTS_EU_Contact__C ); } System.debug('listAttendee:;;;;'+listAttendee); if(listAttendee.size() >0){ system.debug('mapCallAttendees ::::'+ mapCallAttendees.size()); listAttendee = [SELECT ZTS_EU_Contact__c FROM Attendee__C WHERE ZTS_EU_Call__c IN :mapCallAttendees.keyset()]; LIst listConID = new List(); for(Attendee__c oAtt: listAttendee) { listConID.add(OAtt.ZTS_EU_Contact__c); } listAllAttendee = [SELECT id,ZTS_EU_Contact__c from Attendee__C where ZTS_EU_Contact__c IN : listConID]; List listAttID = new List(); for(Attendee__C oAtt1: listAllAttendee) { listAttID.add(oAtt1.id); mapAttCon.put(oAtt1.id, oAtt1.ZTS_EU_Contact__C ); } system.debug('mapAttCon ::::'+ mapAttCon.size()); //Updated Query to filter only Submitted & Planned Calls - NoorbashaSheik Chanbasha - 11/18/2021 - [SC-008964] List results = [SELECT ZTS_EU_Contact__c con,Max(ZTS_EU_call__r.ZTS_EU_Start_Date_Time__c) date from Attendee__c WHERE ID IN: listAttID AND (ZTS_EU_call__r.ZTS_EU_Status__c= 'Submitted' OR ZTS_EU_call__r.ZTS_EU_Status__c='Completed') Group BY ZTS_EU_Contact__c]; for(AggregateResult ar: results) { mapConIdDate.put(String.valueOf(ar.get('con')), Date.valueOF(ar.get('date'))); } for(Call__c oCall: triggerNew) { for(Attendee__c oAtt : mapCallAttendees.get(oCall.id)) { Contact oCon = new Contact(); oCon.id = mapAttcon.get(oAtt.id); system.debug('Before assigning call :::'+ oCall.ZTS_EU_Start_Date_Time__c); system.debug('Before assigning :::'+ mapConIdDate.get(oCon.id)); if(oCall.ZTS_EU_Start_Date_Time__c > mapConIdDate.get(oCon.id)) { system.debug('Before assigning :::'+ mapConIdDate.get(oCon.id)); system.debug('call start date :::'+ oCall.ZTS_EU_Start_Date_Time__c); mapConIdDate.put(oCon.ID, Date.valueOf(oCall.ZTS_EU_Start_Date_Time__c)); system.debug('After assigning :::'+ mapConIdDate.get(oCon.id)); } } } for(ID conId : mapConIdDate.keyset()) { system.debug('conId :::'+ conId); Contact oCon = new Contact(id = conId ); system.debug('final date :::'+ mapConIDDate.get(conId )); oCon.ZTS_EU_Last_call_Date__c = mapConIDDate.get(conId ); system.debug('Print Last date :::'+ oCon.ZTS_EU_Last_call_Date__c); listCon.add(oCon); } try { update(listCon); } catch(DmlException dex) { String errorMessages = ''; for (Integer i = 0; i < dex> System.debug('ZTS_EU_Contact_populateCallDates.getLastCallDate '); System.debug('DML Message: ' + dex.getDmlMessage(i)); errorMessages += dex.getDmlMessage(i) + '
'; } errorMessages.removeEnd('
'); ZTS_EU_Logger.notify = true; ZTS_EU_Logger.error(errorMessages,null, 'ZTS_EU_Contact_populateCallDates.getLastCallDate Contact DML error'); } } }}Test Class :@isTestpublic class ZTS_EU_Contact_populateCallDatesTest { static testMethod void validate_ZTS_EU_Contact_populateCallDates() { ZTS_DataUtilityTest.createPrimaryContactInactiveProfileCustomSetting(); User usr = new User(); usr = ZTS_EU_DataUtilityTest.createUserWithProfile('System Administrator', false); usr.FirstName = 'davidsUser'; usr.zts_eu_market__c = 'United Kingdom'; insert usr; System.runAs(usr) { Map mapConIdDate = new Map(); Map > mapCallAttendees = new Map>(); Map mapAttcon = new M…

David Edwards · Accepted Answer

We can use validation rules here to get the code coverage caught in test class. Check Contact validation rules which can fire at contact update. Create contact with those values which will be used to fire validation rules. So you can get DML exceptions here.

if you don't have any validation rules to fire at Contact update. try to move these exception block codes to separate methods in the class and use it in the test class. I know it is not a good practice but this is the way to get good test class coverage.

try{
// use any DML and it should fail here
}catch(DMLException ex) {
 // call the new method which will have an exception code.

Surijulia · Answer

If your test class is not covering the catch block, the most common reason is that the test Sprunki data and conditions are not triggering the exception that the code is designed to handle. To achieve coverage, you need to create a test scenario that intentionally causes the try block to fail, forcing execution into the catch block.

Ranjana Admin · Answer

To achieve code coverage for a catch block in a test class, you'll need to simulate the exception that the catch block is meant to handle. Here's a general approach:

Identify the Catch Block: Understand which catch block in your code you want to ensure is covered by your tests.

Create a Test Case: Write a test case that forces the code inside the try block to throw the exception that the catch block handles. You can do this by manipulating the inputs or the environment in such a way that the exception occurs.

Invoke the Method: Call the method under test within your test case.

Assert the Expected Behavior: After invoking the method, verify that the behavior in the catch block is as expected. This could involve checking variables, calling other methods, or inspecting the state of objects.

Check Code Coverage: Once you've run your tests, check the code coverage report to ensure that the catch block is being exercised.

Here's an example in pseudo-code to illustrate:

// Class under test
public class MyClass {
    public void myMethod() {
        try {
            // Some code that may throw an exception
        } catch (MyException e) {
            // Handle the exception
            System.out.println("Caught an exception: " + e.getMessage());
        }
    }
}


// Test class
public class MyClassTest {
    @Test
    public void testMyMethodWithException() {
        // Arrange
        MyClass myClass = new MyClass();
        // Act & Assert
        // You need to set up conditions that cause the exception to be thrown
        // For example, manipulating input or mock dependencies to throw the exception
        // Then call the method under test
        myClass.myMethod();
        // Add assertions here to verify the behavior after the exception is caught
        // For example, checking log messages, or verifying side effects
        // Assert.assertTrue(condition);
    }
}

In this example, you would replace the comments with actual code relevant to your application and test cases. The key is to set up your test environment so that the code inside the catch block is executed, and then verify its behavior.

How to get the code coverage catch block in test class?

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