Test Apex Triggers

AccountDeletion.apxt

trigger AccountDeletion on Account (before delete) {
    // Prevent the deletion of accounts if they have related opportunities.
    for (Account a : [SELECT Id FROM Account
                      WHERE Id IN (SELECT AccountId FROM Opportunity) AND
                      Id IN :Trigger.old]) 
    {
        Trigger.oldMap.get(a.Id).addError( 'Cannot delete account with related opportunities.');
    }
    
}

TestAccountDeletion.apxc

@isTest
private class TestAccountDeletion {
    @isTest static void TestDeleteAccountWithOneOpportunity() {
        // Test data setup
        // Create an account with an opportunity, and then try to delete it
        Account acct = new Account(Name='Test Account');
        insert acct;
        Opportunity opp = new Opportunity(Name=acct.Name + ' Opportunity',
                                          StageName='Prospecting',
                                          CloseDate=System.today().addMonths(1),
                                          AccountId=acct.Id);
        insert opp;
        
        // Perform test
        Test.startTest();
        Database.DeleteResult result = Database.delete(acct, false);
        Test.stopTest();
        // Verify 
        // In this case the deletion should have been stopped by the trigger,
        // so verify that we got back an error.
        System.assert(!result.isSuccess());
        System.assert(result.getErrors().size() > 0);
        System.assertEquals('Cannot delete account with related opportunities.',
                            result.getErrors()[0].getMessage());
    }    
}

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測試數據是在測試方法內部設置的，隨着您添加更多測試方法，這可能會很耗時。

如果您有許多測試方法，請將創建測試數據放入測試實用程序類中，然後從多個測試方法中調用該實用程序類

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Create a unit test for a simple Apex trigger

RestrictContactByName.apxt

trigger RestrictContactByName on Contact (before insert, before update) {	
	//check contacts prior to insert or update for invalid data
	For (Contact c : Trigger.New) {
		if(c.LastName == 'INVALIDNAME') {	//invalidname is invalid
			c.AddError('The Last Name "'+c.LastName+'" is not allowed for DML');
		}
	}
}

TestRestrictContactByName.apxc

@isTest
private class TestRestrictContactByName {
    
    static testMethod void  metodoTest() 
    {        
        List<Contact> listContact= new List<Contact>();
        Contact c1 = new Contact(FirstName='Francesco', LastName='Riggio' , email='[email protected]');
        Contact c2 = new Contact(FirstName='Francesco1', LastName = 'INVALIDNAME',email='[email protected]');
        listContact.add(c1);
        listContact.add(c2);
        
        Test.startTest();
        try
        {
            insert listContact;
        }
        catch(Exception ee)
        {
        }
        
        Test.stopTest(); 
        
    }
    
}