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Test Class Coverage For Trigger

Hi Friends,
I am new to the development, Could You Please Anyone cover a test class for below trigger.

-----------------------Code  ----------------------

trigger OI_AgentLogin_FIFOInit on Agent_Availability_Log__c(after Insert, after Update){
    // Active Complaint
    Boolean m_CNsetup = false;  

    // Get current profile custom setting.
    Trigger_Controller__c m_CNprofile = Trigger_Controller__c.getvalues(UserInfo.getProfileId()); 
    // Get current Organization custom setting.
    Trigger_Controller__c m_CNOrg = Trigger_Controller__c.getvalues(UserInfo.getOrganizationId());
    // Get current User custom setting.
    Trigger_Controller__c m_CNuser = Trigger_Controller__c.getValues(UserInfo.getUserId());

    if(m_CNuser != null) {
        m_CNsetup = m_CNuser.OI_AgentLogin_FIFOInit__c;
    else if(m_CNprofile != null) {
        m_CNsetup = m_CNprofile.OI_AgentLogin_FIFOInit__c;
    else if(m_CNOrg != null) {
        m_CNsetup = m_CNOrg.OI_AgentLogin_FIFOInit__c;

    set<string> st_MgrID = new set<string>(); // Set of Group Manager Id
    set<string> st_RTId = new set<string>(); // Set of Record Type Id
    map<string, list<case>> mp_CasLs2CasOrg = new map<string, list<case>>(); // Mapping List of Case to Case Origin
    Set<string> st_CasOrg = new Set<string>(); // Set of Case Origin
    for(Agent_Availability_Log__c irow :{
        If(trigger.isInsert && irow.Date__c == System.Today() && irow.IsAvailable__c && irow.Group_Member__r.FIFO_Case_Count__c == 0){
        if(trigger.isUpdate && irow.Date__c == System.Today() && irow.IsAvailable__c && irow.Group_Member__r.FIFO_Case_Count__c == 0){
        for(Schema.RecordTypeInfo irow : Schema.SObjectType.Case.getRecordTypeInfosByName().values()){
            if(irow.getName() == 'Parent' || irow.getName() == 'Child'){
        system.debug(' st_RTId ' + st_RTId);
        for(case irow : [Select Id, CaseNumber, Email__c, Origin, OwnerId, OwnerId__c, CreatedDate FROM Case WHERE OwnerId IN: st_MgrID AND IsFIFOAssigned_Agent__c = FALSE AND IsFIFOAssigned_Mgr__c = TRUE AND RecordTypeId IN: st_RTId]){
            AssignGroupName_ModeofAssignment__c Asg = AssignGroupName_ModeofAssignment__c.getvalues(irow.Origin);
            if(Asg.Mode_of_Assignment__c == 'FIFO' && !irow.IsFIFOAssigned_Agent__c && irow.IsFIFOAssigned_Mgr__c){
                    list<case> Tmp = mp_CasLs2CasOrg.get(irow.Origin);
                    mp_CasLs2CasOrg.put(irow.Origin, Tmp);
                    list<case> Tmp = new list<case>();
                    mp_CasLs2CasOrg.put(irow.Origin, Tmp);
        System.debug('st_CasOrg ## i'+st_CasOrg);
        system.debug(' mp_CasLs2CasOrg ### ' + mp_CasLs2CasOrg);
    if(St_CasOrg.size() > 0){
        // FIFO
        OI_FIFOAssignment fifo = new OI_FIFOAssignment(St_CasOrg, mp_CasLs2CasOrg);fifo.Assign();

Thanks In Advance

Soundar Raj.
Amit Chaudhary 8Amit Chaudhary 8
I will recommend you to start using trailhead to learn about test classes

Also please check below post

You write a test class for this the same way that you would any other:

- Set up some data for the Trigger to access (in this case it looks like Agent_Availability_Log__c object )
- Instantiate the Trigger- After insert or update Agent_Availability_Log__c record
- Execute a method/methods
- Verify the behaviour with asserts.

Please follow below salesforce Best Practice for Test Classes :-

1. Test class must start with @isTest annotation if class class version is more than 25
2. Test environment support @testVisible , @testSetUp as well
3. Unit test is to test particular piece of code working properly or not .
4. Unit test method takes no argument ,commit no data to database ,send no email ,flagged with testMethod keyword .
5. To deploy to production at-least 75% code coverage is required
6. System.debug statement are not counted as a part of apex code limit.
7. Test method and test classes are not counted as a part of code limit
9. We should not focus on the  percentage of code coverage ,we should make sure that every use case should covered including positive, negative,bulk and single record .
Single Action -To verify that the the single record produces the correct an expected result .
Bulk action -Any apex record trigger ,class or extension must be invoked for 1-200 records .
Positive behavior : Test every expected behavior occurs through every expected permutation , i,e user filled out every correctly data and not go past the limit .
Negative Testcase :-Not to add future date , Not to specify negative amount.
Restricted User :-Test whether a user with restricted access used in your code .
10. Test class should be annotated with @isTest .
11 . @isTest annotation with test method  is equivalent to testMethod keyword .
12. Test method should static and no void return type .
13. Test class and method default access is private ,no matter to add access specifier .
14. classes with @isTest annotation can't be a interface or enum .
15. Test method code can't be invoked by non test request .
16. Stating with salesforce API 28.0 test method can not reside inside non test classes .
17. @Testvisible annotation to make visible private methods inside test classes.
18. Test method can not be used to test web-service call out . Please use call out mock .
19. You can't  send email from test method.
20.User, profile, organization, AsyncApexjob, Corntrigger, RecordType, ApexClass, ApexComponent ,ApexPage we can access without (seeAllData=true) .
21. SeeAllData=true will not work for API 23 version eailer .
22. Accessing static resource test records in test class e,g List<Account> accList=Test.loadData(Account,SobjectType,'ResourceName').
23. Create TestFactory class with @isTest annotation to exclude from organization code size limit .
24. @testSetup to create test records once in a method  and use in every test method in the test class .
25. We can run unit test by using Salesforce Standard UI, IDE ,Console ,API.
26. Maximum number of test classes run per 24 hour of period is  not grater of 500 or 10 multiplication of test classes of your organization.
27. As apex runs in system mode so the permission and record sharing are not taken into account . So we need to use system.runAs to enforce record sharing .
28. System.runAs will not enforce user permission or field level permission .
29. Every test to runAs count against the total number of DML issued in the process .

Please let us know if this post will help you