Test class for community to get network id

Question

i am facing problem with getting network id in test class, while executing visual force page, controller returns proper network id, when try to write a test class for this 'ClassNetwork' controller, community network id always return null. Can anyone help me?

class ClassNetwork {
//some code
    public id fetchNetworkId() {
    system.debug('network id ' + Network.getNetworkId()); // network id is  null;
    return Network.getNetworkId(); // return null
    }
// some code
}


@isTest(SeeAllData=true)
public static void TestEmptySearchQuery() {    
    Test.startTest(); 
    User u=[select Id,name from user where name ='Alex']; 
    // Registered user from org, same user i login to org through visual force page its working fine. i get the network id in this case.
    System.runAs ( u ) {           
        system.debug('Network communityId ****' + Network.getNetworkId());  //display null 
        ClassNetwork obj = new ClassNetwork();
        Id Nid=obj.fetchNetworkId(); // return null;   
        system.debug('network id ' + Nid);  // Nid is null
    } 
    Test.stopTest();        
} 

Answer 1

When you create a community user, and the profile used in the community is assigned to the user — a Network Member object record is created in Salesforce.

Thus, if your Alex user has the profile that is related to the community, you can query the corresponding Network Member record filtered by MemberId field, which is the Id of the user, and you can access the NetworkId field from this query, which is the Id of your network.

Id networkId = [SELECT NetworkId FROM NetworkMember WHERE MemberId = :u.Id].NetworkId;