Account a = new Account(Name='Test Account Name');
  insert a;

  Contact c = new Contact(LastName = 'Contact Last Name', AccountId = a.id);
  insert c;

  User user = new User();
  user.ProfileID = [Select Id From Profile Where Name='CustomerCommunity User Profile'].id;
  user.EmailEncodingKey = 'ISO-8859-1';
  user.LanguageLocaleKey = 'en_US';
  user.TimeZoneSidKey = 'America/New_York';
  user.LocaleSidKey = 'en_US';
  user.FirstName = 'first';
  user.LastName = 'last';
  user.Username = 'test@appirio.com';
  user.CommunityNickname = 'testUser123';
  user.Alias = 't1';
  user.Email = 'no@email.com';
  user.IsActive = true;
  user.ContactId = c.Id;

  insert user;

  System.RunAs(user) {
    // do all of my tests as
  }

public void getContactDetails(){

      conList = [SELECT Name,FirstName,LastName,Account.Name, Title, email,Phone,Contact_Type__c,AccountId
                  FROM Contact where AccountID=:currentUser[0].AccountId];

   }


  public void getAccountDetails(){
    accList = [SELECT id, name, BillingStreet, BillingCity, BillingState, BillingPostalCode,
   website,phone  FROM Account where id=: currentUser[0].AccountId];
    }

@isTest
public class CommunityUser_Test
{
    /*
    * This method prepares the test data of this class.
    */
    @testSetup static void prepareSetupData()
    {
          Account a = new Account(Name='Test Account Name');
          insert a;

          Contact c = new Contact(LastName = 'Contact Last Name', AccountId = a.id);
          insert c;

          User user = new User();
          user.ProfileID = [Select Id From Profile Where Name='Customer Community User'].id;
          user.EmailEncodingKey = 'ISO-8859-1';
          user.LanguageLocaleKey = 'en_US';
          user.TimeZoneSidKey = 'America/New_York';
          user.LocaleSidKey = 'en_US';
          user.FirstName = 'first';
          user.LastName = 'last';
          user.Username = 'test@appirio2.com';
          user.CommunityNickname = 'testUser123';
          user.Alias = 't1';
          user.Email = 'no@email.com';
          user.IsActive = true;
          user.ContactId = c.Id;
          insert user;
    }


     static testMethod void testforActualScenarios()
    {
        User userObj = [SELECT Id,ContactId, AccountId FROM User WHERE Username='test@appirio2.com'];
        System.RunAs(userObj) {
            //retrieve the contact.
            Contact contactObj = [SELECT Name,FirstName,LastName,Account.Name, Title, email,Phone,AccountId
                  FROM Contact where Id=: userObj.ContactId];

            System.assertEquals(contactObj.LastName,'Contact Last Name');


            List<Contact> conList = [SELECT Name,FirstName,LastName,Account.Name, Title, email,Phone,AccountId
                  FROM Contact where AccountID=:userObj.AccountId];

            System.assertEquals(conList[0].LastName,'Contact Last Name');

            //retrieve the account
             Account acct = [SELECT Id, Name FROM Account WHERE Id=:userObj.AccountId];
            System.assertEquals(acct.Name,'Test Account Name');

        }

    }
}

@isTest
public class CommunityUser_Test
{
    /*
    * This method prepares the test data of this class.
    */
    @testSetup static void prepareSetupData()
    {
          Account a = new Account(Name='Test Account Name');
          insert a;

          Contact c = new Contact(LastName = 'Contact Last Name', AccountId = a.id);
          insert c;

          User user = new User();
          user.ProfileID = [Select Id From Profile Where Name='Customer Community User'].id;
          user.EmailEncodingKey = 'ISO-8859-1';
          user.LanguageLocaleKey = 'en_US';
          user.TimeZoneSidKey = 'America/New_York';
          user.LocaleSidKey = 'en_US';
          user.FirstName = 'first';
          user.LastName = 'last';
          user.Username = 'test@appirio2.com';
          user.CommunityNickname = 'testUser123';
          user.Alias = 't1';
          user.Email = 'no@email.com';
          user.IsActive = true;
          user.ContactId = c.Id;
          insert user;
    }


     static testMethod void testforActualScenarios()
    {
        User userObj = [SELECT Id,ContactId, AccountId FROM User WHERE Username='test@appirio2.com'];
        System.RunAs(userObj) {
            //retrieve the contact.
            Contact contactObj = [SELECT Name,FirstName,LastName,Account.Name, Title, email,Phone,AccountId
                  FROM Contact where Id=: userObj.ContactId];

            System.assertEquals(contactObj.LastName,'Contact Last Name');


            List<Contact> conList = [SELECT Name,FirstName,LastName,Account.Name, Title, email,Phone,AccountId
                  FROM Contact where AccountID=:userObj.AccountId];

            System.assertEquals(conList[0].LastName,'Contact Last Name');

            //retrieve the account
             Account acct = [SELECT Id, Name FROM Account WHERE Id=:userObj.AccountId];
            System.assertEquals(acct.Name,'Test Account Name');

        }

    }
}