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// use module to resolve services
DI.Module defaultModule = DI.getModule(DefaultServiceModule.class);
IAccountService accountServiceInstance = (IAccountService) defaultModule.getService(IAccountService.class);

List<Account> defaultResult = accountServiceInstance.getAccounts();
system.debug('Default result');
system.debug(defaultResult);

DI.Module mockModule = DI.getModule(MockServiceModule.class);
IAccountService mockAccountServiceInstance = (IAccountService) mockModule.getService(IAccountService.class);

List<Account> mockResult = mockAccountServiceInstance.getAccounts();
system.debug('mock result');
system.debug(mockResult);

public with sharing class AccountService implements IAccountService {
  public List<Account> getAccounts() {
    return [
      SELECT Id, Name
      FROM Account
    ];
  }
}

public with sharing class MockAccountService implements IAccountService {
  public List<Account> getAccounts() {
    List<Account> accounts = new List<Account> {
      new Account(Name='qaa'),
      new Account(Name='qab'),
      new Account(Name='qac')
    };

    return accounts;
  }
}

public with sharing class DefaultServiceModule extends DI.Module {
  public override void configure(DI.ServiceCollection services) {
    services.addSingleton('IAccountService', 'AccountService');
  }
}

public with sharing class MockServiceModule extends DI.Module {
  public override void configure(DI.ServiceCollection services) {
    services.addSingleton('IAccountService', 'MockAccountService');
  }
}