dummy example of mocking

test.js

describe(function(){
  
  afterEach(function(){
    removeMock( mysqlConnection, "query" );
  });

  it( "should return error because user doesnt exist", function(){
    mock( mysqlConnection, "query", function( sql, params, cb ){
      ( cb||params )( null, [] );
    });

    userModel.getUserName( "ID13", function( err, result ){
      should.exist( err );
    });
  });
});