Alter Views exposed filter form
You need to turn the new form item test into a widget by declaring the item in $form['#info']

So your code should look like the following:

function my_module_form_alter(&amp;$form, &amp;$form_state, $form_id){
  $form['test'] = array(
    '#type' =&gt; 'select',
    '#title' =&gt; 'New Filter',
    '#options' =&gt; array('value 1', 'value 2')
  );

  $form['#info']['test'] = array(
    'value' =&gt; 'test', 
  );
}