Index: includes/tests/form.test
===================================================================
RCS file: includes/tests/form.test
diff -N includes/tests/form.test
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ includes/tests/form.test	19 Jul 2008 18:31:40 -0000
@@ -0,0 +1,74 @@
+<?php
+// $Id$
+
+/**
+ * @file
+ * Unit tests for the Drupal Form API.
+ */
+
+class FormsTestCase extends DrupalWebTestCase {
+
+  function getInfo() {
+    return array(
+      'name' => t('Make sure required fields fail validation if they are empty.'),
+      'description' => t('Carriage returns, tabs, and spaces are not valid content for a required field.'),
+      'group' => t('Form API'),
+    );
+  }
+
+  /**
+   * Check several empty values for required forms elements.
+   *
+   * If the form field is found in form_get_errors() then the test pass.
+   */
+  function testRequiredFields() {
+    // Originates from http://drupal.org/node/117748
+    // Sets of empty strings and arrays
+    $empty_strings = array('""' => "", '"\n"' => "\n", '" "' => " ", '"\t"' => "\t", '" \n\t "' => " \n\t ", '"\n\n\n\n\n"' => "\n\n\n\n\n");
+    $empty_arrays = array('array()' => array());
+
+    $elements['textfield']['element'] = array('#title' => $this->randomName(), '#type' => 'textfield', '#required' => TRUE);
+    $elements['textfield']['empty_values'] = $empty_strings;
+
+    $elements['password']['element'] = array('#title' => $this->randomName(), '#type' => 'password', '#required' => TRUE);
+    $elements['password']['empty_values'] = $empty_strings;
+
+    $elements['password_confirm']['element'] = array('#title' => $this->randomName(), '#type' => 'password_confirm', '#required' => TRUE);
+    $elements['password_confirm']['empty_values'] = $empty_strings;
+
+    $elements['textarea']['element'] = array('#title' => $this->randomName(), '#type' => 'textarea', '#required' => TRUE);
+    $elements['textarea']['empty_values'] = $empty_strings;
+
+    $elements['radios']['element'] = array('#title' => $this->randomName(), '#type' => 'radios', '#required' => TRUE, '#options' => array($this->randomName(), $this->randomName(), $this->randomName()));
+    $elements['radios']['empty_values'] = $empty_arrays;
+
+    $elements['checkboxes']['element'] = array('#title' => $this->randomName(), '#type' => 'checkboxes', '#required' => TRUE,'#options' => array($this->randomName(), $this->randomName(), $this->randomName()));
+    $elements['checkboxes']['empty_values'] = $empty_arrays;
+
+    $elements['select']['element'] = array('#title' => $this->randomName(), '#type' => 'select', '#required' => TRUE, '#options' => array($this->randomName(), $this->randomName(), $this->randomName()));
+    $elements['select']['empty_values'] = $empty_strings;
+
+    $elements['file']['element'] = array('#title' => $this->randomName(), '#type' => 'file', '#required' => TRUE);
+    $elements['file']['empty_values'] = $empty_strings;
+
+    // Go through all the elements and all the empty values for them
+    foreach ($elements as $type => $data) {
+      foreach ($data['empty_values'] as $key => $empty) {
+        $form_id = $this->randomName();
+        $form = $form_state = array();
+        $form['op'] = array('#type' => 'submit', '#value' => t('Submit'));
+        $element = $data['element']['#title'];
+        $form[$element] = $data['element'];
+        $form_state['values'][$element] = $empty;
+        $form['#post'] = $form_state['values'];
+        $form['#post']['form_id'] = $form_id;
+        drupal_prepare_form($form_id, $form, $form_state);
+        drupal_process_form($form_id, $form, $form_state);
+        $errors = form_get_errors();
+        $this->assertTrue(isset($errors[$element]), "Check empty($key) '$type' field '$element'");
+      }
+    }
+    // Clear the expected form error messages so they don't appear as exceptions.
+    drupal_get_messages();
+  }
+}