Creates a user with a given role using the Drupal simpletest framework.

drupalCreateUserWithRole.php

/**
 * Creates a user with the give role.
 **/
public function drupalCreateUserWithRole($role) {
  // Get all of the roles in the system.
  $roles = user_roles();
 
  // Find the index for the role we want to assign to the user.
  $index = array_search($role, $roles);
 
  // Get the permissions for the role.
  $permissions = user_role_permissions(array(array_search($role, $roles) => $role));
 
  // Create the user with the permissions.
  $user = $this->drupalCreateUser(array_keys($permissions[$index]));
 
  // Assign the role.
  $user->roles[$index] = $role;
 
  // Return the user we have created.
  return user_save($user);
}

Hi David
I cannot run this script , I have two problesm :
1 - Parse error: syntax error, unexpected 'public' (T_PUBLIC) in line 4
I remove 'public' and this skipped
2 - Fatal error: Call to undefined function user_roles() in line 6
I think this script needs includes and requires other files,is this true?

This version actually gives the user the role instead of giving them the same permissions as the role. Most of this is identical to drupalCreateUser().

  /**
   * Create a user with a given set of roles.
   *
   * @param array $roles
   *   Array of role names to assign to the user. Note that the user always has
   *   the "authenticated users" role.
   *
   * @return object|false
   *   A fully loaded user object with pass_raw property, or FALSE if account
   *   creation fails.
   */
  protected function drupalCreateUserWithRole(array $roles = []) {
    // Create an array like [$rid => $rid] with the roles in $role.
    static $user_roles;
    if (!isset($user_roles)) {
      $user_roles = user_roles();
    }
    $rids = [];
    foreach ($roles as $role) {
      $rid = array_search($role, $user_roles);
      $rids[$rid] = $rid;
    }

    // Create a user assigned to that role.
    $edit = array();
    $edit['name'] = $this->randomName();
    $edit['mail'] = $edit['name'] . '@example.com';
    $edit['pass'] = user_password();
    $edit['status'] = 1;
    if ($rids) {
      $edit['roles'] = $rids;
    }

    $account = user_save(drupal_anonymous_user(), $edit);

    $this->assertTrue(!empty($account->uid), t('User created with name %name and pass %pass', array('%name' => $edit['name'], '%pass' => $edit['pass'])), t('User login'));
    if (empty($account->uid)) {
      return FALSE;
    }

    // Add the raw password so that we can log in as this user.
    $account->pass_raw = $edit['pass'];
    return $account;
  }