Tests error border of multiple fields with same name in a page.
function testMultiFormSameNameErrorClass() {
$this
->drupalGet('form-test/double-form');
$edit = array();
$this
->drupalPost(NULL, $edit, t('Save'));
$this
->assertFieldByXpath('//input[@id="edit-name" and contains(@class, "error")]', NULL, 'Error input form element class found for first element.');
$this
->assertNoFieldByXpath('//input[@id="edit-name--2" and contains(@class, "error")]', NULL, 'No error input form element class found for second element.');
}