removeClass example

/** * Tests removing class attributes with the AttributeArray helper method. * @covers ::removeClass */
  public function testRemoveClasses() {
    // Add duplicate class to ensure that both duplicates are removed.     $classes = ['example-class', 'aa', 'xx', 'yy', 'red', 'green', 'blue', 'red'];
    $attribute = new Attribute(['class' => $classes]);

    // Remove one class.     $attribute->removeClass('example-class');
    $this->assertNotContains('example-class', $attribute['class']->value());

    // Remove multiple classes.     $attribute->removeClass('xx', 'yy');
    $this->assertNotContains(['xx', 'yy'], $attribute['class']->value());

    // Remove an array of classes.     $attribute->removeClass(['red', 'green', 'blue']);
    $this->assertNotContains(['red', 'green', 'blue'], $attribute['class']->value());

    // Remove a class that does not exist.