--- /dev/null
+<?php
+
+namespace Drupal\Tests\views\Functional;
+
+/**
+ * Tests output of Views.
+ *
+ * @group views
+ */
+class ViewsEscapingTest extends ViewTestBase {
+
+ /**
+ * Views used by this test.
+ *
+ * @var array
+ */
+ public static $testViews = ['test_page_display', 'test_field_header'];
+
+ /**
+ * Used by WebTestBase::setup()
+ *
+ * We need theme_test for testing against test_basetheme and test_subtheme.
+ *
+ * @var array
+ *
+ * @see \Drupal\simpletest\WebTestBase::setup()
+ */
+ public static $modules = ['views', 'theme_test'];
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setUp($import_test_views = TRUE) {
+ parent::setUp(TRUE);
+
+ $this->enableViewsTestModule();
+ }
+
+ /**
+ * Tests for incorrectly escaped markup in the views-view-fields.html.twig.
+ */
+ public function testViewsViewFieldsEscaping() {
+ // Test with system theme using theme function.
+ $this->drupalGet('test_page_display_200');
+
+ // Assert that there are no escaped '<'s characters.
+ $this->assertNoEscaped('<');
+
+ // Install theme to test with template system.
+ \Drupal::service('theme_handler')->install(['views_test_theme']);
+
+ // Make base theme default then test for hook invocations.
+ $this->config('system.theme')
+ ->set('default', 'views_test_theme')
+ ->save();
+ $this->assertEqual($this->config('system.theme')->get('default'), 'views_test_theme');
+
+ $this->drupalGet('test_page_display_200');
+
+ // Assert that we are using the correct template.
+ $this->assertText('force', 'The force is strong with this one');
+
+ // Assert that there are no escaped '<'s characters.
+ $this->assertNoEscaped('<');
+ }
+
+ /**
+ * Tests for incorrectly escaped markup in a header label on a display table.
+ */
+ public function testViewsFieldHeaderEscaping() {
+ // Test with a field header label having an html element wrapper.
+ $this->drupalGet('test_field_header');
+
+ // Assert that there are no escaped '<'s characters.
+ $this->assertNoEscaped('<');
+
+ // Test with a field header label having a XSS test as a wrapper.
+ $this->drupalGet('test_field_header_xss');
+
+ // Assert that XSS test is escaped.
+ $this->assertNoRaw('<script>alert("XSS")</script>', 'Harmful tags are escaped in header label.');
+ }
+
+}