--- /dev/null
+<?php
+
+namespace Drupal\FunctionalTests\Routing;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests incoming path case insensitivity.
+ *
+ * @group routing
+ */
+class CaseInsensitivePathTest extends BrowserTestBase {
+
+ /**
+ * {@inheritdoc}
+ */
+ public static $modules = ['system', 'views', 'node', 'system_test'];
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function setUp() {
+ parent::setUp();
+ \Drupal::state()->set('system_test.module_hidden', FALSE);
+ $this->createContentType(['type' => 'page']);
+ }
+
+ /**
+ * Tests mixed case paths.
+ */
+ public function testMixedCasePaths() {
+ // Tests paths defined by routes from standard modules as anonymous.
+ $this->drupalGet('user/login');
+ $this->assertSession()->statusCodeEquals(200);
+ $this->assertSession()->pageTextMatches('/Log in/');
+ $this->drupalGet('User/Login');
+ $this->assertSession()->statusCodeEquals(200);
+ $this->assertSession()->pageTextMatches('/Log in/');
+
+ // Tests paths defined by routes from the Views module.
+ $admin = $this->drupalCreateUser(['access administration pages', 'administer nodes', 'access content overview']);
+ $this->drupalLogin($admin);
+
+ $this->drupalGet('admin/content');
+ $this->assertSession()->statusCodeEquals(200);
+ $this->assertSession()->pageTextMatches('/Content/');
+ $this->drupalGet('Admin/Content');
+ $this->assertSession()->statusCodeEquals(200);
+ $this->assertSession()->pageTextMatches('/Content/');
+
+ // Tests paths with query arguments.
+
+ // Make sure our node title doesn't exist.
+ $this->drupalGet('admin/content');
+ $this->assertSession()->linkNotExists('FooBarBaz');
+ $this->assertSession()->linkNotExists('foobarbaz');
+
+ // Create a node, and make sure it shows up on admin/content.
+ $node = $this->createNode([
+ 'title' => 'FooBarBaz',
+ 'type' => 'page',
+ ]);
+
+ $this->drupalGet('admin/content', [
+ 'query' => [
+ 'title' => 'FooBarBaz'
+ ]
+ ]);
+
+ $this->assertSession()->linkExists('FooBarBaz');
+ $this->assertSession()->linkByHrefExists($node->toUrl()->toString());
+
+ // Make sure the path is case-insensitive, and query case is preserved.
+
+ $this->drupalGet('Admin/Content', [
+ 'query' => [
+ 'title' => 'FooBarBaz'
+ ]
+ ]);
+
+ $this->assertSession()->linkExists('FooBarBaz');
+ $this->assertSession()->linkByHrefExists($node->toUrl()->toString());
+ $this->assertSession()->fieldValueEquals('edit-title', 'FooBarBaz');
+ // Check that we can access the node with a mixed case path.
+ $this->drupalGet('NOdE/' . $node->id());
+ $this->assertSession()->statusCodeEquals(200);
+ $this->assertSession()->pageTextMatches('/FooBarBaz/');
+ }
+
+ /**
+ * Tests paths with slugs.
+ */
+ public function testPathsWithArguments() {
+ $this->drupalGet('system-test/echo/foobarbaz');
+ $this->assertSession()->statusCodeEquals(200);
+ $this->assertSession()->pageTextMatches('/foobarbaz/');
+ $this->assertSession()->pageTextNotMatches('/FooBarBaz/');
+
+ $this->drupalGet('system-test/echo/FooBarBaz');
+ $this->assertSession()->statusCodeEquals(200);
+ $this->assertSession()->pageTextMatches('/FooBarBaz/');
+ $this->assertSession()->pageTextNotMatches('/foobarbaz/');
+
+ // Test utf-8 characters in the route path.
+ $this->drupalGet('/system-test/Ȅchȏ/meΦω/ABc123');
+ $this->assertSession()->statusCodeEquals(200);
+ $this->assertSession()->pageTextMatches('/ABc123/');
+ $this->drupalGet('/system-test/ȅchȎ/MEΦΩ/ABc123');
+ $this->assertSession()->statusCodeEquals(200);
+ $this->assertSession()->pageTextMatches('/ABc123/');
+ }
+
+}