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diff --git a/web/core/modules/system/tests/src/Functional/Module/ExperimentalModuleTest.php b/web/core/modules/system/tests/src/Functional/Module/ExperimentalModuleTest.php
new file mode 100644
index 000000000..177fc5ba1
--- /dev/null
+++ b/web/core/modules/system/tests/src/Functional/Module/ExperimentalModuleTest.php
@@ -0,0 +1,133 @@
+<?php
+
+namespace Drupal\Tests\system\Functional\Module;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests the installation of modules.
+ *
+ * @group Module
+ */
+class ExperimentalModuleTest extends BrowserTestBase {
+
+
+  /**
+   * The admin user.
+   *
+   * @var \Drupal\user\UserInterface
+   */
+  protected $adminUser;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    $this->adminUser = $this->drupalCreateUser(['access administration pages', 'administer modules']);
+    $this->drupalLogin($this->adminUser);
+  }
+
+  /**
+   * Tests installing experimental modules and dependencies in the UI.
+   */
+  public function testExperimentalConfirmForm() {
+
+    // First, test installing a non-experimental module with no dependencies.
+    // There should be no confirmation form and no experimental module warning.
+    $edit = [];
+    $edit["modules[test_page_test][enable]"] = TRUE;
+    $this->drupalPostForm('admin/modules', $edit, t('Install'));
+    $this->assertText('Module Test page has been enabled.');
+    $this->assertNoText('Experimental modules are provided for testing purposes only.');
+
+    // Uninstall the module.
+    \Drupal::service('module_installer')->uninstall(['test_page_test']);
+
+    // Next, test installing an experimental module with no dependencies.
+    // There should be a confirmation form with an experimental warning, but no
+    // list of dependencies.
+    $edit = [];
+    $edit["modules[experimental_module_test][enable]"] = TRUE;
+    $this->drupalPostForm('admin/modules', $edit, 'Install');
+
+    // The module should not be enabled and there should be a warning and a
+    // list of the experimental modules with only this one.
+    $this->assertNoText('Experimental Test has been enabled.');
+    $this->assertText('Experimental modules are provided for testing purposes only.');
+    $this->assertText('The following modules are experimental: Experimental Test');
+
+    // There should be no message about enabling dependencies.
+    $this->assertNoText('You must enable');
+
+    // Enable the module and confirm that it worked.
+    $this->drupalPostForm(NULL, [], 'Continue');
+    $this->assertText('Experimental Test has been enabled.');
+
+    // Uninstall the module.
+    \Drupal::service('module_installer')->uninstall(['experimental_module_test']);
+
+    // Test enabling a module that is not itself experimental, but that depends
+    // on an experimental module.
+    $edit = [];
+    $edit["modules[experimental_module_dependency_test][enable]"] = TRUE;
+    $this->drupalPostForm('admin/modules', $edit, 'Install');
+
+    // The module should not be enabled and there should be a warning and a
+    // list of the experimental modules with only this one.
+    $this->assertNoText('2 modules have been enabled: Experimental Dependency Test, Experimental Test');
+    $this->assertText('Experimental modules are provided for testing purposes only.');
+
+    $this->assertText('The following modules are experimental: Experimental Test');
+
+    // Ensure the non-experimental module is not listed as experimental.
+    $this->assertNoText('The following modules are experimental: Experimental Test, Experimental Dependency Test');
+    $this->assertNoText('The following modules are experimental: Experimental Dependency Test');
+
+    // There should be a message about enabling dependencies.
+    $this->assertText('You must enable the Experimental Test module to install Experimental Dependency Test');
+
+    // Enable the module and confirm that it worked.
+    $this->drupalPostForm(NULL, [], 'Continue');
+    $this->assertText('2 modules have been enabled: Experimental Dependency Test, Experimental Test');
+
+    // Uninstall the modules.
+    \Drupal::service('module_installer')->uninstall(['experimental_module_test', 'experimental_module_dependency_test']);
+
+    // Finally, check both the module and its experimental dependency. There is
+    // still a warning about experimental modules, but no message about
+    // dependencies, since the user specifically enabled the dependency.
+    $edit = [];
+    $edit["modules[experimental_module_test][enable]"] = TRUE;
+    $edit["modules[experimental_module_dependency_test][enable]"] = TRUE;
+    $this->drupalPostForm('admin/modules', $edit, 'Install');
+
+    // The module should not be enabled and there should be a warning and a
+    // list of the experimental modules with only this one.
+    $this->assertNoText('2 modules have been enabled: Experimental Dependency Test, Experimental Test');
+    $this->assertText('Experimental modules are provided for testing purposes only.');
+
+    $this->assertText('The following modules are experimental: Experimental Test');
+
+    // Ensure the non-experimental module is not listed as experimental.
+    $this->assertNoText('The following modules are experimental: Experimental Dependency Test, Experimental Test');
+    $this->assertNoText('The following modules are experimental: Experimental Dependency Test');
+
+    // There should be no message about enabling dependencies.
+    $this->assertNoText('You must enable');
+
+    // Enable the module and confirm that it worked.
+    $this->drupalPostForm(NULL, [], 'Continue');
+    $this->assertText('2 modules have been enabled: Experimental Dependency Test, Experimental Test');
+
+    // Try to enable an experimental module that can not be due to
+    // hook_requirements().
+    \Drupal::state()->set('experimental_module_requirements_test_requirements', TRUE);
+    $edit = [];
+    $edit["modules[experimental_module_requirements_test][enable]"] = TRUE;
+    $this->drupalPostForm('admin/modules', $edit, 'Install');
+    $this->assertUrl('admin/modules', [], 'If the module can not be installed we are not taken to the confirm form.');
+    $this->assertText('The Experimental Test Requirements module can not be installed.');
+  }
+
+}