Draft: Issue #3318694: Added Module LoadTest.

Closes #3318694

tests/src/Functional/LoadTest.php

+<?php
+
+namespace Drupal\Tests\modules_info\Functional;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Test Module Info Module Installation.
+ *
+ * @group modules_info
+ */
+class LoadTest extends BrowserTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaultTheme = 'stable';
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = ['block', 'modules_info'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp(): void {
+
+    parent::setUp();
+    $this->drupalPlaceBlock('page_title_block');
+  }
+
+  /**
+   * Tests Homepage after enabling Modules Info Module.
+   */
+  public function testHomepage() {
+
+    // Test homepage.
+    $this->drupalGet('<front>');
+    $this->assertSession()->statusCodeEquals(200);
+
+    // Minimal homepage title.
+    $this->assertSession()->pageTextContains('Log in');
+  }
+
+  /**
+   * Tests the Modules Info module unistall.
+   */
+  public function testModuleUninstall() {
+
+    $admin_user = $this->drupalCreateUser([
+      'access administration pages',
+      'administer site configuration',
+      'administer modules',
+    ]);
+
+    // Uninstall the module.
+    $this->drupalLogin($admin_user);
+    $this->drupalGet('/admin/modules/uninstall');
+    $this->assertSession()->statusCodeEquals(200);
+    $this->assertSession()->pageTextContains('Modules Info');
+    $this->submitForm(['uninstall[modules_info]' => TRUE], 'Uninstall');
+    $this->submitForm([], 'Uninstall');
+    $this->assertSession()->pageTextContains('The selected modules have been uninstalled.');
+    $this->assertSession()->pageTextNotContains('Modules Info');
+
+    // Visit the frontpage.
+    $this->drupalGet('<front>');
+    $this->assertSession()->statusCodeEquals(200);
+  }
+
+  /**
+   * Tests Modules Info module reinstalling after being uninstalled.
+   */
+  public function testReinstallAfterUninstall() {
+
+    $admin_user = $this->drupalCreateUser([
+      'access administration pages',
+      'administer site configuration',
+      'administer modules',
+    ]);
+
+    // Uninstall the module.
+    $this->drupalLogin($admin_user);
+
+    $assert_session = $this->assertSession();
+    $page = $this->getSession()->getPage();
+
+    // Uninstall the Modules Info module.
+    $this->container->get('module_installer')->uninstall(['modules_info'], FALSE);
+
+    $this->drupalGet('/admin/modules');
+    $page->checkField('modules[modules_info][enable]');
+    $page->pressButton('Install');
+    $assert_session->pageTextNotContains('Unable to install Modules Info');
+    $assert_session->pageTextContains('Module Modules Info has been enabled');
+
+    // Visit the frontpage.
+    $this->drupalGet('<front>');
+    $this->assertSession()->statusCodeEquals(200);
+  }
+
+}