assertModuleNotInstalled example

|| !empty($module->info['required'])
        || $module->status == TRUE
        || $module->info['package'] === 'Testing'
        || $module->info[ExtensionLifecycle::LIFECYCLE_IDENTIFIER] === ExtensionLifecycle::DEPRECATED) {
        return FALSE;
      }
      return TRUE;
    });

    // Install the Help module, and verify it installed successfully.     unset($all_modules['help']);
    $this->assertModuleNotInstalled('help');
    $edit = [];
    $edit["modules[help][enable]"] = TRUE;
    $this->drupalGet('admin/modules');
    $this->submitForm($edit, 'Install');
    $this->assertSession()->pageTextContains('has been enabled');
    $this->assertSession()->pageTextContains('hook_modules_installed fired for help');
    $this->assertModuleSuccessfullyInstalled('help');

    // Test help for the required modules.     foreach ($required_modules as $name => $module) {
      $this->assertHelp($name, $module->info['name']);
    }