Issue #3081002: Main menu inaccessible after disabling Taxonomy Menu

Closes #3081002

tests/src/Functional/TaxonomyMenuOperationsTest.php

@@ -181,4 +181,25 @@ class TaxonomyMenuOperationsTest extends BrowserTestBase {
     );
   }
 
+  /**
+   * Test of disabling the Taxonomy term module.
+   */
+  public function testDisableModule() {
+    // Uninstall the module and ensure the service provider's service is not registered.
+    \Drupal::service('module_installer')->uninstall(['taxonomy_menu']);
+    $this->assertFalse(\Drupal::hasService('taxonomy_menu.helper'), 'The taxonomy_menu.helper service does not exist in the DIC.');
+
+    // We should expect not to find this page.
+    $this->drupalGet('admin/structure/taxonomy_menu');
+    $this->assertSession()->pageTextContains('Page not found');
+
+    // We should expect to see the Test menu in list of menu.
+    $this->drupalGet('admin/structure/menu');
+    $this->assertSession()->pageTextContains('Test');
+
+    // We should expect to see the Test menu in list of taxonomy vocabularies.
+    $this->drupalGet('admin/structure/taxonomy');
+    $this->assertSession()->pageTextContains('Test');
+  }
+
 }