diff -u b/advagg_mod/src/Tests/ModifierPagesTest.php b/advagg_mod/src/Tests/ModifierPagesTest.php
--- b/advagg_mod/src/Tests/ModifierPagesTest.php
+++ b/advagg_mod/src/Tests/ModifierPagesTest.php
@@ -8,6 +8,7 @@
 namespace Drupal\advagg_mod\Tests;
 
 use Drupal\advagg\Tests\AdminPagesTest;
+use Drupal\Core\Url;
 
 /**
  * Tests that all the AdvAgg Modifier path(s) return valid content.
@@ -32,2 +33,11 @@
 
+  /**
+   * Tests that the main admin path returns correct contents.
+   */
+  public function testLoad() {
+    foreach ($this->routes as $route) {
+      $this->drupalGet(Url::fromRoute($route));
+      $this->assertResponse(200);
+    }
+  }
 }
diff -u b/advagg_validator/src/Tests/ValidatorPagesTest.php b/advagg_validator/src/Tests/ValidatorPagesTest.php
--- b/advagg_validator/src/Tests/ValidatorPagesTest.php
+++ b/advagg_validator/src/Tests/ValidatorPagesTest.php
@@ -8,6 +8,7 @@
 namespace Drupal\advagg_validator\Tests;
 
 use Drupal\advagg\Tests\AdminPagesTest;
+use Drupal\Core\Url;
 
 /**
  * Tests that all the AdvAgg validator path(s) return valid content.
@@ -35,2 +36,12 @@
 
+  /**
+   * Tests that the main admin path returns correct contents.
+   */
+  public function testLoad() {
+    foreach ($this->routes as $route) {
+      $this->drupalGet(Url::fromRoute($route));
+      $this->assertResponse(200);
+    }
+  }
+
 }