diff --git a/core/modules/filter/lib/Drupal/filter/Tests/FilterAdminTest.php b/core/modules/filter/lib/Drupal/filter/Tests/FilterAdminTest.php
index 38ef433..0c26fde 100644
--- a/core/modules/filter/lib/Drupal/filter/Tests/FilterAdminTest.php
+++ b/core/modules/filter/lib/Drupal/filter/Tests/FilterAdminTest.php
@@ -134,11 +134,15 @@ function testFilterAdmin() {
     $full = 'full_html';
     $plain = 'plain_text';
 
+    $this->assertTrue(\Drupal::cache('filter')->isEmpty(), 'Cache is empty.');
+
     // Check that the fallback format exists and cannot be disabled.
     $this->assertTrue($plain == filter_fallback_format(), 'The fallback format is set to plain text.');
     $this->drupalGet('admin/config/content/formats');
+    $this->assertTrue(\Drupal::cache('filter')->isEmpty(), 'Cache is still empty.');
     $this->assertNoRaw('admin/config/content/formats/manage/' . $plain . '/disable', 'Disable link for the fallback format not found.');
     $this->drupalGet('admin/config/content/formats/manage/' . $plain . '/disable');
+    $this->assertTrue(\Drupal::cache('filter')->isEmpty(), 'Surprise.');
     $this->assertResponse(403, 'The fallback format cannot be disabled.');
 
     // Verify access permissions to Full HTML format.
@@ -150,11 +154,13 @@ function testFilterAdmin() {
     $edit = array();
     $edit['filters[filter_html][settings][allowed_html]'] = '<a> <em> <strong> <cite> <code> <ul> <ol> <li> <dl> <dt> <dd> <quote>';
     $this->drupalPostForm('admin/config/content/formats/manage/' . $restricted, $edit, t('Save configuration'));
+    $this->assertTrue(\Drupal::cache('filter')->isEmpty(), 'Nothing in here.');
     $this->assertUrl('admin/config/content/formats');
     $this->drupalGet('admin/config/content/formats/manage/' . $restricted);
+    $this->assertTrue(\Drupal::cache('filter')->isEmpty(), 'Really nothing?');
     $this->assertFieldByName('filters[filter_html][settings][allowed_html]', $edit['filters[filter_html][settings][allowed_html]'], 'Allowed HTML tag added.');
 
-    $this->assertTrue(\Drupal::cache('filter')->isEmpty(), 'Cache cleared.');
+    $this->assertTrue(\Drupal::cache('filter')->isEmpty(), 'Cache cleared... sort of');
 
     $elements = $this->xpath('//select[@name=:first]/following::select[@name=:second]', array(
       ':first' => 'filters[' . $first_filter . '][weight]',