diff -u b/core/modules/views_ui/tests/src/Functional/FilterNumericWebTest.php b/core/modules/views_ui/tests/src/Functional/FilterNumericWebTest.php
--- b/core/modules/views_ui/tests/src/Functional/FilterNumericWebTest.php
+++ b/core/modules/views_ui/tests/src/Functional/FilterNumericWebTest.php
@@ -112,9 +112,9 @@
     $this->assertSession()->elementTextContains('css', 'fieldset#edit-age-wrapper', 'Age between');
     // Check the min/max labels.
     $min_element_label = $this->xpath('//fieldset[contains(@id, "edit-age-wrapper")]//label[contains(@for, "edit-age-min") and contains(text(), "Min")]');
-    $this->assertTrue(!empty($min_element_label));
+    $this->assertCount(1, $min_element_label);
     $max_element_label = $this->xpath('//fieldset[contains(@id, "edit-age-wrapper")]//label[contains(@for, "edit-age-max") and contains(text(), "Max")]');
-    $this->assertTrue(!empty($max_element_label));
+    $this->assertCount(1, $max_element_label);
     // Check that the description is shown in the right place.
     $this->assertEquals(trim($this->cssSelect('#edit-age-wrapper--description')[0]->getText()), 'Description of the exposed filter');
 
@@ -133,7 +133,7 @@
 
     // Make sure the label is visible and that there's no fieldset wrapper.
     $label = $this->xpath('//label[contains(@for, "edit-age") and contains(text(), "Age greater than")]');
-    $this->assertTrue(!empty($label));
+    $this->assertCount(1, $label);
     $fieldset = $this->xpath('//fieldset[contains(@id, "edit-age-wrapper")]');
     $this->assertTrue(empty($fieldset));
   }