diff --git a/core/modules/layout_discovery/tests/src/Kernel/LayoutTest.php b/core/modules/layout_discovery/tests/src/Kernel/LayoutTest.php
index 6d2bd51..f53be07 100644
--- a/core/modules/layout_discovery/tests/src/Kernel/LayoutTest.php
+++ b/core/modules/layout_discovery/tests/src/Kernel/LayoutTest.php
@@ -80,6 +80,7 @@ protected function render(array &$elements) {
    * Data provider for testRenderLayout().
    */
   public function renderLayoutData() {
+    $html = [];
     $html[] = '<div data-drupal-selector="edit-layout" class="layout--onecol">';
     $html[] = '<div class="layout__region layout__region--content">';
     $html[] = 'This is the content';
@@ -96,6 +97,7 @@ public function renderLayoutData() {
       $html,
     ];
 
+    $html = [];
     $html[] = '<div class="layout-example-1col clearfix">';
     $html[] = '<div class="region-top">';
     $html[] = 'This string added by #process.';
@@ -118,6 +120,7 @@ public function renderLayoutData() {
       $html,
     ];
 
+    $html = [];
     $html[] = '<div class="layout-example-1col clearfix">';
     $html[] = '<div class="region-top">';
     $html[] = 'This is the top';
@@ -140,6 +143,7 @@ public function renderLayoutData() {
       $html,
     ];
 
+    $html = [];
     $html[] = '<div data-drupal-selector="edit-layout" class="layout--layout-test-1col-no-template">';
     $html[] = '<div class="layout__region layout__region--top">';
     $html[] = 'This is the top';
@@ -162,6 +166,7 @@ public function renderLayoutData() {
       $html,
     ];
 
+    $html = [];
     $html[] = '<div class="layout-example-2col clearfix">';
     $html[] = '<div class="region-left">';
     $html[] = 'This is the left';
@@ -184,6 +189,7 @@ public function renderLayoutData() {
       $html,
     ];
 
+    $html = [];
     $html[] = '<div class="layout-test-plugin clearfix">';
     $html[] = '<div>';
     $html[] = '<span class="setting-1-label">Blah: </span>';