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diff --git a/web/core/modules/block/tests/src/Functional/BlockRenderOrderTest.php b/web/core/modules/block/tests/src/Functional/BlockRenderOrderTest.php
new file mode 100644
index 000000000..2fd1ab892
--- /dev/null
+++ b/web/core/modules/block/tests/src/Functional/BlockRenderOrderTest.php
@@ -0,0 +1,80 @@
+<?php
+
+namespace Drupal\Tests\block\Functional;
+
+use Drupal\Component\Utility\Html;
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests blocks are being rendered in order by weight.
+ *
+ * @group block
+ */
+class BlockRenderOrderTest extends BrowserTestBase {
+
+  /**
+   * Modules to install.
+   *
+   * @var array
+   */
+  public static $modules = ['node', 'block'];
+
+  protected function setUp() {
+    parent::setUp();
+    // Create a test user.
+    $end_user = $this->drupalCreateUser([
+      'access content',
+    ]);
+    $this->drupalLogin($end_user);
+  }
+
+  /**
+   * Tests the render order of the blocks.
+   */
+  public function testBlockRenderOrder() {
+    // Enable test blocks and place them in the same region.
+    $region = 'header';
+    $test_blocks = [
+      'stark_powered' => [
+        'weight' => '-3',
+        'id' => 'stark_powered',
+        'label' => 'Test block A',
+      ],
+      'stark_by' => [
+        'weight' => '3',
+        'id' => 'stark_by',
+        'label' => 'Test block C',
+      ],
+      'stark_drupal' => [
+        'weight' => '3',
+        'id' => 'stark_drupal',
+        'label' => 'Test block B',
+      ],
+    ];
+
+    // Place the test blocks.
+    foreach ($test_blocks as $test_block) {
+      $this->drupalPlaceBlock('system_powered_by_block', [
+        'label' => $test_block['label'],
+        'region' => $region,
+        'weight' => $test_block['weight'],
+        'id' => $test_block['id'],
+      ]);
+    }
+
+    $this->drupalGet('');
+    $test_content = $this->getRawContent('');
+
+    $controller = $this->container->get('entity_type.manager')->getStorage('block');
+    foreach ($controller->loadMultiple() as $return_block) {
+      $id = $return_block->id();
+      if ($return_block_weight = $return_block->getWeight()) {
+        $this->assertTrue($test_blocks[$id]['weight'] == $return_block_weight, 'Block weight is set as "' . $return_block_weight . '" for ' . $id . ' block.');
+        $position[$id] = strpos($test_content, Html::getClass('block-' . $test_blocks[$id]['id']));
+      }
+    }
+    $this->assertTrue($position['stark_powered'] < $position['stark_by'], 'Blocks with different weight are rendered in the correct order.');
+    $this->assertTrue($position['stark_drupal'] < $position['stark_by'], 'Blocks with identical weight are rendered in alphabetical order.');
+  }
+
+}