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diff --git a/web/core/tests/Drupal/Tests/Core/Block/BlockManagerTest.php b/web/core/tests/Drupal/Tests/Core/Block/BlockManagerTest.php
new file mode 100644
index 000000000..1e9bb436d
--- /dev/null
+++ b/web/core/tests/Drupal/Tests/Core/Block/BlockManagerTest.php
@@ -0,0 +1,89 @@
+<?php
+
+namespace Drupal\Tests\Core\Block;
+
+use Drupal\Component\Plugin\Discovery\DiscoveryInterface;
+use Drupal\Core\Block\BlockManager;
+use Drupal\Core\Cache\CacheBackendInterface;
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * @coversDefaultClass \Drupal\Core\Block\BlockManager
+ *
+ * @group block
+ */
+class BlockManagerTest extends UnitTestCase {
+
+  /**
+   * The block manager under test.
+   *
+   * @var \Drupal\Core\Block\BlockManager
+   */
+  protected $blockManager;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $cache_backend = $this->prophesize(CacheBackendInterface::class);
+    $module_handler = $this->prophesize(ModuleHandlerInterface::class);
+    $this->blockManager = new BlockManager(new \ArrayObject(), $cache_backend->reveal(), $module_handler->reveal());
+    $this->blockManager->setStringTranslation($this->getStringTranslationStub());
+
+    $discovery = $this->prophesize(DiscoveryInterface::class);
+    // Specify the 'broken' block, as well as 3 other blocks with admin labels
+    // that are purposefully not in alphabetical order.
+    $discovery->getDefinitions()->willReturn([
+      'broken' => [
+        'admin_label' => 'Broken/Missing',
+        'category' => 'Block',
+      ],
+      'block1' => [
+        'admin_label' => 'Coconut',
+        'category' => 'Group 2',
+      ],
+      'block2' => [
+        'admin_label' => 'Apple',
+        'category' => 'Group 1',
+      ],
+      'block3' => [
+        'admin_label' => 'Banana',
+        'category' => 'Group 2',
+      ],
+    ]);
+    // Force the discovery object onto the block manager.
+    $property = new \ReflectionProperty(BlockManager::class, 'discovery');
+    $property->setAccessible(TRUE);
+    $property->setValue($this->blockManager, $discovery->reveal());
+  }
+
+  /**
+   * @covers ::getDefinitions
+   */
+  public function testDefinitions() {
+    $definitions = $this->blockManager->getDefinitions();
+    $this->assertSame(['broken', 'block1', 'block2', 'block3'], array_keys($definitions));
+  }
+
+  /**
+   * @covers ::getSortedDefinitions
+   */
+  public function testSortedDefinitions() {
+    $definitions = $this->blockManager->getSortedDefinitions();
+    $this->assertSame(['block2', 'block3', 'block1'], array_keys($definitions));
+  }
+
+  /**
+   * @covers ::getGroupedDefinitions
+   */
+  public function testGroupedDefinitions() {
+    $definitions = $this->blockManager->getGroupedDefinitions();
+    $this->assertSame(['Group 1', 'Group 2'], array_keys($definitions));
+    $this->assertSame(['block2'], array_keys($definitions['Group 1']));
+    $this->assertSame(['block3', 'block1'], array_keys($definitions['Group 2']));
+  }
+
+}