+<?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']));
+ }
+
+}