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diff --git a/web/modules/contrib/ctools/tests/src/Unit/BlockVariantTraitTest.php b/web/modules/contrib/ctools/tests/src/Unit/BlockVariantTraitTest.php
new file mode 100644
index 000000000..892687943
--- /dev/null
+++ b/web/modules/contrib/ctools/tests/src/Unit/BlockVariantTraitTest.php
@@ -0,0 +1,149 @@
+<?php
+
+namespace Drupal\Tests\ctools\Unit;
+
+use Drupal\Component\Uuid\UuidInterface;
+use Drupal\ctools\Plugin\BlockPluginCollection;
+use Drupal\ctools\Plugin\BlockVariantTrait;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * Tests the methods of a block-based variant.
+ *
+ * @coversDefaultClass \Drupal\ctools\Plugin\BlockVariantTrait
+ *
+ * @group CTools
+ */
+class BlockVariantTraitTest extends UnitTestCase {
+
+  /**
+   * Tests the getRegionAssignments() method.
+   *
+   * @covers ::getRegionAssignments
+   *
+   * @dataProvider providerTestGetRegionAssignments
+   */
+  public function testGetRegionAssignments($expected, $blocks = []) {
+    $block_collection = $this->prophesize(BlockPluginCollection::class);
+    $block_collection->getAllByRegion()
+      ->willReturn($blocks)
+      ->shouldBeCalled();
+
+    $display_variant = new TestBlockVariantTrait();
+    $display_variant->setBlockPluginCollection($block_collection->reveal());
+
+    $this->assertSame($expected, $display_variant->getRegionAssignments());
+  }
+
+  public function providerTestGetRegionAssignments() {
+    return [
+      [
+        [
+          'top' => [],
+          'bottom' => [],
+        ],
+      ],
+      [
+        [
+          'top' => ['foo'],
+          'bottom' => [],
+        ],
+        [
+          'top' => ['foo'],
+        ],
+      ],
+      [
+        [
+          'top' => [],
+          'bottom' => [],
+        ],
+        [
+          'invalid' => ['foo'],
+        ],
+      ],
+      [
+        [
+          'top' => [],
+          'bottom' => ['foo'],
+        ],
+        [
+          'bottom' => ['foo'],
+          'invalid' => ['bar'],
+        ],
+      ],
+    ];
+  }
+
+}
+
+class TestBlockVariantTrait {
+  use BlockVariantTrait;
+
+  /**
+   * @var array
+   */
+  protected $blockConfig = [];
+
+  /**
+   * @var \Drupal\Component\Uuid\UuidInterface
+   */
+  protected $uuidGenerator;
+
+  /**
+   * @param BlockPluginCollection $block_plugin_collection
+   *
+   * @return $this
+   */
+  public function setBlockPluginCollection(BlockPluginCollection $block_plugin_collection) {
+    $this->blockPluginCollection = $block_plugin_collection;
+    return $this;
+  }
+
+  /**
+   * @param \Drupal\Component\Uuid\UuidInterface $uuid_generator
+   *
+   * @return $this
+   */
+  public function setUuidGenerator(UuidInterface $uuid_generator) {
+    $this->uuidGenerator = $uuid_generator;
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function uuidGenerator() {
+    return $this->uuidGenerator;
+  }
+
+  /**
+   * Sets the block configuration.
+   *
+   * @param array $config
+   *   The block configuration.
+   *
+   * @return $this
+   */
+  public function setBlockConfig(array $config) {
+    $this->blockConfig = $config;
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getBlockConfig() {
+    return $this->blockConfig;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getRegionNames() {
+    return [
+      'top' => 'Top',
+      'bottom' => 'Bottom',
+    ];
+  }
+
+}