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diff --git a/web/core/modules/block/tests/src/Unit/Plugin/migrate/process/BlockRegionTest.php b/web/core/modules/block/tests/src/Unit/Plugin/migrate/process/BlockRegionTest.php
new file mode 100644
index 000000000..f473dc4c8
--- /dev/null
+++ b/web/core/modules/block/tests/src/Unit/Plugin/migrate/process/BlockRegionTest.php
@@ -0,0 +1,70 @@
+<?php
+
+namespace Drupal\Tests\block\Unit\Plugin\migrate\process;
+
+use Drupal\block\Plugin\migrate\process\BlockRegion;
+use Drupal\migrate\MigrateExecutableInterface;
+use Drupal\migrate\Row;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * @coversDefaultClass \Drupal\block\Plugin\migrate\process\BlockRegion
+ * @group block
+ */
+class BlockRegionTest extends UnitTestCase {
+
+  /**
+   * Transforms a value through the block_region plugin.
+   *
+   * @param array $value
+   *   The value to transform.
+   * @param \Drupal\migrate\Row|null $row
+   *   (optional) The mocked row.
+   *
+   * @return array|string
+   *   The transformed value.
+   */
+  protected function transform(array $value, Row $row = NULL) {
+    $executable = $this->prophesize(MigrateExecutableInterface::class)->reveal();
+    if (empty($row)) {
+      $row = $this->prophesize(Row::class)->reveal();
+    }
+
+    $configuration = [
+      'map' => [
+        'bartik' => [
+          'bartik' => [
+            'triptych_first' => 'triptych_first',
+            'triptych_middle' => 'triptych_second',
+            'triptych_last' => 'triptych_third',
+          ],
+        ],
+      ],
+      'default_value' => 'content',
+    ];
+
+    $plugin = new BlockRegion($configuration, 'block_region', [], $configuration['map']['bartik']['bartik']);
+    return $plugin->transform($value, $executable, $row, 'foo');
+  }
+
+  /**
+   * If the source and destination themes are identical, the region should only
+   * be passed through if it actually exists in the destination theme.
+   *
+   * @covers ::transform
+   */
+  public function testTransformSameThemeRegionExists() {
+    $this->assertSame('triptych_second', $this->transform(['bartik', 'bartik', 'triptych_middle']));
+  }
+
+  /**
+   * If the source and destination themes are identical, the region should be
+   * changed to 'content' if it doesn't exist in the destination theme.
+   *
+   * @covers ::transform
+   */
+  public function testTransformSameThemeRegionNotExists() {
+    $this->assertSame('content', $this->transform(['bartik', 'bartik', 'footer']));
+  }
+
+}