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diff --git a/web/core/modules/migrate/tests/src/Kernel/process/ExtractTest.php b/web/core/modules/migrate/tests/src/Kernel/process/ExtractTest.php
new file mode 100644
index 000000000..8c747abad
--- /dev/null
+++ b/web/core/modules/migrate/tests/src/Kernel/process/ExtractTest.php
@@ -0,0 +1,111 @@
+<?php
+
+namespace Drupal\Tests\migrate\Kernel\process;
+
+use Drupal\KernelTests\KernelTestBase;
+use Drupal\migrate\MigrateExecutable;
+use Drupal\migrate\MigrateMessage;
+use Drupal\migrate\Plugin\MigrationInterface;
+
+/**
+ * Tests the extract process plugin.
+ *
+ * @group migrate
+ */
+class ExtractTest extends KernelTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['migrate'];
+
+  /**
+   * Returns test migration definition.
+   *
+   * @return array
+   */
+  public function getDefinition() {
+    return [
+      'source' => [
+        'plugin' => 'embedded_data',
+        'data_rows' => [],
+        'ids' => [
+          'id' => ['type' => 'string'],
+        ],
+      ],
+      'process' => [
+        'first' => [
+          'plugin' => 'extract',
+          'index' => [0],
+          'source' => 'simple_array',
+        ],
+        'second' => [
+          'plugin' => 'extract',
+          'index' => [1],
+          'source' => 'complex_array',
+        ],
+      ],
+      'destination' => [
+        'plugin' => 'config',
+        'config_name' => 'migrate_test.settings',
+      ],
+    ];
+  }
+
+  /**
+   * Tests multiple value handling.
+   *
+   * @dataProvider multipleValueProviderSource
+   *
+   * @param array $source_data
+   * @param array $expected_data
+   */
+  public function testMultipleValueExplode(array $source_data, array $expected_data) {
+    $definition = $this->getDefinition();
+    $definition['source']['data_rows'] = [$source_data];
+
+    $migration = \Drupal::service('plugin.manager.migration')->createStubMigration($definition);
+
+    $executable = new MigrateExecutable($migration, new MigrateMessage());
+    $result = $executable->import();
+
+    // Migration needs to succeed before further assertions are made.
+    $this->assertSame(MigrationInterface::RESULT_COMPLETED, $result);
+
+    // Compare with expected data.
+    $this->assertEquals($expected_data, \Drupal::config('migrate_test.settings')->get());
+  }
+
+  /**
+   * Provides multiple source data for "extract" process plugin test.
+   */
+  public function multipleValueProviderSource() {
+    $tests = [
+      [
+        'source_data' => [
+          'id' => '1',
+          'simple_array' => ['alpha', 'beta'],
+          'complex_array' => [['alpha', 'beta'], ['psi', 'omega']],
+        ],
+        'expected_data' => [
+          'first' => 'alpha',
+          'second' => ['psi', 'omega'],
+        ],
+      ],
+      [
+        'source_data' => [
+          'id' => '2',
+          'simple_array' => ['one'],
+          'complex_array' => [0, 1],
+        ],
+        'expected_data' => [
+          'first' => 'one',
+          'second' => 1,
+        ],
+      ],
+    ];
+
+    return $tests;
+  }
+
+}