From 445132dfbd98b59349fc3bbf21c27e6e665f0cce Mon Sep 17 00:00:00 2001
From: Lee Rowlands <lee.rowlands@previousnext.com.au>
Date: Fri, 11 Oct 2019 17:50:02 +1000
Subject: [PATCH] Issue #3009014 by amateescu, mikelutz, quietone, heddn:
 Convert path alias migrations to use entity:path_alias destination

---
 .../Plugin/migrate/process/NullCoalesce.php   |  57 +++++++++
 .../src/Unit/process/NullCoalesceTest.php     |  92 ++++++++++++++
 core/modules/path/migrations/d6_url_alias.yml |  25 +++-
 core/modules/path/migrations/d7_url_alias.yml |  18 ++-
 .../Plugin/migrate/destination/UrlAlias.php   |  91 ++++----------
 .../migrate/process/PathSetTranslated.php     |  75 ++++++++++++
 .../Migrate/d6/LegacyMigrateUrlAliasTest.php  | 115 ++++++++++++++++++
 .../Migrate/d7/LegacyMigrateUrlAliasTest.php  | 110 +++++++++++++++++
 .../migrate/process/PathSetTranslatedTest.php |  71 +++++++++++
 9 files changed, 576 insertions(+), 78 deletions(-)
 create mode 100644 core/modules/migrate/src/Plugin/migrate/process/NullCoalesce.php
 create mode 100644 core/modules/migrate/tests/src/Unit/process/NullCoalesceTest.php
 create mode 100644 core/modules/path/src/Plugin/migrate/process/PathSetTranslated.php
 create mode 100644 core/modules/path/tests/src/Kernel/Migrate/d6/LegacyMigrateUrlAliasTest.php
 create mode 100644 core/modules/path/tests/src/Kernel/Migrate/d7/LegacyMigrateUrlAliasTest.php
 create mode 100644 core/modules/path/tests/src/Unit/migrate/process/PathSetTranslatedTest.php

diff --git a/core/modules/migrate/src/Plugin/migrate/process/NullCoalesce.php b/core/modules/migrate/src/Plugin/migrate/process/NullCoalesce.php
new file mode 100644
index 00000000000..eda70f988e2
--- /dev/null
+++ b/core/modules/migrate/src/Plugin/migrate/process/NullCoalesce.php
@@ -0,0 +1,57 @@
+<?php
+
+namespace Drupal\migrate\Plugin\migrate\process;
+
+use Drupal\migrate\MigrateException;
+use Drupal\migrate\MigrateExecutableInterface;
+use Drupal\migrate\ProcessPluginBase;
+use Drupal\migrate\Row;
+
+/**
+ * Provides a Null Coalesce process plugin.
+ *
+ * Given a set of values provided to the plugin, the plugin will return the
+ * first non-null value.
+ *
+ * Available configuration keys:
+ * - source: The input array.
+ * - default_value: (optional) The value to return if all values are NULL.
+ *   if not provided, NULL is returned if all values are NULL.
+ *
+ * Example:
+ * Given source keys of foo, bar, and baz:
+ *
+ * process_key:
+ *   plugin: null_coalesce
+ *   source:
+ *     - foo
+ *     - bar
+ *     - baz
+ *
+ * This plugin will return the equivalent of `foo ?? bar ?? baz`
+ *
+ * @MigrateProcessPlugin(
+ *   id = "null_coalesce"
+ * )
+ */
+class NullCoalesce extends ProcessPluginBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
+    if (!is_array($value)) {
+      throw new MigrateException("The input value should be an array.");
+    }
+    foreach ($value as $val) {
+      if (NULL !== $val) {
+        return $val;
+      }
+    }
+    if (isset($this->configuration['default_value'])) {
+      return $this->configuration['default_value'];
+    }
+    return NULL;
+  }
+
+}
diff --git a/core/modules/migrate/tests/src/Unit/process/NullCoalesceTest.php b/core/modules/migrate/tests/src/Unit/process/NullCoalesceTest.php
new file mode 100644
index 00000000000..8779be98fa9
--- /dev/null
+++ b/core/modules/migrate/tests/src/Unit/process/NullCoalesceTest.php
@@ -0,0 +1,92 @@
+<?php
+
+namespace Drupal\Tests\migrate\Unit\process;
+
+use Drupal\migrate\MigrateException;
+use Drupal\migrate\Plugin\migrate\process\NullCoalesce;
+
+/**
+ * Tests the null_coalesce process plugin.
+ *
+ * @group migrate
+ *
+ * @coversDefaultClass \Drupal\migrate\Plugin\migrate\process\NullCoalesce
+ */
+class NullCoalesceTest extends MigrateProcessTestCase {
+
+  /**
+   * Tests that an exception is thrown for a non-array value.
+   *
+   * @covers ::transform
+   */
+  public function testExceptionOnInvalidValue() {
+    $this->expectException(MigrateException::class);
+    (new NullCoalesce([], 'null_coalesce', []))->transform('invalid', $this->migrateExecutable, $this->row, 'destinationproperty');
+  }
+
+  /**
+   * Tests null_coalesce.
+   *
+   * @param array $source
+   *   The source value.
+   * @param mixed $expected_result
+   *   The expected result.
+   *
+   * @covers ::transform
+   *
+   * @dataProvider transformDataProvider
+   *
+   * @throws \Drupal\migrate\MigrateException
+   */
+  public function testTransform(array $source, $expected_result) {
+    $plugin = new NullCoalesce([], 'null_coalesce', []);
+    $result = $plugin->transform($source, $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame($expected_result, $result);
+  }
+
+  /**
+   * Provides Data for ::testTransform.
+   */
+  public function transformDataProvider() {
+    return [
+      'all null' => [
+        'source' => [NULL, NULL, NULL],
+        'expected_result' => NULL,
+      ],
+      'false first' => [
+        'source' => [FALSE, NULL, NULL],
+        'expected_result' => FALSE,
+      ],
+      'no null' => [
+        'source' => ['test', 'test2'],
+        'expected_result' => 'test',
+      ],
+      'string first' => [
+        'source' => ['test', NULL, 'test2'],
+        'expected_result' => 'test',
+      ],
+      'empty string' => [
+        'source' => [NULL, '', NULL],
+        'expected_result' => '',
+      ],
+      'array' => [
+        'source' => [NULL, NULL, [1, 2, 3]],
+        'expected_result' => [1, 2, 3],
+      ],
+    ];
+  }
+
+  /**
+   * Tests null_coalesce with default value.
+   *
+   * @covers ::transform
+   */
+  public function testTransformWithDefault() {
+    $plugin = new NullCoalesce(['default_value' => 'default'], 'null_coalesce', []);
+    $result = $plugin->transform([NULL, NULL, 'Test', 'Test 2'], $this->migrateExecutable, $this->row, 'destinationproperty');
+    $this->assertSame('Test', $result);
+
+    $this->assertSame('default', $plugin->transform([NULL, NULL], $this->migrateExecutable, $this->row, 'destinationproperty'));
+  }
+
+}
diff --git a/core/modules/path/migrations/d6_url_alias.yml b/core/modules/path/migrations/d6_url_alias.yml
index 6263ae2a024..747a06805b0 100644
--- a/core/modules/path/migrations/d6_url_alias.yml
+++ b/core/modules/path/migrations/d6_url_alias.yml
@@ -8,7 +8,10 @@ source:
   constants:
     slash: '/'
 process:
-  source:
+  # If you are using this file to build a custom migration consider removing
+  # the id field to allow incremental migrations.
+  id: pid
+  _path:
     plugin: concat
     source:
       - constants/slash
@@ -18,9 +21,7 @@ process:
     source:
       - constants/slash
       - dst
-  langcode:
-    plugin: d6_url_alias_language
-    source: language
+
   node_translation:
     -
       plugin: explode
@@ -35,5 +36,19 @@ process:
     -
       plugin: migration_lookup
       migration: d6_node_translation
+  langcode:
+    -
+      plugin: null_coalesce
+      source:
+        - '@node_translation/1'
+        - language
+    -
+      plugin: default_value
+      default_value: 'und'
+  path:
+    plugin: path_set_translated
+    source:
+      - '@_path'
+      - '@node_translation'
 destination:
-  plugin: url_alias
+  plugin: entity:path_alias
diff --git a/core/modules/path/migrations/d7_url_alias.yml b/core/modules/path/migrations/d7_url_alias.yml
index a4172dcf26c..b49686a7fbf 100644
--- a/core/modules/path/migrations/d7_url_alias.yml
+++ b/core/modules/path/migrations/d7_url_alias.yml
@@ -8,7 +8,10 @@ source:
   constants:
     slash: '/'
 process:
-  source:
+  # If you are using this file to build a custom migration consider removing
+  # the id field to allow incremental migrations.
+  id: pid
+  _path:
     plugin: concat
     source:
       - constants/slash
@@ -18,7 +21,6 @@ process:
     source:
       - constants/slash
       - alias
-  langcode: language
   node_translation:
     -
       plugin: explode
@@ -33,5 +35,15 @@ process:
     -
       plugin: migration_lookup
       migration: d7_node_translation
+  langcode:
+    plugin: null_coalesce
+    source:
+      - '@node_translation/1'
+      - language
+  path:
+    plugin: path_set_translated
+    source:
+      - '@_path'
+      - '@node_translation'
 destination:
-  plugin: url_alias
+  plugin: entity:path_alias
diff --git a/core/modules/path/src/Plugin/migrate/destination/UrlAlias.php b/core/modules/path/src/Plugin/migrate/destination/UrlAlias.php
index 15f5c21a03e..99517c67b32 100644
--- a/core/modules/path/src/Plugin/migrate/destination/UrlAlias.php
+++ b/core/modules/path/src/Plugin/migrate/destination/UrlAlias.php
@@ -2,100 +2,51 @@
 
 namespace Drupal\path\Plugin\migrate\destination;
 
-use Drupal\Core\Path\AliasStorageInterface;
-use Drupal\migrate\Plugin\MigrationInterface;
+use Drupal\migrate\Plugin\migrate\destination\EntityContentBase;
 use Drupal\migrate\Row;
-use Drupal\migrate\Plugin\migrate\destination\DestinationBase;
-use Symfony\Component\DependencyInjection\ContainerInterface;
-use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+
+@trigger_error('UrlAlias is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. Use the entity:path_alias destination instead. See https://www.drupal.org/node/3013865', E_USER_DEPRECATED);
 
 /**
+ * Legacy destination class for non-entity path aliases.
+ *
  * @MigrateDestination(
  *   id = "url_alias"
  * )
+ *
+ * @deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. Use
+ * the entity:path_alias destination instead.
+ *
+ * @see https://www.drupal.org/node/3013865
  */
-class UrlAlias extends DestinationBase implements ContainerFactoryPluginInterface {
-
-  /**
-   * The alias storage service.
-   *
-   * @var \Drupal\Core\Path\AliasStorageInterface
-   */
-  protected $aliasStorage;
-
-  /**
-   * Constructs an entity destination plugin.
-   *
-   * @param array $configuration
-   *   A configuration array containing information about the plugin instance.
-   * @param string $plugin_id
-   *   The plugin_id for the plugin instance.
-   * @param mixed $plugin_definition
-   *   The plugin implementation definition.
-   * @param \Drupal\migrate\Plugin\MigrationInterface $migration
-   *   The migration.
-   * @param \Drupal\Core\Path\AliasStorageInterface $alias_storage
-   *   The alias storage service.
-   */
-  public function __construct(array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration, AliasStorageInterface $alias_storage) {
-    parent::__construct($configuration, $plugin_id, $plugin_definition, $migration);
-    $this->aliasStorage = $alias_storage;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration = NULL) {
-    return new static(
-      $configuration,
-      $plugin_id,
-      $plugin_definition,
-      $migration,
-      $container->get('path.alias_storage')
-    );
-  }
+class UrlAlias extends EntityContentBase {
 
   /**
    * {@inheritdoc}
    */
   public function import(Row $row, array $old_destination_id_values = []) {
-    $source = $row->getDestinationProperty('source');
-    $alias = $row->getDestinationProperty('alias');
-    $langcode = $row->getDestinationProperty('langcode');
-    $pid = $old_destination_id_values ? $old_destination_id_values[0] : NULL;
+    if ($row->getDestinationProperty('source')) {
+      $row->setDestinationProperty('path', $row->getDestinationProperty('source'));
+    }
+    $path = $row->getDestinationProperty('path');
 
     // Check if this alias is for a node and if that node is a translation.
-    if (preg_match('/^\/node\/\d+$/', $source) && $row->hasDestinationProperty('node_translation')) {
+    if (preg_match('/^\/node\/\d+$/', $path) && $row->hasDestinationProperty('node_translation')) {
 
       // Replace the alias source with the translation source path.
       $node_translation = $row->getDestinationProperty('node_translation');
-      $source = '/node/' . $node_translation[0];
-      $langcode = $node_translation[1];
+      $row->setDestinationProperty('path', '/node/' . $node_translation[0]);
+      $row->setDestinationProperty('langcode', $node_translation[1]);
     }
 
-    $path = $this->aliasStorage->save($source, $alias, $langcode, $pid);
-
-    return [$path['pid']];
+    return parent::import($row, $old_destination_id_values);
   }
 
   /**
    * {@inheritdoc}
    */
-  public function getIds() {
-    $ids['pid']['type'] = 'integer';
-    return $ids;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function fields(MigrationInterface $migration = NULL) {
-    return [
-      'pid' => 'The path id',
-      'source' => 'The source path.',
-      'alias' => 'The URL alias.',
-      'langcode' => 'The language code for the URL.',
-    ];
+  protected static function getEntityTypeId($plugin_id) {
+    return 'path_alias';
   }
 
 }
diff --git a/core/modules/path/src/Plugin/migrate/process/PathSetTranslated.php b/core/modules/path/src/Plugin/migrate/process/PathSetTranslated.php
new file mode 100644
index 00000000000..74ed9652d96
--- /dev/null
+++ b/core/modules/path/src/Plugin/migrate/process/PathSetTranslated.php
@@ -0,0 +1,75 @@
+<?php
+
+namespace Drupal\path\Plugin\migrate\process;
+
+use Drupal\migrate\MigrateException;
+use Drupal\migrate\MigrateExecutableInterface;
+use Drupal\migrate\ProcessPluginBase;
+use Drupal\migrate\Row;
+
+/**
+ * A process plugin to update the path of a translated node.
+ *
+ * Available configuration keys:
+ * - source: An array of two values, the first being the original path, and the
+ *   second being an array of the format [nid, langcode] if a translated node
+ *   exists (likely from a migration lookup). Paths not of the format
+ *   '/node/<nid>' will pass through unchanged, as will any inputs with invalid
+ *   or missing translated nodes.
+ *
+ * This plugin will return the correct path for the translated node if the above
+ * conditions are met, and will return the original path otherwise.
+ *
+ * Example:
+ *   node_translation:
+ *   -
+ *     plugin: explode
+ *     source: source
+ *     delimiter: /
+ *   -
+ *     # If the source path has no slashes return a dummy default value.
+ *     plugin: extract
+ *     default: 'INVALID_NID'
+ *     index:
+ *       - 1
+ *   -
+ *     plugin: migration_lookup
+ *     migration: d7_node_translation
+ *   _path:
+ *     plugin: concat
+ *     source:
+ *       - constants/slash
+ *       - source
+ *   path:
+ *     plugin: path_set_translated
+ *     source:
+ *       - '@_path'
+ *       - '@node_translation'
+ *
+ * In the example above, if the node_translation lookup succeeds and the
+ * original path is of the format '/node/<original node nid>', then the new path
+ * will be set to '/node/<translated node nid>'
+ *
+ * @MigrateProcessPlugin(
+ *   id = "path_set_translated"
+ * )
+ */
+class PathSetTranslated extends ProcessPluginBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
+    if (!is_array($value)) {
+      throw new MigrateException("The input value should be an array.");
+    }
+
+    $path = isset($value[0]) ? $value[0] : '';
+    $nid = (is_array($value[1]) && isset($value[1][0])) ? $value[1][0] : FALSE;
+    if (preg_match('/^\/node\/\d+$/', $path) && $nid) {
+      return '/node/' . $nid;
+    }
+    return $path;
+  }
+
+}
diff --git a/core/modules/path/tests/src/Kernel/Migrate/d6/LegacyMigrateUrlAliasTest.php b/core/modules/path/tests/src/Kernel/Migrate/d6/LegacyMigrateUrlAliasTest.php
new file mode 100644
index 00000000000..9570f16b407
--- /dev/null
+++ b/core/modules/path/tests/src/Kernel/Migrate/d6/LegacyMigrateUrlAliasTest.php
@@ -0,0 +1,115 @@
+<?php
+
+namespace Drupal\Tests\path\Kernel\Migrate\d6;
+
+use Drupal\Tests\migrate_drupal\Kernel\d6\MigrateDrupal6TestBase;
+use Drupal\Tests\Traits\ExpectDeprecationTrait;
+
+/**
+ * Tests legacy URL alias migration.
+ *
+ * @group path
+ * @group legacy
+ */
+class LegacyMigrateUrlAliasTest extends MigrateUrlAliasTest {
+  use ExpectDeprecationTrait;
+
+  /**
+   * The legacy stub migration to use.
+   *
+   * @var array
+   */
+  protected $stubMigration = [
+    'id' => 'd6_url_alias',
+    'label' => 'URL aliases',
+    'migration_tags' =>
+      [
+        0 => 'Drupal 6',
+        1 => 'Content',
+      ],
+    'source' =>
+      [
+        'plugin' => 'd6_url_alias',
+        'constants' =>
+          [
+            'slash' => '/',
+          ],
+      ],
+    'process' =>
+      [
+        'source' =>
+          [
+            'plugin' => 'concat',
+            'source' =>
+              [
+                0 => 'constants/slash',
+                1 => 'src',
+              ],
+          ],
+        'alias' =>
+          [
+            'plugin' => 'concat',
+            'source' =>
+              [
+                0 => 'constants/slash',
+                1 => 'dst',
+              ],
+          ],
+        'langcode' =>
+          [
+            'plugin' => 'd6_url_alias_language',
+            'source' => 'language',
+          ],
+        'node_translation' =>
+          [
+            0 =>
+              [
+                'plugin' => 'explode',
+                'source' => 'src',
+                'delimiter' => '/',
+              ],
+            1 =>
+              [
+                'plugin' => 'extract',
+                'default' => 'INVALID_NID',
+                'index' =>
+                  [
+                    0 => 1,
+                  ],
+              ],
+            2 =>
+              [
+                'plugin' => 'migration_lookup',
+                'migration' => 'd6_node_translation',
+              ],
+          ],
+      ],
+    'destination' =>
+      [
+        'plugin' => 'url_alias',
+      ],
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    MigrateDrupal6TestBase::setUp();
+    $this->installEntitySchema('node');
+    $this->installEntitySchema('path_alias');
+    $this->installConfig(['node']);
+    $this->installSchema('node', ['node_access']);
+    $this->migrateUsers(FALSE);
+    $this->migrateFields();
+
+    $this->executeMigrations([
+      'language',
+      'd6_node_settings',
+      'd6_node',
+      'd6_node_translation',
+    ]);
+    $this->executeMigration(\Drupal::service('plugin.manager.migration')->createStubMigration($this->stubMigration));
+    $this->expectDeprecation('UrlAlias is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. Use the entity:path_alias destination instead. See https://www.drupal.org/node/3013865');
+  }
+
+}
diff --git a/core/modules/path/tests/src/Kernel/Migrate/d7/LegacyMigrateUrlAliasTest.php b/core/modules/path/tests/src/Kernel/Migrate/d7/LegacyMigrateUrlAliasTest.php
new file mode 100644
index 00000000000..27eb2021561
--- /dev/null
+++ b/core/modules/path/tests/src/Kernel/Migrate/d7/LegacyMigrateUrlAliasTest.php
@@ -0,0 +1,110 @@
+<?php
+
+namespace Drupal\Tests\path\Kernel\Migrate\d7;
+
+use Drupal\Tests\migrate_drupal\Kernel\d7\MigrateDrupal7TestBase;
+use Drupal\Tests\Traits\ExpectDeprecationTrait;
+
+/**
+ * Tests legacy URL alias migration.
+ *
+ * @group path
+ * @group legacy
+ */
+class LegacyMigrateUrlAliasTest extends MigrateUrlAliasTest {
+  use ExpectDeprecationTrait;
+  /**
+   * The legacy stub migration to use.
+   *
+   * @var array
+   */
+  protected $stubMigration = [
+    'id' => 'd7_url_alias',
+    'label' => 'URL aliases',
+    'migration_tags' =>
+      [
+        0 => 'Drupal 7',
+        1 => 'Content',
+      ],
+    'source' =>
+      [
+        'plugin' => 'd7_url_alias',
+        'constants' =>
+          [
+            'slash' => '/',
+          ],
+      ],
+    'process' =>
+      [
+        'source' =>
+          [
+            'plugin' => 'concat',
+            'source' =>
+              [
+                0 => 'constants/slash',
+                1 => 'source',
+              ],
+          ],
+        'alias' =>
+          [
+            'plugin' => 'concat',
+            'source' =>
+              [
+                0 => 'constants/slash',
+                1 => 'alias',
+              ],
+          ],
+        'langcode' => 'language',
+        'node_translation' =>
+          [
+            0 =>
+              [
+                'plugin' => 'explode',
+                'source' => 'source',
+                'delimiter' => '/',
+              ],
+            1 =>
+              [
+                'plugin' => 'extract',
+                'default' => 'INVALID_NID',
+                'index' =>
+                  [
+                    0 => 1,
+                  ],
+              ],
+            2 =>
+              [
+                'plugin' => 'migration_lookup',
+                'migration' => 'd7_node_translation',
+              ],
+          ],
+      ],
+    'destination' =>
+      [
+        'plugin' => 'url_alias',
+      ],
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    MigrateDrupal7TestBase::setUp();
+
+    $this->installEntitySchema('node');
+    $this->installEntitySchema('path_alias');
+    $this->installConfig('node');
+    $this->installSchema('node', ['node_access']);
+
+    $this->migrateUsers(FALSE);
+    $this->migrateContentTypes();
+    $this->executeMigrations([
+      'language',
+      'd7_node',
+      'd7_node_translation',
+    ]);
+    $this->executeMigration(\Drupal::service('plugin.manager.migration')->createStubMigration($this->stubMigration));
+    $this->expectDeprecation('UrlAlias is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. Use the entity:path_alias destination instead. See https://www.drupal.org/node/3013865');
+  }
+
+}
diff --git a/core/modules/path/tests/src/Unit/migrate/process/PathSetTranslatedTest.php b/core/modules/path/tests/src/Unit/migrate/process/PathSetTranslatedTest.php
new file mode 100644
index 00000000000..1af7e53e4c8
--- /dev/null
+++ b/core/modules/path/tests/src/Unit/migrate/process/PathSetTranslatedTest.php
@@ -0,0 +1,71 @@
+<?php
+
+namespace Drupal\Tests\path\Unit\migrate\process;
+
+use Drupal\path\Plugin\migrate\process\PathSetTranslated;
+use Drupal\Tests\migrate\Unit\process\MigrateProcessTestCase;
+
+/**
+ * Tests the path_set_translated process plugin.
+ *
+ * @group path
+ * @coversDefaultClass \Drupal\path\Plugin\migrate\process\PathSetTranslated
+ */
+class PathSetTranslatedTest extends MigrateProcessTestCase {
+
+  /**
+   * Tests the transform method.
+   *
+   * @param string $path
+   *   The path to test.
+   * @param mixed $node_translation
+   *   The translated node value to test.
+   * @param string $expected_result
+   *   The expected result.
+   *
+   * @covers ::transform
+   *
+   * @dataProvider transformDataProvider
+   */
+  public function testTransform($path, $node_translation, $expected_result) {
+    $plugin = new PathSetTranslated([], 'path_set_translated', []);
+    $this->assertSame($expected_result, $plugin->transform([$path, $node_translation], $this->migrateExecutable, $this->row, 'destination_property'));
+  }
+
+  /**
+   * Provides data for the testTransform method.
+   *
+   * @return array
+   *   The data.
+   */
+  public function transformDataProvider() {
+    return [
+      'non-node-path' => [
+        'path' => '/non-node-path',
+        'node_translation' => [1, 'en'],
+        'expected_result' => '/non-node-path',
+      ],
+      'no_translated_node_1' => [
+        'path' => '/node/1',
+        'node_translation' => 'INVALID_NID',
+        'expected_result' => '/node/1',
+      ],
+      'no_translated_node_2' => [
+        'path' => '/node/1',
+        'node_translation' => NULL,
+        'expected_result' => '/node/1',
+      ],
+      'no_translated_node_3' => [
+        'path' => '/node/1',
+        'node_translation' => FALSE,
+        'expected_result' => '/node/1',
+      ],
+      'valid_transform' => [
+        'path' => '/node/1',
+        'node_translation' => [3, 'en'],
+        'expected_result' => '/node/3',
+      ],
+    ];
+  }
+
+}