only in patch2:
unchanged:
--- /dev/null
+++ b/core/modules/taxonomy/tests/src/Kernel/Plugin/migrate/source/d7/TermTranslationTest.php
@@ -0,0 +1,351 @@
+<?php
+
+namespace Drupal\Tests\taxonomy\Kernel\Plugin\migrate\source\d7;
+
+/**
+ * Tests D7 i18n term localized source plugin.
+ *
+ * @covers \Drupal\taxonomy\Plugin\migrate\source\d7\TermTranslation
+ * @group taxonomy
+ */
+class TermTranslationTest extends TermTest {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = ['taxonomy', 'migrate_drupal'];
+
+  /**
+   * {@inheritdoc}
+   */
+  public function providerSource() {
+    $tests = [];
+
+    // Ignore i18_modes 0 and 1, get i18n_mode 4.
+    $tests[0]['source_data']['taxonomy_term_data'] = [
+      [
+        'tid' => 1,
+        'vid' => 5,
+        'name' => 'fr - name 1',
+        'description' => 'desc 1',
+        'weight' => 0,
+        'is_container' => FALSE,
+        'language' => 'fr',
+        'i18n_tsid' => '1',
+      ],
+      [
+        'tid' => 2,
+        'vid' => 5,
+        'name' => 'name 2',
+        'description' => 'desc 2',
+        'weight' => 0,
+        'is_container' => TRUE,
+        'language' => 'en',
+        'i18n_tsid' => '1',
+      ],
+      [
+        'tid' => 3,
+        'vid' => 6,
+        'name' => 'name 3',
+        'description' => 'desc 3',
+        'weight' => 0,
+        'is_container' => FALSE,
+        'language' => '',
+        'i18n_tsid' => '',
+      ],
+      [
+        'tid' => 4,
+        'vid' => 5,
+        'name' => 'is - name 4',
+        'description' => 'desc 4',
+        'weight' => 1,
+        'is_container' => FALSE,
+        'language' => 'is',
+        'i18n_tsid' => '1',
+      ],
+      [
+        'tid' => 5,
+        'vid' => 6,
+        'name' => 'name 5',
+        'description' => 'desc 5',
+        'weight' => 1,
+        'is_container' => FALSE,
+        'language' => '',
+        'i18n_tsid' => '',
+      ],
+      [
+        'tid' => 6,
+        'vid' => 6,
+        'name' => 'name 6',
+        'description' => 'desc 6',
+        'weight' => 0,
+        'is_container' => TRUE,
+        'language' => '',
+        'i18n_tsid' => '',
+      ],
+      [
+        'tid' => 7,
+        'vid' => 7,
+        'name' => 'is - captains',
+        'description' => 'desc 7',
+        'weight' => 0,
+        'is_container' => TRUE,
+        'language' => 'is',
+        'i18n_tsid' => '',
+      ],
+    ];
+    $tests[0]['source_data']['taxonomy_term_hierarchy'] = [
+      [
+        'tid' => 1,
+        'parent' => 0,
+      ],
+      [
+        'tid' => 2,
+        'parent' => 0,
+      ],
+      [
+        'tid' => 3,
+        'parent' => 0,
+      ],
+      [
+        'tid' => 4,
+        'parent' => 1,
+      ],
+      [
+        'tid' => 5,
+        'parent' => 2,
+      ],
+      [
+        'tid' => 6,
+        'parent' => 3,
+      ],
+      [
+        'tid' => 6,
+        'parent' => 2,
+      ],
+      [
+        'tid' => 7,
+        'parent' => 0,
+      ],
+    ];
+
+    $tests[0]['source_data']['taxonomy_vocabulary'] = [
+      [
+        'vid' => 3,
+        'machine_name' => 'foo',
+        'language' => 'und',
+        'i18n_mode' => '0',
+      ],
+      [
+        'vid' => 5,
+        'machine_name' => 'tags',
+        'language' => 'und',
+        'i18n_mode' => '4',
+      ],
+      [
+        'vid' => 6,
+        'machine_name' => 'categories',
+        'language' => 'is',
+        'i18n_mode' => '1',
+      ],
+    ];
+
+    $tests[0]['source_data']['field_config'] = [
+      [
+        'id' => '3',
+        'translatable' => '0',
+      ],
+      [
+        'id' => '4',
+        'translatable' => '1',
+      ],
+      [
+        'id' => '5',
+        'translatable' => '1',
+      ],
+    ];
+    $tests[0]['source_data']['field_config_instance'] = [
+      [
+        'id' => '2',
+        'field_id' => 3,
+        'field_name' => 'field_term_field',
+        'entity_type' => 'taxonomy_term',
+        'bundle' => 'tags',
+        'data' => 'a:0:{}',
+        'deleted' => 0,
+      ],
+      [
+        'id' => '3',
+        'field_id' => 3,
+        'field_name' => 'field_term_field',
+        'entity_type' => 'taxonomy_term',
+        'bundle' => 'categories',
+        'data' => 'a:0:{}',
+        'deleted' => 0,
+      ],
+      [
+        'id' => '4',
+        'field_id' => '4',
+        'field_name' => 'name_field',
+        'entity_type' => 'taxonomy_term',
+        'bundle' => 'tags',
+        'data' => 'a:0:{}',
+        'deleted' => '0',
+      ],
+      [
+        'id' => '5',
+        'field_id' => '5',
+        'field_name' => 'description_field',
+        'entity_type' => 'taxonomy_term',
+        'bundle' => 'tags',
+        'data' => 'a:0:{}',
+        'deleted' => '0',
+      ],
+    ];
+    $tests[0]['source_data']['field_data_field_term_field'] = [
+      [
+        'entity_type' => 'taxonomy_term',
+        'bundle' => 'tags',
+        'deleted' => 0,
+        'entity_id' => 1,
+        'delta' => 0,
+      ],
+      [
+        'entity_type' => 'taxonomy_term',
+        'bundle' => 'categories',
+        'deleted' => 0,
+        'entity_id' => 1,
+        'delta' => 0,
+      ],
+    ];
+    $tests[0]['source_data']['field_data_name_field'] = [
+      [
+        'entity_type' => 'taxonomy_term',
+        'bundle' => 'tags',
+        'deleted' => '0',
+        'entity_id' => '1',
+        'revision_id' => '1',
+        'language' => 'und',
+        'delta' => '0',
+        'name_field_value' => 'fr - name 1',
+        'name_field_format' => NULL,
+      ],
+      [
+        'entity_type' => 'taxonomy_term',
+        'bundle' => 'tags',
+        'deleted' => '0',
+        'entity_id' => '4',
+        'revision_id' => '4',
+        'language' => 'und',
+        'delta' => '0',
+        'name_field_value' => 'is - name 4',
+        'name_field_format' => NULL,
+      ],
+    ];
+    $tests[0]['source_data']['field_data_description_field'] = [
+      [
+        'entity_type' => 'taxonomy_term',
+        'bundle' => 'tags',
+        'deleted' => '0',
+        'entity_id' => '1',
+        'revision_id' => '1',
+        'language' => 'und',
+        'delta' => '0',
+        'description_field_value' => 'desc 1',
+        'description_field_format' => NULL,
+      ],
+      [
+        'entity_type' => 'taxonomy_term',
+        'bundle' => 'tags',
+        'deleted' => '0',
+        'entity_id' => '4',
+        'revision_id' => '4',
+        'language' => 'und',
+        'delta' => '0',
+        'description_field_value' => 'desc 4',
+        'description_field_format' => NULL,
+      ],
+    ];
+
+    // The expected results.
+    $tests[0]['expected_data'] = [
+      [
+        'tid' => 1,
+        'vid' => 5,
+        'name' => 'fr - name 1',
+        'description' => 'desc 1',
+        'weight' => 0,
+        'is_container' => '',
+        'language' => 'fr',
+        'i18n_tsid' => '1',
+        'machine_name' => 'tags',
+        'i18n_mode' => '4',
+        'td_language' => 'fr',
+        'tv_i18n_mode' => '4',
+      ],
+      [
+        'tid' => 2,
+        'vid' => 5,
+        'name' => 'name 2',
+        'description' => 'desc 2',
+        'weight' => 0,
+        'is_container' => '',
+        'language' => 'en',
+        'i18n_tsid' => '1',
+        'machine_name' => 'tags',
+        'i18n_mode' => '4',
+        'td_language' => 'en',
+        'tv_i18n_mode' => '4',
+      ],
+      [
+        'tid' => 4,
+        'vid' => 5,
+        'name' => 'is - name 4',
+        'description' => 'desc 4',
+        'weight' => 1,
+        'is_container' => '',
+        'language' => 'is',
+        'i18n_tsid' => '1',
+        'machine_name' => 'tags',
+        'i18n_mode' => '4',
+        'td_language' => 'is',
+        'tv_i18n_mode' => '4',
+      ],
+    ];
+
+    $tests[0]['expected_count'] = NULL;
+    // Get translations for the tags bundle.
+    $tests[0]['configuration']['bundle'] = ['tags'];
+
+    // Ignore i18_modes 0. get i18n_mode 2 and 4.
+    $tests[1] = $tests[0];
+    // Change a vocabulary to using fixed translation.
+    $tests[1]['source_data']['taxonomy_vocabulary'][2] = [
+      'vid' => 7,
+      'machine_name' => 'categories',
+      'language' => 'is',
+      'i18n_mode' => '2',
+    ];
+
+    // Add the term with fixed translation.
+    $tests[1]['expected_data'][] = [
+      'tid' => 7,
+      'vid' => 7,
+      'name' => 'is - captains',
+      'description' => 'desc 7',
+      'weight' => 0,
+      'is_container' => '',
+      'language' => 'is',
+      'i18n_tsid' => '',
+      'machine_name' => 'categories',
+      'i18n_mode' => '2',
+      'td_language' => 'is',
+      'tv_i18n_mode' => '2',
+    ];
+
+    $tests[1]['expected_count'] = NULL;
+    $tests[1]['configuration']['bundle'] = NULL;
+    return $tests;
+  }
+
+}