only in patch2:
unchanged:
--- a/core/modules/migrate/tests/src/Unit/RowTest.php
+++ b/core/modules/migrate/tests/src/Unit/RowTest.php
@@ -197,6 +197,39 @@ public function testSourceIdValues() {
   }
 
   /**
+   * Tests the multiple source IDs.
+   */
+  public function testMultipleSourceIdValues() {
+    // Set values in same order as ids.
+    $multi_source_ids = $this->testSourceIds + array(
+      'vid' => 'Node revision',
+      'type' => 'Node type',
+      'langcode' => 'Node language',
+    );
+    $multi_source_ids_values = $this->testValues + array(
+      'vid' => 1,
+      'type' => 'page',
+      'langcode' => 'en',
+    );
+    $row = new Row($multi_source_ids_values, $multi_source_ids);
+    $this->assertSame(array_keys($multi_source_ids), array_keys($row->getSourceIdValues()));
+
+    // Set values in different order.
+    $multi_source_ids = $this->testSourceIds + array(
+        'vid' => 'Node revision',
+        'type' => 'Node type',
+        'langcode' => 'Node language',
+      );
+    $multi_source_ids_values = $this->testValues + array(
+        'langcode' => 'en',
+        'type' => 'page',
+        'vid' => 1,
+      );
+    $row = new Row($multi_source_ids_values, $multi_source_ids);
+    $this->assertSame(array_keys($multi_source_ids), array_keys($row->getSourceIdValues()));
+  }
+
+  /**
    * Tests getting the source property.
    *
    * @covers ::getSourceProperty