diff --git a/core/modules/file/tests/src/Unit/Plugin/migrate/process/d6/FileUriTest.php b/core/modules/file/tests/src/Unit/Plugin/migrate/process/d6/FileUriTest.php
index bfbdc32..78d5082 100644
--- a/core/modules/file/tests/src/Unit/Plugin/migrate/process/d6/FileUriTest.php
+++ b/core/modules/file/tests/src/Unit/Plugin/migrate/process/d6/FileUriTest.php
@@ -70,7 +70,7 @@ public function testTemporary() {
 
   protected function doTransform(array $value) {
     $executable = new MigrateExecutable($this->getMigration(), new MigrateMessage());
-    $row = new Row([], []);
+    $row = new Row();
 
     return (new FileUri([], 'file_uri', []))
       ->transform($value, $executable, $row, 'foobaz');
diff --git a/core/modules/filter/tests/src/Kernel/Plugin/migrate/process/FilterIdTest.php b/core/modules/filter/tests/src/Kernel/Plugin/migrate/process/FilterIdTest.php
index 39e4037..1206734 100644
--- a/core/modules/filter/tests/src/Kernel/Plugin/migrate/process/FilterIdTest.php
+++ b/core/modules/filter/tests/src/Kernel/Plugin/migrate/process/FilterIdTest.php
@@ -71,7 +71,7 @@ public function test($value, $expected_value, $invalid_id = NULL) {
         );
     }
 
-    $row = new Row([], []);
+    $row = new Row();
     $output_value = $plugin->transform($value, $this->executable, $row, 'foo');
 
     $this->assertSame($expected_value, $output_value);
diff --git a/core/modules/migrate/src/Row.php b/core/modules/migrate/src/Row.php
index 94cb8b2..ea70acd 100644
--- a/core/modules/migrate/src/Row.php
+++ b/core/modules/migrate/src/Row.php
@@ -91,7 +91,7 @@ class Row {
    * @throws \InvalidArgumentException
    *   Thrown when a source ID property does not exist.
    */
-  public function __construct(array $values, array $source_ids, $is_stub = FALSE) {
+  public function __construct(array $values = [], array $source_ids = [], $is_stub = FALSE) {
     $this->source = $values;
     $this->sourceIds = $source_ids;
     $this->isStub = $is_stub;
diff --git a/core/modules/migrate/tests/src/Kernel/MigrateEntityContentBaseTest.php b/core/modules/migrate/tests/src/Kernel/MigrateEntityContentBaseTest.php
index 352b660..54ded16 100644
--- a/core/modules/migrate/tests/src/Kernel/MigrateEntityContentBaseTest.php
+++ b/core/modules/migrate/tests/src/Kernel/MigrateEntityContentBaseTest.php
@@ -123,7 +123,7 @@ public function testTranslated() {
 
     // Import some rows.
     foreach ($destination_rows as $idx => $destination_row) {
-      $row = new Row([], []);
+      $row = new Row();
       foreach ($destination_row as $key => $value) {
         $row->setDestinationProperty($key, $value);
       }
diff --git a/core/modules/migrate/tests/src/Kernel/process/CopyFileTest.php b/core/modules/migrate/tests/src/Kernel/process/CopyFileTest.php
index 53ada1d..42c3f04 100644
--- a/core/modules/migrate/tests/src/Kernel/process/CopyFileTest.php
+++ b/core/modules/migrate/tests/src/Kernel/process/CopyFileTest.php
@@ -172,7 +172,7 @@ public function testRenameFile() {
   protected function doImport($source_path, $destination_path, $configuration = []) {
     $plugin = FileCopy::create($this->container, $configuration, 'file_copy', []);
     $executable = $this->prophesize(MigrateExecutableInterface::class)->reveal();
-    $row = new Row([], []);
+    $row = new Row();
 
     $result = $plugin->transform([$source_path, $destination_path], $executable, $row, 'foobaz');
 
diff --git a/core/modules/migrate/tests/src/Unit/MigrateExecutableTest.php b/core/modules/migrate/tests/src/Unit/MigrateExecutableTest.php
index 84c97f2..60809a9 100644
--- a/core/modules/migrate/tests/src/Unit/MigrateExecutableTest.php
+++ b/core/modules/migrate/tests/src/Unit/MigrateExecutableTest.php
@@ -398,7 +398,7 @@ public function testProcessRow() {
       ->method('getProcessPlugins')
       ->with(NULL)
       ->will($this->returnValue($plugins));
-    $row = new Row(array(), array());
+    $row = new Row();
     $this->executable->processRow($row);
     foreach ($expected as $key => $value) {
       $this->assertSame($row->getDestinationProperty($key), $value);
@@ -414,7 +414,7 @@ public function testProcessRowEmptyPipeline() {
       ->method('getProcessPlugins')
       ->with(NULL)
       ->will($this->returnValue(array('test' => array())));
-    $row = new Row(array(), array());
+    $row = new Row();
     $this->executable->processRow($row);
     $this->assertSame($row->getDestination(), array());
   }
diff --git a/core/modules/migrate/tests/src/Unit/MigrateSourceTest.php b/core/modules/migrate/tests/src/Unit/MigrateSourceTest.php
index db8313e..4a462e9 100644
--- a/core/modules/migrate/tests/src/Unit/MigrateSourceTest.php
+++ b/core/modules/migrate/tests/src/Unit/MigrateSourceTest.php
@@ -286,7 +286,7 @@ public function testPrepareRow() {
     // Get a new migration with an id.
     $migration = $this->getMigration();
     $source = new StubSourcePlugin([], '', [], $migration);
-    $row = new Row([], []);
+    $row = new Row();
 
     $module_handler = $this->prophesize(ModuleHandlerInterface::class);
     $module_handler->invokeAll('migrate_prepare_row', [$row, $source, $migration])
@@ -328,7 +328,7 @@ public function testPrepareRowGlobalPrepareSkip() {
 
     $migration = $this->getMigration();
     $source = new StubSourcePlugin([], '', [], $migration);
-    $row = new Row([], []);
+    $row = new Row();
 
     $module_handler = $this->prophesize(ModuleHandlerInterface::class);
     // Return a failure from a prepare row hook.
@@ -357,7 +357,7 @@ public function testPrepareRowMigratePrepareSkip() {
 
     $migration = $this->getMigration();
     $source = new StubSourcePlugin([], '', [], $migration);
-    $row = new Row([], []);
+    $row = new Row();
 
     $module_handler = $this->prophesize(ModuleHandlerInterface::class);
     // Return a failure from a prepare row hook.
@@ -386,7 +386,7 @@ public function testPrepareRowPrepareException() {
 
     $migration = $this->getMigration();
     $source = new StubSourcePlugin([], '', [], $migration);
-    $row = new Row([], []);
+    $row = new Row();
 
     $module_handler = $this->prophesize(ModuleHandlerInterface::class);
     // Return a failure from a prepare row hook.
diff --git a/core/modules/migrate/tests/src/Unit/Plugin/migrate/destination/EntityContentBaseTest.php b/core/modules/migrate/tests/src/Unit/Plugin/migrate/destination/EntityContentBaseTest.php
index 33aec58..c9b3d11 100644
--- a/core/modules/migrate/tests/src/Unit/Plugin/migrate/destination/EntityContentBaseTest.php
+++ b/core/modules/migrate/tests/src/Unit/Plugin/migrate/destination/EntityContentBaseTest.php
@@ -74,7 +74,7 @@ public function testImport() {
       ->willReturn(5);
     $destination->setEntity($entity->reveal());
     // Ensure the id is saved entity id is returned from import.
-    $this->assertEquals([5], $destination->import(new Row([], [])));
+    $this->assertEquals([5], $destination->import(new Row()));
     // Assert that import set the rollback action.
     $this->assertEquals(MigrateIdMapInterface::ROLLBACK_DELETE, $destination->rollbackAction());
   }
@@ -95,7 +95,7 @@ public function testImportEntityLoadFailure() {
       $this->entityManager->reveal(),
       $this->prophesize(FieldTypePluginManagerInterface::class)->reveal());
     $destination->setEntity(FALSE);
-    $destination->import(new Row([], []));
+    $destination->import(new Row);
   }
 
   /**
diff --git a/core/modules/migrate/tests/src/Unit/RowTest.php b/core/modules/migrate/tests/src/Unit/RowTest.php
index 96c27ea..ec04f82 100644
--- a/core/modules/migrate/tests/src/Unit/RowTest.php
+++ b/core/modules/migrate/tests/src/Unit/RowTest.php
@@ -49,7 +49,7 @@ class RowTest extends UnitTestCase {
    * Tests object creation: empty.
    */
   public function testRowWithoutData() {
-    $row = new Row(array(), array());
+    $row = new Row();
     $this->assertSame(array(), $row->getSource(), 'Empty row');
   }
 
diff --git a/core/modules/migrate/tests/src/Unit/destination/EntityRevisionTest.php b/core/modules/migrate/tests/src/Unit/destination/EntityRevisionTest.php
index f1e288e..1886914 100644
--- a/core/modules/migrate/tests/src/Unit/destination/EntityRevisionTest.php
+++ b/core/modules/migrate/tests/src/Unit/destination/EntityRevisionTest.php
@@ -67,7 +67,7 @@ public function testGetEntityDestinationValues() {
     $this->storage->loadRevision(12)
       ->shouldBeCalled()
       ->willReturn($entity->reveal());
-    $row = new Row([], []);
+    $row = new Row();
     $this->assertEquals($entity->reveal(), $destination->getEntity($row, [12, 13]));
   }
 
diff --git a/core/modules/migrate/tests/src/Unit/destination/PerComponentEntityDisplayTest.php b/core/modules/migrate/tests/src/Unit/destination/PerComponentEntityDisplayTest.php
index 1be14bc..4782dc0 100644
--- a/core/modules/migrate/tests/src/Unit/destination/PerComponentEntityDisplayTest.php
+++ b/core/modules/migrate/tests/src/Unit/destination/PerComponentEntityDisplayTest.php
@@ -29,7 +29,7 @@ public function testImport() {
       'field_name' => 'field_name_test',
       'options' => array('test setting'),
     );
-    $row = new Row(array(), array());
+    $row = new Row();
     foreach ($values as $key => $value) {
       $row->setDestinationProperty($key, $value);
     }
diff --git a/core/modules/migrate/tests/src/Unit/destination/PerComponentEntityFormDisplayTest.php b/core/modules/migrate/tests/src/Unit/destination/PerComponentEntityFormDisplayTest.php
index 18df362..50cdbf6 100644
--- a/core/modules/migrate/tests/src/Unit/destination/PerComponentEntityFormDisplayTest.php
+++ b/core/modules/migrate/tests/src/Unit/destination/PerComponentEntityFormDisplayTest.php
@@ -29,7 +29,7 @@ public function testImport() {
       'field_name' => 'field_name_test',
       'options' => array('test setting'),
     );
-    $row = new Row(array(), array());
+    $row = new Row();
     foreach ($values as $key => $value) {
       $row->setDestinationProperty($key, $value);
     }
diff --git a/core/modules/migrate/tests/src/Unit/process/IteratorTest.php b/core/modules/migrate/tests/src/Unit/process/IteratorTest.php
index 7c731a2..cdffac0 100644
--- a/core/modules/migrate/tests/src/Unit/process/IteratorTest.php
+++ b/core/modules/migrate/tests/src/Unit/process/IteratorTest.php
@@ -67,7 +67,7 @@ public function testIterator() {
       ),
     );
     // This is not used but the interface requires it, so create an empty row.
-    $row = new Row(array(), array());
+    $row = new Row();
 
     // After transformation, check to make sure that source_foo and source_id's
     // values ended up in the proper destinations, and that the value of the
diff --git a/core/modules/migrate/tests/src/Unit/process/UrlEncodeTest.php b/core/modules/migrate/tests/src/Unit/process/UrlEncodeTest.php
index 539858f..78d89a1 100644
--- a/core/modules/migrate/tests/src/Unit/process/UrlEncodeTest.php
+++ b/core/modules/migrate/tests/src/Unit/process/UrlEncodeTest.php
@@ -57,7 +57,7 @@ public function testUrls($input, $output) {
    */
   protected function doTransform($value) {
     $executable = new MigrateExecutable($this->getMigration(), new MigrateMessage());
-    $row = new Row([], []);
+    $row = new Row();
 
     return (new UrlEncode([], 'urlencode', []))
       ->transform($value, $executable, $row, 'foobaz');