diff -u b/core/modules/field/tests/src/Kernel/Migrate/d6/MigrateFieldTest.php b/core/modules/field/tests/src/Kernel/Migrate/d6/MigrateFieldTest.php
--- b/core/modules/field/tests/src/Kernel/Migrate/d6/MigrateFieldTest.php
+++ b/core/modules/field/tests/src/Kernel/Migrate/d6/MigrateFieldTest.php
@@ -60,11 +60,11 @@
 
     // Date fields.
     $field_storage = FieldStorageConfig::load('node.field_test_datetime');
-    $this->assertIdentical("datetime", $field_storage->getType(), t('Field type is @fieldtype. It should be datetime.', array('@fieldtype' => $field_storage->getType())));
+    $this->assertSame("datetime", $field_storage->getType(), t('Field type is @fieldtype. It should be datetime.', array('@fieldtype' => $field_storage->getType())));
     $field_storage = FieldStorageConfig::load('node.field_test_datestamp');
-    $this->assertIdentical("datetime", $field_storage->getType(), t('Field type is @fieldtype. It should be datetime.', array('@fieldtype' => $field_storage->getType())));
+    $this->assertSame("datetime", $field_storage->getType(), t('Field type is @fieldtype. It should be datetime.', array('@fieldtype' => $field_storage->getType())));
     $field_storage = FieldStorageConfig::load('node.field_test_date');
-    $this->assertIdentical("datetime", $field_storage->getType(), t('Field type is @fieldtype. It should be datetime.', array('@fieldtype' => $field_storage->getType())));
+    $this->assertSame("datetime", $field_storage->getType(), t('Field type is @fieldtype. It should be datetime.', array('@fieldtype' => $field_storage->getType())));
 
     // Decimal field with radio buttons.
     $field_storage = FieldStorageConfig::load('node.field_test_decimal_radio_buttons');
diff -u b/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeTest.php b/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeTest.php
--- b/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeTest.php
+++ b/core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeTest.php
@@ -65,9 +65,9 @@
     $this->assertIdentical('1', $node->field_test_identical2->value, 'Integer value is correct');
     $this->assertIdentical('This is a field with exclude unset.', $node->field_test_exclude_unset->value, 'Field with exclude unset is correct.');
 
-    $this->assertSame('2013-01-02T04:05:00', $node->field_test_date->value,'Date field with text widget is correct');
-    $this->assertSame('1391357160', $node->field_test_datestamp->value,'Date field with text widget is correct');
-    $this->assertSame('2015-03-04 06:07:00', $node->field_test_datetime->value,'Date field with text widget is correct');
+    $this->assertSame('2013-01-02T04:05:00', $node->field_test_date->value, 'Date field with text widget is correct');
+    $this->assertSame('1391357160', $node->field_test_datestamp->value, 'Date field with text widget is correct');
+    $this->assertSame('2015-03-04 06:07:00', $node->field_test_datetime->value, 'Date field with text widget is correct');
 
     // Test that link fields are migrated.
     $this->assertIdentical('https://www.drupal.org/project/drupal', $node->field_test_link->uri);