Update to Drupal 8.1.2. For more information, see https://www.drupal.org/project/drupal/releases/8.1.2

core/modules/block/tests/src/Kernel/BlockInterfaceTest.php

@@ -99,4 +99,5 @@ class BlockInterfaceTest extends KernelTestBase {
     // testing BlockBase's implementation, not the interface itself.
     $this->assertIdentical($display_block->getMachineNameSuggestion(), 'displaymessage', 'The plugin returned the expected machine name suggestion.');
   }
+
 }

core/modules/block/tests/src/Kernel/Migrate/d7/MigrateBlockTest.php

@@ -16,7 +16,7 @@ class MigrateBlockTest extends MigrateDrupal7TestBase {
  /**
    * {@inheritdoc}
    */
-  static $modules = [
+  public static $modules = [
     'block',
     'views',
     'comment',