Update to Drupal 8.2.0. For more information, see https://www.drupal.org/project/drupal/releases/8.2.0

core/modules/contact/tests/drupal-7.contact.database.php

@@ -23,11 +23,11 @@ db_insert('contact')->fields(array(
   'weight',
   'selected'
 ))
-->values(array(
+  ->values(array(
   'category' => 'Upgrade test',
   'recipients' => 'test1@example.com,test2@example.com',
   'reply' => 'Test reply',
   'weight' => 1,
   'selected' => 1,
 ))
-->execute();
+  ->execute();

core/modules/contact/tests/modules/contact_test/config/install/contact.form.feedback.yml

@@ -5,3 +5,5 @@ reply: ''
 weight: 0
 status: true
 langcode: en
+message: 'Your message has been sent.'
+redirect: ''

core/modules/contact/tests/modules/contact_test_views/test_views/views.view.test_contact_link.yml

@@ -111,7 +111,7 @@ display:
           entity_type: user
       filters:
         status:
-          value: true
+          value: '1'
           table: users_field_data
           field: status
           id: status

core/modules/contact/tests/src/Unit/MailHandlerTest.php

@@ -299,7 +299,7 @@ class MailHandlerTest extends UnitTestCase {
       ->method('getEmail')
       ->willReturn($mail_address);
     $sender->expects($this->any())
-      ->method('getUsername')
+      ->method('getDisplayName')
       ->willReturn('user');
     // User ID 1 has special implications, use 3 instead.
     $sender->expects($this->any())
@@ -369,7 +369,7 @@ class MailHandlerTest extends UnitTestCase {
       ->method('getEmail')
       ->willReturn('user2@drupal.org');
     $recipient->expects($this->once())
-      ->method('getUsername')
+      ->method('getDisplayName')
       ->willReturn('user2');
     $recipient->expects($this->once())
       ->method('getPreferredLangcode')