only in patch2:
unchanged:
--- /dev/null
+++ b/core/modules/system/lib/Drupal/system/Tests/Upgrade/StateSystemUpgradePathTest.php
@@ -0,0 +1,59 @@
+<?php
+
+/**
+ * @file
+ * Definition of Drupal\system\Tests\Upgrade\StateSystemUpgradePathTest.
+ */
+
+namespace Drupal\system\Tests\Upgrade;
+
+/**
+ * Tests upgrade of system variables.
+ */
+class StateSystemUpgradePathTest extends UpgradePathTestBase {
+  public static function getInfo() {
+    return array(
+      'name' => 'State system upgrade test',
+      'description' => 'Tests upgrade of system variables to the state system.',
+      'group' => 'Upgrade path',
+    );
+  }
+
+  public function setUp() {
+    $this->databaseDumpFiles = array(
+      drupal_get_path('module', 'system') . '/tests/upgrade/drupal-7.bare.standard_all.database.php.gz',
+      drupal_get_path('module', 'system') . '/tests/upgrade/drupal-7.state.system.database.php',
+    );
+    parent::setUp();
+  }
+
+  /**
+   * Tests upgrade of system variables to state system.
+   */
+  public function testSystemVariableUpgrade() {
+    $this->assertTrue($this->performUpgrade(), 'The upgrade was completed successfully.');
+
+    $expected_state = array();
+
+    $expected_state['system.install_time'] = array(
+      'value' => 1304208000,
+      'variable_name' => 'install_time',
+    );
+    $expected_state['system.install_task'] = array(
+      'value' => 'done',
+      'variable_name' => 'install_task',
+    );
+    $expected_state['system.path_alias_whitelist'] = array(
+      'value' => array(
+
+      ),
+      'variable_name' => 'path_alias_whitelist',
+    );
+
+    foreach ($expected_state as $name => $data) {
+      $this->assertIdentical(state()->get($name), $data['value']);
+      $deleted = !db_query('SELECT value FROM {variable} WHERE name = :name', array(':name' => $data['variable_name']))->fetchField();
+      $this->assertTrue($deleted, format_string('Variable !name has been deleted.', array('!name' => $data['variable_name'])));
+    }
+  }
+}
only in patch2:
unchanged:
--- /dev/null
+++ b/core/modules/system/tests/upgrade/drupal-7.state.system.database.php
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * @file
+ * Database additions for state system upgrade tests.
+ *
+ * This dump only contains data and schema components relevant for system
+ * functionality. The drupal-7.filled.bare.php file is imported before
+ * this dump, so the two form the database structure expected in tests
+ * altogether.
+ */
+
+// Update system settings to known values.
+db_merge('variable')
+  ->key(array('name' => 'install_time'))->fields(array('value' => serialize(1304208000)))
+  ->execute();
+
+// Add non-default system settings.