Update AdminSessionsManagerTest.php

test case Tjitse-E@32a742e thanks to @Tjitse-E - https://github.com/Tjitse-E/

Author: kanhaiya5590

app/code/Magento/Security/Test/Unit/Model/AdminSessionsManagerTest.php

@@ -255,6 +255,48 @@ public function testProcessProlong()
         $this->model->processProlong();
     }
 
+    /**
+     * @return void
+     */
+    public function testUpdatedAtIsNull()
+    {
+        $newUpdatedAt = '2016-01-01 00:00:30';
+        $adminSessionInfoId = 50;
+        $this->authSessionMock->expects($this->any())
+            ->method('getAdminSessionInfoId')
+            ->willReturn($adminSessionInfoId);
+
+        $this->adminSessionInfoFactoryMock->expects($this->any())
+            ->method('create')
+            ->willReturn($this->currentSessionMock);
+
+        $this->currentSessionMock->expects($this->once())
+            ->method('load')
+            ->willReturnSelf();
+
+        $this->currentSessionMock->expects($this->once())
+            ->method('getUpdatedAt')
+            ->willReturn(null);
+
+        $this->authSessionMock->expects($this->once())
+            ->method('getUpdatedAt')
+            ->willReturn(strtotime($newUpdatedAt));
+
+        $this->securityConfigMock->expects($this->once())
+            ->method('getAdminSessionLifetime')
+            ->willReturn(100);
+
+        $this->currentSessionMock->expects($this->never())
+            ->method('setData')
+            ->willReturnSelf();
+
+        $this->currentSessionMock->expects($this->never())
+            ->method('save')
+            ->willReturnSelf();
+
+        $this->model->processProlong();
+    }
+
     /**
      * @return void
      */