Update AdminSessionInfoTest.php

unit test case added - kanhaiya5590@32a742e

Author: kanhaiya5590

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

@@ -127,6 +127,26 @@ public function dataProviderSessionLifetime()
         ];
     }
 
+    /**
+     * @return void
+     */
+    public function testSessionExpiredWhenUpdatedAtIsNull()
+    {
+        $timestamp = time();
+        $sessionLifetime = '1';
+
+        $this->securityConfigMock->expects($this->once())
+            ->method('getAdminSessionLifetime')
+            ->willReturn($sessionLifetime);
+
+        $this->dateTimeMock->expects($this->once())
+            ->method('gmtTimestamp')
+            ->willReturn($timestamp);
+
+        $this->model->setUpdatedAt(null);
+        $this->assertTrue($this->model->isSessionExpired());
+    }
+    
     /**
      * @return void
      */