Added 3 test cases for defects.

<h2>Added Test Cases</h2>
http://adsk-oss.myjetbrains.com/youtrack/issue/MAGN-3212
http://adsk-oss.myjetbrains.com/youtrack/issue/MAGN-3850 
http://adsk-oss.myjetbrains.com/youtrack/issue/MAGN-3599