Added the tests for symbol from basic
Added the tests for symbol from basic

Signed-off-by: Abinash Meher <99de94af6db6947695684b5525def551c49a9f95@gmail.com>

isuruf/symengine.rb,rajithv/symengine.rb,symengine/symengine.rb,abinashmeher999/symengine.rb,isuruf/symengine.rb,abinashmeher999/symengine.rb,symengine/symengine.rb,abinashmeher999/symengine.rb,rajithv/symengine.rb,isuruf/symengine.rb,rajithv/symengine.rb,symengine/symengine.rb