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Regression testing is used to re-validate modified program and provide confidence that changes does not harm the behavior of the existing code. Test suites grows in size as software evolve, a simple approach of regression testing is re-test all approach in which all the pre-existing test suites are executed on the code but it is too expensive and increase the cost of testing activity. Different problems have been involved with regression testing, e.g. test suites minimization problem, test selection problem, coverage identification problem, test case execution problem, test case maintenance...

Photovoltaic cells has been fabricated using iodine-doped nonconjugated conductive polymers, poly( -pinene) and cis-polyisoprene. Quadratic electro-optic modulation has been measured in the doped film of cis-polyisoprene at 633nm wavelength. Guided wave electro-optic effect has been reported for the first time using iodine doped cis-polyisoprene at 633nm. The throughput of the waveguide was 5% involving iodine doped nonconjugated conductive polymer. The modulation depth observed for this waveguide was 1% for an applied field of 0.3 V/ m. These initial results look very promising."