Software reliability testing comprises the analyzing software's capability to perform tasks, specified environmental circumstances, intended for a specific time interim. Reliability testing aids to uncover numerous problems in design and functional aspects of software. This paper considers mainly the two aspects i.e. testing time plus testing coverage. Testing time evaluates the testing interim requires to test specific module. And testing coverage encompasses the quantity of tests exercised by the test batch or set. By considering these two aspects the authors try to assess the reliability of software with specific circumstances.