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Abstract In this research work, we have used genetic algorithm an artificial intelligence technique for automatic generation of test data for integer in case of path testing and for automatic generation of test cases. In case of small problems paths can be easily seen and we can manually select the target path, but in case of large complex problems where control flow graph of a problem is very large like control flow graph of www.irctc.com will be very large and it is very difficult to generate all the paths manually , as there are many paths in the graph we might miss some path, so to generate all the paths automatically, we have used one swarm intelligence technique called intelligent water drop algorithm, which is a graph based algorithm, which select the paths on the basis of probability and generate all the paths in the graph. With an assumption that, most feasible paths are first generated as compare to infeasible paths if present