1. An information processing system that generates a test case for a web application, the system comprising: a memory; a processing unit in communication with the memory that performs a method comprising: storing at least one resource identifier patterns as an entry in a queue in said memory, wherein said resource identifier patterns comprise one or more parameter-constrained Uniform Resource Locator (URL) patterns that are extracted from a server code of a web application by analyzing said server code; analyzing a client code generated from said server code and finding at least one event sequences matching with said one or more parameter-constrained Uniform Resource Locator (URL) patterns; and fetching a client state established from said client code, executing said event sequences on said client state, and generating a test case, wherein said test case comprises a URL including specific values matching with a parameter-constrained URL pattern corresponding to said event sequence and generated as an execution result of said event sequence, marking or deleting a corresponding matching entry of the parameter-constrained Uniform Resource Locator (URL) pattern from said queue, and repeating said analyzing, finding, fetching, executing, test case generating and the marking or deleting steps until all entries in the queue are marked or deleted.