Good and Bad State Graphs in Software Testing Methodologies

A good or bad state graph is basically biased by the kind of state graphs that are likely to be utilized in the context of a software test design

Properties of good state graph

The total number of states is equal to the product of the possibilities of the factors that make up the stat

For every state and input, there is exactly one transition specified to exact one, possibly the same state

For every transition, one output action is specified. The output can be unimportant or does something sensible

For every state, there is a sequence of inputs that will drive the system back to the same state

In genereal, a state graph should have at least two different input codes

Two state graphs with same state, inputs and transitions can have different outputs. But, form the point of view of a state-testing, they might be identical

Bad State graphs contain inreachble states. Possiblity of reaching every state from every other state is zero, Also, it is not possible to reach start state form itself

The given image shows the example of improper state graphs

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About Data Sciences by Venu

Hi, My name is Venugopala Chary and I'm Currently working as Associate Professor in Reputed Engineerng College, Hyderabad. I have B.Tech and M.tech in regular from JNTU Hyderabad. I have 11 Years of Teaching Experience for both B.Tech and M.Tech Courses.