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2 Why We Need Model-Based Testing

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182 <strong>Model</strong>ing Systems with Structured State<br />

2. An object graph is a directed, possibly cyclic, graph that arises from relations<br />

among values. For example, the instance fields of objects in an object-oriented<br />

program represent an object graph. How can a cyclic object graph be represented<br />

using the data types described in this chapter?<br />

3. Extend the repository control system to account for forking. Forking divides the<br />

source files of the repository into independently updated branches.<br />

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