The table above contains three different business rules, and one of them is the “withdrawal is granted if the requested amount is covered by the balance.” It is normal to create at least one test case per column, which results in full coverage of all business rules. Each column in the table corresponds to a rule in the business logic that describes the unique combination of circumstances that will result in the actions. In a decision table, conditions are usually expressed as true (T) or false (F). A decision table makes the same requirements clearer to understand: Already, this simple example of a business rule is quite complicated to describe in text. One of the business rules for the ATM is that the ATM machine pays out the amount if the customer has sufficient funds in their account or if the customer has the credit granted.
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