What is the purpose of the equivalent partitioning method in testing?

The equivalent partitioning method is used to reduce the number of test cases while maintaining sufficient test coverage.

The essence of the method:

1. Input data or conditions are analyzed.
2. Data or conditions are divided into equivalence classes.
3. One or more representative values are selected from each class for testing data.

Principle: If a test case detects an error using one value from a class, then other values from the same class are likely to also cause an error or behave similarly. Conversely, if a test case does not detect an error, then other values are also unlikely to do so.

Goal: To cover the maximum number of scenarios with the minimum number of tests, saving time and resources on testing. It is used at the test design stage for functional testing.