Define Boundary Testing in brief.

Boundary Testing

This is one of the types of black box testing. This testing is use to define the size and rang of the input and output values. Boundary value analysis is a type of black box testing technique and used to detect the errors at boundaries of input values rather than finding those errors in the center of input values.
Finding defects using this test design technique is very effective and it can use at all test levels. You can select number of test cases from valid data and invalid data based on your needs or previous experience but remember you need to select at least one test case from each input domain.

Example: if a function expects all values in range of negative 200 to positive 2000, test inputs would include negative 201 and positive 2001.

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