Equivalence Partitioning and Boundary Value testing

Boundary testing 

Boundary testing is the process of testing between extreme ends or boundaries between partitions of the input values. 

• So, these extreme ends like Start- End, Lower- Upper, Maximum-Minimum, Just Inside-Just Outside values are called boundary values and the testing is called “boundary testing”. 
• The basic idea in normal boundary value testing is to select input variable values at their: 

1. Minimum 

2. Just above the minimum 

3. A nominal value 

4. Just below the maximum 

5. Maximum 

• In Boundary Testing, Equivalence Class Partitioning plays a good role 
• Boundary Testing comes after the Equivalence Class Partitioning. 

Equivalence Partitioning 
 

Equivalence Partitioning or Equivalence Class Partitioning is type of black box testing technique which can be applied to all levels of software testing like unit, integration, system, etc. In this technique, input data units are divided into equivalent partitions that can be used to derive test cases which reduces time required for testing because of small number of test cases. 

• It divides the input data of software into different equivalence data classes. 
• You can apply this technique, where there is a range in the input field.