We test it / Software testing guide

Partitioning and equivalence testing are both techniques used in software testing to ensure that the software behaves as expected under various conditions. Here’s a brief comparison:

Partitioning

Partitioning involves dividing the input data of a software program into partitions of equivalent data from which test cases can be derived. The idea is to reduce the number of test cases to a manageable level while still maintaining reasonable test coverage. The main types of partitioning are:

1. Equivalence Partitioning (EP): This is a black-box testing technique that divides the input data into partitions or classes where the data is expected to behave similarly. Each partition represents a set of valid or invalid states, and only one test case from each partition is chosen to test the software.
2. Boundary Value Analysis (BVA): Often used in conjunction with equivalence partitioning, BVA focuses on the boundaries between partitions. The idea is that errors often occur at the boundaries rather than within the partitions, so tests are created for the values at the edges of each partition.

Equivalence Testing

Equivalence testing is essentially the application of equivalence partitioning. It involves identifying sets of inputs that are treated equivalently by the system, meaning they should produce the same output or behavior. Test cases are then created for each equivalence class. The main focus is on:

1. Valid Equivalence Classes: These include sets of inputs that are expected to be processed correctly by the software.
2. Invalid Equivalence Classes: These cover inputs that are outside the expected range or format and should be handled appropriately by the software, typically by generating an error message.

Comparison

• Objective:
  • Partitioning: Divides the input space to manage test cases efficiently.
  • Equivalence Testing: Focuses on testing representative values from each partition.
• Techniques:
  • Partitioning: Includes equivalence partitioning and boundary value analysis.
  • Equivalence Testing: Primarily uses equivalence partitioning to identify and test representative values.
• Approach:
  • Partitioning: Both an analytical and design approach to organizing test data.
  • Equivalence Testing: A practical application of partitioning to generate test cases.

In summary, equivalence testing is a specific implementation of the partitioning technique where test cases are derived from equivalence classes. Both methods aim to reduce the number of test cases while ensuring adequate coverage to detect defects in the software.