Equivalence partitioning and boundary value analysis in Software Engineering - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is equivalence partitioning in software testing?

Equivalence partitioning is a testing technique that divides input data into groups where test cases from each group are expected to behave similarly. It helps reduce the number of test cases while covering all possible scenarios.

beginner

Explain boundary value analysis (BVA).

Boundary value analysis tests the values at the edges of input ranges because errors often happen at these boundaries. It focuses on minimum, maximum, just inside/outside boundaries to catch edge case bugs.

intermediate

Why do testers use equivalence partitioning and boundary value analysis together?

Testers combine these techniques to efficiently cover input scenarios. Equivalence partitioning reduces test cases by grouping inputs, while boundary value analysis ensures edge cases are tested where bugs often occur.

beginner

Give an example of equivalence partitions for an input field accepting ages 18 to 60.

Partitions could be: invalid low (below 18), valid (18 to 60), and invalid high (above 60). Each group represents inputs expected to behave the same way in the system.

beginner

What test inputs would boundary value analysis suggest for the age range 18 to 60?

Test inputs would be 17 (just below min), 18 (min), 19 (just above min), 59 (just below max), 60 (max), and 61 (just above max). These check behavior at and near boundaries.

What is the main goal of equivalence partitioning?

A To test the software's performance under load

B To test only the maximum input value

C To reduce the number of test cases by grouping similar inputs

D To write code for input validation

Equivalence partitioning groups inputs that should behave the same, reducing test cases while covering scenarios.

Which values are most important in boundary value analysis?

A Values at and near the edges of input ranges

B Only the minimum value

C Random values inside the input range

D Only invalid inputs

Boundary value analysis focuses on edge values because errors often occur there.

If an input accepts numbers 1 to 100, which is NOT a boundary value test input?

A 1

B 50

C 100

D 0

50 is inside the range but not near a boundary; boundary tests focus on edges like 1, 100, and just outside values like 0.

How many equivalence partitions are there for an input that accepts values 10 to 20?

A 1

B 2

C 4

D 3

There are three partitions: below 10 (invalid), 10 to 20 (valid), above 20 (invalid).

Why is boundary value analysis effective in finding bugs?

A Because developers often make mistakes at input limits

B Because it tests all possible inputs

C Because it ignores invalid inputs

D Because it only tests valid inputs

Errors frequently happen at boundaries, so testing these values catches common bugs.

Describe how you would apply equivalence partitioning and boundary value analysis to test a form field that accepts numbers from 1 to 50.

Think about grouping inputs and testing edges.

Explain why combining equivalence partitioning and boundary value analysis improves test coverage and efficiency.

Consider how each technique complements the other.