Part 2: W04-2 Functional Testing

Question 1

What is the Test Selection Problem?

Answer 1

Selecting a set of tests to reveal all failures in program

Question 2

What are some test generation techniques?

Answer 2

1. Equivalent Partitioning
2. Boundary Value Analysis
3. Decision Tables

Question 3

What are the steps of equivalence partitioning?

Answer 3

1. Start with set of all behaviours of system
2. Identify behaviours that adhere to quality requirement
3. Split behaviours into disjoint subdomains by quality requirements
4. Assume subdomain has same behaviour on all inputs
5. Make a tests using inputs from each subdomain (equivalence class)

Question 4

What are the objectives of equivalence partitioning?

Answer 4

• coverage completeness

- avoiding redundant tests

Question 5

What are the testing strategies?

Explain using
inputs: A,B,C
and states: A1,A2,A3,B1,B2,B3,B4,C1,C2

Answer 5

Fault Assumption
1. Weak equivalent class -
have at least one test with each input
# of tests is 4 because B has input domain 4
2. Strong equivalent class - try every combination of inputs
# of tests is 342 = 24

Selection

1. Robust selection strategy - split inputs into valid and invalid / test inputs on both sides of edge
2. Normal - teset all classes of valid values

Question 6

What is the effectiveness equation for equivalence testing?

Answer 6

effectiveness = # failures exposed by tests / total # of existing failures