1

Test Cases

CSSE 376, Software Quality Assurance

Rose-Hulman Institute of Technology

March 13, 2007

2

Outline

Test design process Developing test cases

3

Test Design Process

1. Design tests elaborate test plan based on requirements

2. Develop test cases based on knowledge of system behavior

3. Verify test cases verify procedures debug test cases

4

1. Design Tests

Define test objectives what, not how based on requirements

Define input specifications files, databases not keyboard or mouse input

5

1. Design Tests (continued)

Define test configuration for each test operating system version network configuration

Review test designs for coverage and accuracy all requirements covered? all inputs identified? all configurations identified?

6

2. Develop Test Cases

Develop detailed test procedures use black-box techniques like equivalence

partitioning and boundary value analysis specify actions and expected results

Define test setup and cleanup, noting inter-case dependencies restart computer at start of testing reset system to known configuration at

start of each test

7

Equivalence Partitioning

Divide the input into independent categories (partitions) use the requirements specification consider type of each input

Select a value from each category Why is this a good idea?

8

Cartoon of the Day (1/2)

9

Cartoon of the Day (2/2)

10

Boundary Value Analysis

For each input partition identified earlier: pick values on the boundary pick values on each side of the

boundary Why is this a good idea?

11

3. Verify Test Cases

Review test procedures are the inputs unambiguous? are the outputs unambiguous?

Debug test cases (during first run) run the test as specified note flaws in test case as well as

flaws in software

12

Summary: Test Design Process

1. Design tests elaborate test plan based on requirements

2. Develop test cases based on knowledge of system behavior

3. Verify test cases verify procedures debug test cases