12. Software Testing

Question 1

Reasons for testing

Answer 1

1. detect defects
2. support design and implementation
3. prevent introduction of defects
4. document behaviour of system
5. demonstrate system meets specification

Question 2

testing concepts

Answer 2

interface
- expected service of a system

failures
- deviation from expected system behaviour

defects
- causes failure of system

slips
- actions by programmers that introduces defects

Question 3

scales of test

Answer 3

1. unit test
2. integration test
3. acceptance test

Question 4

test terminologies

Answer 4

test case
- set of actions to be performed on software with an expected outcome

test
- execution of a test case

testing
- practice of creating, maintaining, evaluating test cases

Question 5

defects testing

Answer 5

goal
- discover defects to be rectified

derived from
- architecture and design documents

Question 6

acceptance testing

Answer 6

goals
- demonstrate system meets requirements

derived from
- requirement specification

Question 7

behavioural driven development

Answer 7

derive test cases from a collection of user stories and scenarios

user story
scenario
steps
step functions
API
implementation

Question 8

mapping steps in test case

Answer 8

scenario
GIVEN –> how to setup test

WHEN –> actions to take during test

THEN –> assertions to be made and output at the end of the test

Question 9

Good practices for BDD

Answer 9

1. keep scenarios short
2. have individual step short
3. comply with GWT pattern
4. write features in user domain language
5. use frameworks sot reduce redundancy
6. develop feature and implementation gradually
7. work with customers to validate features

Question 10

limitation of BDD

Answer 10

1. specification by example which needs many examples
2. philosophy makes abstraction difficult
3. need to maintain steps definitions as features changes
4. hard coding of dependencies
5. only one level of abstraction possible with gherkin
6. gherkin steps sequential so all combinations have to be expressed