Week 8 & 9 Flashcards
In a Use Case we describe?
How a system will respond to a given scenario?
Use case is?
User-oriented
What does user-oriented mean?
We specify the actions done by the user
The actors see in a system
What SW testing level is a use case testing?
Unit testing
What are the 2 main steps when writing testing for use cases?
- Write test cases for normal flow
2. Write exceptions test cases
Sunny day use cases?
Primarily cases that are most likely to happen, where everything goes well (normal flow)
Rainy day use cases?
Edge cases
Take priority after sunny day use cases
White Box testing should cover?
Statement coverage
Control flow testing
Path & Basis path coverage
Branch coverage
What is Statement Coverage?
Execution of all executable statements in the source code atleast once
Which SW testing technique is statement coverage?
White box testing technique
Why use Statement Coverage?
To calculate the number of source code statements which can be executed
Statement Coverage formula?
(# of executed statements/total # of statements) * 100
What is covered by Statement Coverage?
Unused statements
Unused branches
Dead code
What is NOT covered by Statement Coverage?
Missing statements in the source code
How can we identify missing code statements?
Control Flow Coverage
Cons of Statement Coverage?
Expensive in time and money required
Doesn’t reveal missing code or statements
Pros of Statement Coverage?
Identifies unused code
Identifies unused branches
Identifies dead code
Control Flow depicts a program as?
Graph
What does Control Flow graph contain?
Nodes and Edges
What is a node?
Represents an indivisible group if code statements
What is the purpose of edge?
Connects 2 nodes
* If the 2nd statement might be executed immediately after the 1st statement
What is Path Testing?
Also called structural testing
Execute every path atleast once
Is Path Testing challenging and time consuming and why?
It is time consuming
Testing each point is challenging and time consuming
How to reduce the challenges and time required to perform Path Testing?
Reduce redundant tests
Achieve maximum test coverage
By using basis path testing
Basis Path Coverage?
Executes every path at least once
Basis Path Coverage is the same as path testing except?
It defines test cases based on the flow or logical paths that can be taken
Independent path has at least one edge not traversed before in any other paths
How is basis path coverage different from path coverage?
Achieves maximum path coverage with least number of test cases
What is Cyclometric Complexity?
A metric determining the number of paths
Independent path has?
At least one edge not traversed before in any other paths
Basis Set?
A set of all independent paths of a program
Cyclometric Complexity can be calculated with respect to?
Functions
Modules
Methods
Classes
How to reduce cyclomatic complexity?
Limit the complexity of routines during development
Cyclomatic Complexity number 1-10 meaning?
Structured & well written code
High testability
Cost and Effort is less
Cyclomatic Complexity number 10-20 meaning?
Complex code
Medium testability
Cost and effort is medium
Cyclomatic Complexity number 20-40 meaning?
Very complex code
Low Testability
Cost and effort are high
Cyclomatic Complexity number >40 meaning?
Not at all testable
Very high cost and effort
Basis Path Testing guarantees execution of atleast?
One statement during testing
Basis Path Testing benefits?
Helps to reduce the redundant tests
Focuses attention on program logic
Helps facilitate analytical vs arbitrary test case design
100% Path coverage implies?
100% Branch Coverage
100% Path coverage implies?
100% Statement coverage
Branch Coverage?
Excecute all branches
- Branches are outgoing edges of a decision point
Covers missing statements
Branch Coverage function?
BC = (# of executed branches/total number of branches)
100% branch coverage implies?
100% statement coverage
