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Test Driven Development
and Testing Private Methods using JUnit
By: Taylor Helsper
Introduction
Test Driven Development
JUnit
Testing Private Methods
TDD Example
Conclusion
Outline
What is this lecture?◦ Part of a CSE 4000 Independent Study Course
◦ “Practical Issues in Software Engineering”
What’s the point?◦ To provide practical information to students in
Software Engineering topics
Introduction
Note: The products discussed in this presentation are examples used for teaching purposes and are not endorsements of the products.
Introduction
Test Driven Development
JUnit
Testing Private Methods
TDD Example
Conclusion
Outline
What is it?
◦ Development/Testing process where tests are generated before the development
◦ Development is completed based on the tests
Test Driven Development
Why is it useful?
◦ Distinct Steps
◦ Good Metrics
◦ Ensures Completion Based on Requirements/Design
Test Driven Development
Why is it useful?
◦ Only necessary features are implemented
◦ Short Development Lifecycle
◦ Easy to Accommodate Changes
Test Driven Development
Steps
◦ Write tests based on design / requirements
◦ Write code
◦ Run tests
◦ Repeat until all tests pass
Test Driven Development
Test Driven Development
http://en.wikipedia.org/wiki/Test-driven_development
Introduction
Test Driven Development
JUnit
Testing Private Methods
TDD Example
Conclusion
Outline
What is it?
◦ JUnit is a testing framework for Java
◦ It allows programmers to write test cases for Java classes
JUnit
Why use it?
◦ Repeatability
◦ Metrics / Measurement
◦ Easy Integration
JUnit
A JUnit Test Case
JUnit Examples
JUnit Before/ After
JUnit Examples
Introduction
Test Driven Development
JUnit
Testing Private Methods
TDD Example
Conclusion
Outline
Why?
◦ Better Tests
◦ Higher Probability Errors are Found
◦ Meet Regulations
Testing Standards
Code Coverage
Testing Private Methods
How?
◦ Use Reflection
◦ Java classes know info about themselves
Functions
Variables
Testing Private Methods
Java Example
◦ Get Private Access
Testing Private Methods
Java Example
◦ Test Private Method
Testing Private Methods
Introduction
Test Driven Development
JUnit
TDD Example
Conclusion
Outline
Math Class for a Calculator Program
Steps
◦ Generate Tests
◦ Code
◦ Run Tests
◦ Repeat
TDD Example
Test Driven Development is important to understand
TDD is useful in many circumstances
TDD◦ Saves Money◦ Is Agile◦ Offers Good Metrics
Conclusion
Junit - http://www.junit.org/
Netbeans – http://netbeans.org/
JUnit Examples - http://junit.sourceforge.net/doc/cookbook/cookbook.htm
MSU Classes and work experience
Stack Overflow for Reflection Code - http://stackoverflow.com/questions/34571/whats-the-best-way-of-unit-testing-private-methods
Real’s How To for Reflection Code - http://www.rgagnon.com/javadetails/java-0031.html
“Subverting Java Access Protection for Unit Testing” by Ross Burton. 11/12/2003. onjava.com.
References
Questions?
