Mastering Test-Driven Development and Private Method Testing with JUnit
This lecture provides an in-depth exploration of Test-Driven Development (TDD) using JUnit, a robust testing framework for Java. Discover the principles of TDD, its benefits, and practical steps for implementation. Learn how to effectively test private methods through reflection, ensuring code quality and meeting testing standards. This session is part of a CSE 4000 Independent Study Course focusing on practical issues in software engineering. Gain the knowledge needed to leverage TDD for better software development practices.
Mastering Test-Driven Development and Private Method Testing with JUnit
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Presentation Transcript
Test Driven Developmentand Testing Private Methods using JUnit By: Taylor Helsper
Outline • Introduction • Test Driven Development • JUnit • Testing Private Methods • TDD Example • Conclusion
Introduction • 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 Note: The products discussed in this presentation are examples used for teaching purposes and are not endorsements of the products.
Outline • Introduction • Test Driven Development • JUnit • Testing Private Methods • TDD Example • Conclusion
Test Driven Development • 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 http://en.wikipedia.org/wiki/Test-driven_development
Outline • Introduction • Test Driven Development • JUnit • Testing Private Methods • TDD Example • Conclusion
JUnit • 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 Examples • A JUnit Test Case
JUnit Examples • JUnit Before/ After
Outline • Introduction • Test Driven Development • JUnit • Testing Private Methods • TDD Example • Conclusion
Testing Private Methods • 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
Outline • Introduction • Test Driven Development • JUnit • TDD Example • Conclusion
TDD Example • Math Class for a Calculator Program • Steps • Generate Tests • Code • Run Tests • Repeat
Conclusion • Test Driven Development is important to understand • TDD is useful in many circumstances • TDD • Saves Money • Is Agile • Offers Good Metrics
References • 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.
