Introduction of unit test to management

Introduction of Unit Test to
Management and Business
August, 2012
Wei Li

”To err is human;
to forgive, divine.”
Alexander Pope

 Developer Test
– Unit Test
– Integration Test
– Regression Test
 QA Test
– Integration Test
– Regression Test
– Performance Test
– Stress Test
 Customer/User Test
– Acceptability Test
– Usability Test
Many Tests in the Life Cycle of Software Development

What is Unit Test
 Self checking or validation to ensure the code work as expected
 Developer’s test
 Part of construction cycle
 Foundation of all other tests

Where Does Unit Test Fit in Life Cycle?
 Requirement gathering
 Business Design
 Technical Design
– Architecture Design
– Technical Design
 Construction
– Code and Unit Test
 QA Test
 Performance Test
 User Test

Unit Test Is Not
 QA test
 Customer/user test

Why?
 What? Write code to test code?
 No! I don’t have time for it!

Benefits of Unit Test – Instant Feedback
 Unit test provides the earliest opportunity to identify and fix a defect
 The earlier an error is found, the less expensive it is to fix it
 Performed before components are integrated together

 Force the developer to write clean and testable code – which leads
to less complexity and better design
 If your code is hard to be tested, how can it be easily used,
maintained and extended?
Benefits of Unit Test – Write Testable Code

Benefits of Unit Test – Establish Safety Net in the Lifecycle
 Can be used as part of regression test suite
 Provide the green light to refactor old code and make changes

Benefits of Unit Test – Good Way to Work with Legacy/Existing Code
 Write unit test to get started understanding legacy code and system

Benefits of Unit Test – Excellent Way to Learn New Language and API
 Write unit test cases to learn and try new API
 The unit test cases can become reusable knowledge base

Benefits of Unit Test – Excellent Way to Report a Defect
 Write a unit test case to report a defect or a bug in the system
 Run the same test to verify the defect is fixed

Benefits of Unit Test - Reusability
 Write once run forever – reusable and repeatable
 Save time long term in the life cycle
 Give new team member a good jump start

Unit Test Practice
 Planning and estimation - account for the construction time
for unit test
 Code a little and unit test a little - repeat the cycle until the
construction is done
 Part of the code review process
 Run unit test when trouble shooting issues
 Run unit test whenever a change is made
 Run unit test whenever is needed
 Enjoy the results

 Our old friend JUnit is still our best friend
– No new wheel was reinvented
– De facto tool
– Familiarity to most developers
Unit Test Practice

 Use a separate unit test project
– Only contain unit test related Java code but test code in other projects
– Run locally and not deployed to application server
 Won’t be part of the deployable to application server
– Freedom to write more unit tests
– Save time in testing (no build and deployment)
Unit Test Practice

 Unit test coverage – the thorough the better
Unit Test Practice

 Just do it and it will become a habit
 You will find out you actually have time to write unit test code
 You will find out you actually enjoy doing it
Unit Test Practice

Test Driven/Test First Methodology
 Write a test case for a new functionality
 Run the test and it fails
 Write just enough code to make the test pass
 Run the test and it passes
 Refactor the code to make it better
 Repeat the test
 Repeat the cycle

Continuous Integration
 Get the latest version of the code from source control system
 Build/compile the code
 Run all unit test cases
 Publish the build and test results
 Notify the development team for any failure
 Repeat the process periodically, for example, once every hour

”To err is developer;
to catch early, unit
test.”

Introduction of unit test to management

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