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Presentation developed for JSChannel BLR :: Meetup 8 - Unit testing AngularJS using Jasmine and Karma
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JAVASCRIPT UNIT TESTINGPulak (@pulakb) http://www.pulakonline.com
What is unit testing?
What is unit testing?
A unit test is an automated piece of code that invokes a unit of work in the system and then checks a single assumption about the behavior of that unit of work.
What is unit testing?
A unit of work is a single logical functional use case in the system that can be invoked by some public interface (in most cases).
A unit of work can span a single method, a whole class or multiple classes working together to achieve one single logical purpose that can be verified.
How to define good unit test?
How to define good unit test?
Automated
Repeatable Fast
Incremental
Easy to run
Easy to understand
GOOD UNIT TEST
Why we need unit testing?
Why we need unit testing?
Highly stable solution
Integration of different components will be easier
New and regression defects can be minimized
Good unit testing reduces the test cycle for each phrase
Good unit testing can be a good reference for the system documentation
Test-Driven Development
Test-Driven Development
Write test cases for a specific part of your code
Write your code to ‘fill in’ the tests. Your code only serves to make all of your tests pass, and nothing more
Once all your tests pass, go back and clean your code (Refactoring)
TDD gives developers the power to think clearly about the specifications before they engage themselves with implementations.
Test-Driven Development
Writing a failing test case
Run the test, Fail?
Write application code
Run the tests,
Success?
Refactor?
Refactor the code
Yes
Yes
Yes
No
No
No
Behavior-Driven Development
Write application code first.
Test cases must be small and tests one thing. Test a small unit of code instead of the entire application
Run test cases against class or method specific for that test case
If test fails, fix the defects and test again
With BDD, you can write specifications that are small and easy to read.
Behavior-Driven Development
Write class(es) or method(s)
Write unit tests
Run the tests, Fail?
Refactor?
Refactor the code
No
Yes
No
Fix the defects
Yes
What is Jasmine?
What is Jasmine?
Jasmine is a behavior-driven testing framework for JavaScript programming language.
It does not depend on any other JavaScript frameworks. It does not require a DOM.
http://jasmine.github.io/ http://jasmine.github.io/1.3/introduction.htmlhttp://jasmine.github.io/2.0/introduction.html https://github.com/pivotal/jasmine/tree/master/dist
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