Skip to main content

TDD

Test Driven Development

  • The importance of writing tests
    • They force the developer to think of the class design
    • They provide a safety harness while refactoring
    • They ensure that the state of code is always stable
    • New developers can make changes comfortable with the knowledge that if they break something that was working, the tests will inform them
    • Test after development is not the same as test first development. Test after development does not reap all the benefits of test first development
  • Writing the tests
    • Think about the class it’s responsibilities and it’s API
    • Write the tests to test every method and various conditions in the methods
    • Whenever you think of writing a print statement or generate a log, it might be a scenario to include a test
    • Write enough production code to ensure that the tests compile and fail
    • Write production code to pass all tests one by one, while also ensuring that previous tests do not fail
  • What not to test
    • Database entities need not be tested
    • Do not go overboard with tests. First write tests that are most likely to fail. Think of the cost benefit ratio while writing tests
  • The test class
    • Tests classes end with the work Test. The test class for Account will be AccountTest
    • Test methods begin with the word test. The test method for creditAccount() will be testcreditAccount()
    • Tests can either exist in a different source tree in the same package as the class they are testing, or in the same source tree, but in a different package.
  • Managing dependencies
    • Unit tests should ideally not have any dependencies
    • Dependencies can be eliminated with mock objects (so that units can be tested in isolation)
  • AllTests
    • There should have one class AllTests that will run the entire test suite

    Requirements (Java Unit Tests):

    • JUnit 3.8 for JDK 1.4 and before
    • JUnit 4.x for JDK 1.5 and after
    • StrutsTestCase for testing Struts Action classes

    References:



Notes: This text was originally posted on my earlier blog at http://www.adaptivelearningonline.net
Labels:

Comments

Aditi said…
Very nice insight on TDD.
11:12 AM
Parag said…
Thanks Aditi
11:54 AM
Post a Comment

Popular posts from this blog

Five Reasons Why Your Product Needs an Awesome User Guide

Photo Credit: Peter Merholz ( Creative Commons 2.0 SA License ) A user guide is essentially a book-length document containing instructions for installing, using or troubleshooting a hardware or software product. A user guide can be very brief - for example, only 10 or 20 pages or it can be a full-length book of 200 pages or more. -- prismnet.com As engineers, we give a lot of importance to product design, architecture, code quality, and UX. However, when it comes to the user manual, we often only manage to pay lip service. This is not good. A usable manual is as important as usable software because it is the first line of help for the user and the first line of customer service for the organization. Any organization that prides itself on great customer service must have an awesome user manual for the product. In the spirit of listicles - here are at least five reasons why you should have an awesome user manual! Enhance User Satisfaction In my fourteen years as a
Post a Comment
Read more

Inheritance vs. composition depending on how much is same and how much differs

I am reading the excellent Django book right now. In the 4th chapter on Django templates , there is an example of includes and inheritance in Django templates. Without going into details about Django templates, the include is very similar to composition where we can include the text of another template for evaluation. Inheritance in Django templates works in a way similar to object inheritance. Django templates can specify certain blocks which can be redefined in subtemplates. The subtemplates use the rest of the parent template as is. Now we have all learned that inheritance is used when we have a is-a relationship between classes, and composition is used when we have a contains-a relationship. This is absolutely right, but while reading about Django templates, I just realized another pattern in these relationships. This is really simple and perhaps many of you may have already have had this insight... We use inheritance when we want to allow reuse of the bulk of one object in other
3 comments
Read more

Planning a User Guide - Part 3/5 - Co-ordinate the Team

Photo by  Helloquence  on  Unsplash This is the third post in a series of five posts on how to plan a user guide. In the first post , I wrote about how to conduct an audience analysis and the second post discussed how to define the overall scope of the manual. Once the overall scope of the user guide is defined, the next step is to coordinate the team that will work on creating the manual. A typical team will consist of the following roles. Many of these roles will be fulfilled by freelancers since they are one-off or intermittent work engagements. At the end of the article, I have provided a list of websites where you can find good freelancers. Creative Artist You'll need to work with a creative artist to design the cover page and any other images for the user guide. Most small to mid-sized companies don't have a dedicated creative artist on their rolls. But that's not a problem. There are several freelancing websites where you can work with great creative ar
Post a Comment
Read more