Start with the scariest feature - how to prioritise what to test

location_city Virtual Platform schedule Sep 11th 03:15 - 03:35 PM IST place Online Meeting 2 people 41 Interested

It can be intimidating for inexperienced teams embarking on their test automation journey for an existing code base. There is so much to test, and so many ways to test. I often see teams stuck with debating on where to start and what tools to use and best practices:

"We should start from unit tests"

"No, integration tests are better!"

"Should we use tool A or tool B?"

I see this play out all the time, and I've been there before. And the worst that could happen is decision paralysis and inaction.

The bigger question really is "What to test?".

My rule of thumb is "Start with the scariest code". I'll share with you my framework for evaluating the ROI of writing a test for a feature and prioritising what to test.

 
 

Outline/Structure of the Talk

[20 min] Start with the scariest feature:

  • [15 min] Picking a place to start
    • [3 min] A Problem-First process (Identifying what to test -> Technique selection -> Tool selection) vs. a Layered-approached (Unit test everything -> Some integration tests -> Some end-to-end tests, or in-reverse)
      • I often meet inexperienced teams stuck debating on which tests to write based on the Testing Pyramid. My advice is to change the focus of discussion from How to test to What to test first. In the next sections, I cover how to identity What to test - your scary code, followed by How to test.
    • [12 min] How to spot scary features
      • e.g. nested loops, layers of conditionals, things that you dread refactoring, legacy systems, undocumented systems, critical paths
      • Some people use intuition to identity scary code, but we can use a weight-based framework to rate the ROI of test automation for a feature based:
        • based on business impact if the feature fails
        • based on how frequently the feature is used
          • We can also use analytics to find out which pages / forms / buttons users frequently interact with
        • based on number of user stories / edge cases for a feature
          • e.g. modules that involve a lot of calculations and conditionals like billing
        • based on the level of domain expertise required to understand how a feature works
          • e.g. if testing a feature like tax filing requires an explanation of how tax works in country X, then it should really be automated sooner than later.
        • based on difficulty of performing the test by hand
          • e.g. if testing a feature requires filling 50 input fields
  • [5 min] Questions

Learning Outcome

Audience learns a framework for prioritising what tests to automate.

Target Audience

Beginners

Video


schedule Submitted 3 years ago

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