May 2017
Intermediate to advanced
370 pages
8h 6m
English
Content preview from Spock: Up and Running
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Chapter 3. Spock Assertions
In Chapter 2, you learned that any Boolean expression in a then: block or expect: block is treated as an assertion.
In this chapter, we examine assertions in depth.
You will learn about various techniques for writing concise and expressive assertions using Groovy’s enhancements to the core Java APIs.
We also discuss the importance of good diagnostics in your Spock specifications and how to structure assertions to provide the most information in case of a failure.
I have three goals when writing assertions in tests. Listed most important first, they are:
- Good diagnostics
-
If the assertion fails I should be able to see very easily in the test report what exactly is wrong. I don’t want a generic exception or a poorly worded message that doesn’t really tell me anything beyond “something is wrong.”
- Expressiveness
-
When I look at the test, I want to be able to see right away what is being asserted without having to scratch my head over convoluted code. When I introduce a regression, I want to be able to determine whether the test I have broken is still valid or is now obsolete due to the change I am implementing.
- Conciseness
-
This is related to expressiveness in that the shorter a piece of code is, the easier it is to read. However, there’s a point beyond which brevity comes at the cost of comprehensibility. Short is good but not when it begins to resemble an obfuscated code contest entry!
The Importance of Good Diagnostics
If you’ve practiced or read ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.