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Tag Archives: Testing

JUnit in a Nutshell: Test Isolation

Working as a consultant I still meet quite often programmers, who have at most a vague understanding of JUnit and its proper usage. This gave me the idea to write a multi-part tutorial to explain the essentials from my point of view. Despite the existence of some good books and articles about testing with the tool, maybe the hands-on approach ...

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Writing Tests for Data Access Code – Data Matters

When we write tests for our data access code, we use datasets for two different purposes:                   We initialize our database into a known state before our data access tests are run. We verify that the correct changes are found from the database. These seem like easy tasks. However, it is very ...

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Why Testers Are Losing The ISO 29119 Battle

The ISO 29119 is making waves in the testing communities, regarding its content and necessity. Its focus on test planning and documentation gets modern testers to ask why. I’ve worked in an ISO certified company, so maybe I can shed light from my past experience.           ISO standards are written by committees, which are made of ...

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Unit Testing – Cost vs. Benefit

I have been a big fan of unit testing for a very long time; my blog is ridden with posts about it. If I look at how automated unit testing has progressed in my projects over the last decade I am noticing that the inclination to do unit testing is just not there. Recently, I came across this Podcast series between Martin Fowler, Kent ...

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Test Attribute #10 – Isolation

This is last, final, and 10th entry in the ten commandments of test attributes that started here. And you should read all of them. We usually talk about isolation in terms of mocking. Meaning, when we want to test our code, and the code has dependencies, we use mocking to fake those dependencies, and allow us to test the code ...

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JUnit in a Nutshell: Hello World

JUnit seems to be the most popular testing tool for developers within the Java world. So it is no wonder that there have been written some good books about this topic. But by earning a living as consultant I still meet quite often programmers, who at most have a vague understanding of the tool and its proper usage. Hence I ...

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Understanding JUnit’s Runner architecture

Some weeks ago I started creating a small JUnit Runner (Oleaster) that allows you to use the Jasmine way of writing unit tests in JUnit. I learned that creating custom JUnit Runners is actually quite simple. In this post I want to show you how JUnit Runners work internally and how you can use custom Runners to modify the test ...

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Test Attribute #9 – Deterministic

I keep hammering on trust and how it’s crucial that we trust our tests. If a test is deterministic, it raises the level of our trust.  If it isn’t, we may question its result, which will be followed by questioning other tests as well. Let’s start with a simple example. What’s wrong with this picture?           ...

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Writing Clean Tests – To Verify Or Not To Verify


When we write unit tests that use mock objects, we follow these steps:                     Configure the behavior of our mock objects. Invoke the tested method. Verify that the correct methods of our mock objects were invoked. The description of the third step is actually a bit misleading, because often we end ...

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