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Tag Archives: Testing

Writing Clean Tests – Small Is Beautiful

We have learned that “clean” unit tests might not be as clean as we think. We have done our best to make our unit tests as clean as possible. Our tests are formatted properly, use domain-specific language, and avoid excessive mocking. Nevertheless, our unit tests are not clean because:           When we make changes to the ...

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Writing Clean Tests – Trouble in Paradise

If our code has obvious faults, we are very motivated to improve it. However, at some point we decide that our code is “good enough” and move on. Typically this happens when we think that the benefits of improving our existing code are smaller than the required work. Of course, if we underestimate our return of investment, we can make ...

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Testing Interface Invariants

Today’s article is something a little special. It’s the first article where I use code from my current personal project for examples. You will be getting “real world” examples and not silly, made-up examples like my Scientist and Pen example in my factories article. My Project Because of this, I’m going to make a quick introduction to what the project ...

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Nifty JUnit : Using Rule on Method and Class level

As shown in a the post Nifty JUnit : Working with temporary files, it is possible to use @Rule in a JUnit test, which is a Method level Rule. In this example I would like to show the variation of the @ClassRule for a Class level Rule. Method Rule The @Rule is fired before each test method (just like @Before) ...

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Using junit for something else

junit != unit test Junit is the Java unit testing framework. We use it for unit testing usually, but many times we use it to execute integration tests as well. The major difference is that unit tests test individual units, while integration tests test how the different classes work together. This way integration tests cover longer execution chain. This means ...

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Refactoring to Allow Test Doubles

Sometimes, when you make a class, it directly instantiates an object to use in its methods. For example:                   public void myFunc() { MyType object = new MyType(); object.doSomething(); this.thingy = object.getSomething(); } This is generally viewed as bad, since you’re tightly coupling your class to the instantiated one. “But,” you say, ...

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Unit Test, System Test, Red Test, Green Test

We tend to categorize different types of tests according to what they cover. Unit tests cover small portions of code, usually a method or a class, while we mock the rest of their interaction. Integration tests cover several components in concert, and then mock the other boundaries. System tests and their bigger brothers, End-to-End tests cover more and more. Those ...

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Stress testing the OIM web (UI) layer


The default configuration in Oracle IDM reserves 20 threads dedicated for serving front end (UI) requests. This basically means that the application server has a pool of 20 threads which it can utilize to serve users who are accessing OIM via the web console (/identity or /sysadmin). In case of Weblogic, this is how it is configured:       ...

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Do not unit test bugs

Before getting to the topic of the title let’s have a simple programming sample. On the programming task I will demonstrate some bad coding style and based on that it will be easier for me to explain why the same style is bad in unit tests. Well, now that I wrote this sentence this seems to be a obvious statement. ...

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