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Tag Archives: Testing

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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Challenging Myself With Coplien’s Why Most Unit Testing is Waste

James O. Coplien has written in 2014 the thought-provoking essay Why Most Unit Testing is Waste and further elaborates the topic in his Segue. I love testing but I also value challenging my views to expand my understanding so it was a valuable read. When encountering something so controversial, it’s crucial to set aside one’s emotions and opinions and ask: “Provided ...

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Testing System.in and System.out with system-rules

Writing unit tests is an integral part of software development. One problem you have to solve when your class under test interacts with the operating system, is to simulate its behaviours. This can be done by using mocks instead of the real objects provided by the Java Runtime Environment (JRE). Libraries that support mocking for Java are for example mockito ...

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Separating Integration Tests from Unit Tests Using Maven Failsafe & JUnit @Category

Why Unit Tests Should Run Separately From Integration Tests TDD at the Unit Testing level is fairly straight-forward, since classes in unit testing either do not have complex dependencies, or you mock-out the dependencies with a mocking framework (ex. Mockito). However, TDD quickly becomes difficult when we get to Integration Testing. Integration Testing is basically testing a component with some or all ...

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Given When Then in Java

tl;dr you can use labels to clarify a given-when-then style of testing. What is given-when-then? given-when-then is a commonly used style of specifying system behaviour in which your tests are split into three sections. Given is the section that lays out the pre-conditions for the test, ie whatever state you’re assuming the world to be in before you start. The ...

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