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Tag Archives: JUnit

Parameterized JUnit tests

Sometimes you encounter a problem that just screams for using “parameterized” tests rather than copy/pasting the same method many times.   The test method is basically the same and the only thing that changes is the data passed in.  In this case, consider creating a test case that utilitizes the ” Parameterized” class from JUnit. I recently ran into a ...

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Testing for expected exceptions in JUnit

Unit tests are used to verify that a piece of code operates as the developer expects it to. Sometimes, that means checking that the code throws expected exceptions too. JUnit is the standard for unit testing in Java and provides several mechanisms for verifying exceptions were thrown. This article explores the options and their relative merits.   Take the following ...

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Access private fields in unit tests

First of all, let me say out louder, you need to design your code to be testable, so you test your private fields through your public methods. But, (“buts” are the reasons why humans are still programming instead of the computer itself, so be happy here) sometimes you want to and should alter some private fields in order to test ...

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More Units with MoreUnit

Just over a year ago I wrote a post about working with JUnit in Eclipse. One of the commenters recommended MoreUnit in order to increase testing efficiency even more. Giving it a try I was delighted and the plugin’s keyboard shortcuts were immediately memorized by my autonomic nervous system… Additionally after using MoreUnit for a while I recognized a slight ...

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Introduction To JUnit Theories

Have you ever read a mathematical theory? It typically reads something like this: For all a, b > 0  the following is true: a+b > a and a+b > b Just typically the statements are more difficult to understand. There is something interesting about this kind of statement: It holds for EVERY element (or combination of elements) of a rather ...

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Parameterized JUnit tests with JUnitParams

Parameterized unit tests are used to to test the same code under different conditions. Thanks to parameterized unit tests we can set up a test method that retrieves data from some data source. This data source can be a collection of test data objects, external file or maybe even a database. The general idea is to make it easy to ...

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Run, JUnit! Run!!!

JUnit together with JavaScript and SVN are some of the technologies that programmers often start using without even reading a single blog post let alone a book.  Maybe this is a good thing since they look simple enough and understandable so we can use them right away without any manuals, but this also means that they are also underused. In ...

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JBoss Drools unit testing with junit-drools

Recently I’ve been working with a project heavily using JBoss Drools. I am not Drools expert – I am not also very convinced to this framework, or maybe only to particular use case in this project – and I found it quite difficult to write simple, maintainable unit tests for Drools based business rules. That’s how junit-drools was born – ...

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A JUnit Rule to Conditionally Ignore Tests

I always believed that using @Ignore to deactivate tests is a bad idea. Except, maybe as one way to put tests that fail intermittently into quarantine to attend to them later (as Martin Fowler describes it here). This bears the danger that the test suite decays as more and more tests keep getting ignored and forgotten. Therefore you should have ...

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