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Tag Archives: JUnit

Writing Clean Tests – Beware of Magic

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It is pretty hard to figure out a good definition for clean code because everyone of us has our own definition for the word clean. However, there is one definition which seems to be universal: Clean code is easy to read. This might come as a surprise to some of you, but I think that this definition applies to test ...

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Yet another way to handle exceptions in JUnit: catch-exception

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There are many ways of handling exceptions in JUnit (3 ways of handling exceptions in JUnit. Which one to choose?, JUnit ExpectedException rule: beyond basics). In this post I will introduce catch-exception library that I was recommended to give a try. In short, catch-exceptions is a library that catches exceptions in a single line of code and makes them available ...

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JUnit ExpectedException rule: beyond basics

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There are different ways of handling exceptions in JUnit tests. As I wrote in one of my previous posts, my preferable way is using org.junit.rules.ExpectedException rule. Basically, rules are used as an alternative (or an addition) to methods annotated with org.junit.Before, org.junit.After, org.junit.BeforeClass, or org.junit.AfterClass, but they are more powerful, and more easily shared between projects and classes. In this ...

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Getting JUnit Test Names Right

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Finding good names is one of the challanges of crafting software. And you need to find them all the time and for everything – classes, methods, variables, just to name a few. But what makes a name a good name? To quote Oncle Bob: ‘Three things: Readability, readability, and readability!’ Which he defines later one by clarity, simplicity and density ...

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Parameterized JUnit tests

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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

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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

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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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