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Tag Archives: JUnit

Parameterized Test Runner in JUnit

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We all have written unit tests where in a single test tests for different possible input-output combinations. Lets look how its done by taking a simple fibonacci series example. The below code computes the fibonacci series for number of elements mentioned:             import java.math.BigInteger; import java.util.ArrayList; import java.util.List; public class Fibonacci{ public List<Integer> getFiboSeries(int numberOfElements) ...

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This is Stuff: jUnit: Dynamic Tests Generation

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Dynamic tests generation is useful when you need to run the same set of tests on many different input values or configurations. It can be achieved either using parametrized tests or using theories. Theories are valuable when you have a bunch of data to be used as parameters and want to run tests on all their combinations. You get less ...

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JUnit in a Nutshell: Hello World

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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

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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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JUnit in a Nutshell: Test Structure

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Despite the existence of books and articles about JUnit testing, I still meet quite often programmers, who at most have a vague understanding of the tool and its proper usage. Hence I had the idea to write a multi-part tutorial, that explains the essentials from my point of view. Maybe the hands-on approach taken in this mini-series might be appropriate ...

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Clean JUnit Throwable-Tests with Java 8 Lambdas

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Recently I was involved in a short online discussion on twitter and google+ which concerned the question why the arrival of Java 8 Lambda expressions makes the catch-exception library1 obsolete. This was triggered by a brief announcement that the library won’t be longer maintained as lambdas will make it redundant. The answer I came up with at that time has ...

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A JUnit Rule to Run a Test in Its Own Thread

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Occasionally it would be helpful to be able to run a JUnit test in a separate thread. In particular when writing integration tests that interact with encapsulated ThreadLocals or the like this could come in handy. A separate thread would implicitly ensure that the thread related reference of the threadlocal is uninitialized for each test run. This post introduces a ...

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JUnit: testing exception with Java 8 and Lambda Expressions

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In JUnit there are many ways of testing exceptions in test code, including try-catch idiom, JUnit @Rule, with catch-exception library. As of Java 8 we have another way of dealing with exceptions: with lambda expressions. In this short blog post I will demonstrate a simple example how one can utilize the power of Java 8 and lambda expressions to test ...

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Writing Clean Tests – Divide and Conquer

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A good unit test should fail for only one reason. This means that a proper unit test tests only one logical concept. If we want to write clean tests, we have to identify those logical concepts, and write only one test case per logical concept. This blog post describes how we can identify the logical concepts found from our tests, ...

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