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Tag Archives: JUnit

JUnit and Mockito cooperation

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This time I want to make an overview of testing framework Mockito. Definitely this is one of the most popular tools for the testing of java code. I have already made the overview of the Mockito’s competitor – EasyMock. This post will be based on the sample application from the post about EasyMock. I mean classes which represent coffee machine ...

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Fault Injection with Byteman and JUnit

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The time when our applications lived in isolation have passed long-long ago. Nowadays applications are a very complicated beasts talking to each other using myriads of APIs and protocols, storing data in traditional or NoSQL databases, sending messages and events over the wire … How often did you think about what will happen if, for example, a database goes down ...

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Running JUnit Tests Repeatedly Without Loops

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Recently I came across a problem where I had to write tests for a method that calculates randomly distributed values within a certain range of possibilities 1. More precisely if you assume a signature that looks like                 interface RandomRangeValueCalculator { long calculateRangeValue( long center, long radius ); } a test might verify ...

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JUnit: Naming Individual Test Cases in a Parameterized Test

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A couple of years ago I wrote about JUnit Parameterized Tests. One of the things I didn’t like about them was that JUnit named the invidividual test cases using numbers, so if they failed you had no idea which test parameters caused the failure. The following Eclipse screenshot will show you what I mean:             ...

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JUnit and EasyMock cooperation

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Developers always need to take care about code which they produced. They should be ensured that code works properly after a new feature was implemented or some bug was fixed. That’s can be achieved at least with the help of unit tests. Since this blog is dedicated to Java programming language, today I will write the article about JUnit 4.1 ...

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Testing Expected Exceptions with JUnit Rules

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This post shows how to test for expected exceptions using JUnit. Let’s start with the following class that we wish to test:                   public class Person { private final String name; private final int age; /** * Creates a person with the specified name and age. * * @param name the name ...

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Don’t rely on unit tests alone

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When you are building a complex system, barely testing components in isolation is not enough. It’s crucial, but not enough. Imagine a car factory that manufactures and imports highest quality parts, but after assembling the vehicle never starts the engine. If your test case suite consists barely of unit tests, you can never be sure that the system as a ...

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Hamcrest Containing Matchers

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The Hamcrest 1.3 Javadoc documentation for the Matchers class adds more documentation for several of that class’s methods than were available in Hamcrest 1.2. For example, the four overloaded contains methods have more descriptive Javadoc documentation as shown in the two comparison screen snapshots shown next.               Although one can figure out how the ...

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JUnit test method ordering

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Junit until version 4.10 uses the order of test methods in a test class as returned by the reflection API as the order of test method execution - Class.getMethods(). To quote the Javadoc of getMethods() api: The elements in the array returned are not sorted and are not in any particular order. thus the order of test method execution in ...

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Using Builder Pattern in JUnit tests

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This is not intended to be a heavily technical post. The goal of this post is to give you some guidelines to make your JUnit testing life more easy, to enable you to write complex scenarios for tests in minutes with the bonus of having extremely readable tests.                 There are two major ...

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