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Tag Archives: Testing

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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Synchronising Multithreaded Integration Tests

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Testing threads is hard, very hard and this makes writing good integration tests for multithreaded systems under test… hard. This is because in JUnit there’s no built in synchronisation between the test code, the object under test and any threads. This means that problems usually arise when you have to write a test for a method that creates and runs ...

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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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Spring Selenium Tests With Annotations

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This post describes how to implement Selenium tests in Java. It is inspired from the post by Alex Collins, with annotations. The code is available on GitHub in the Spring-Selenium-Test directory. Some alternative and much lighter techniques are available to unit test a Spring MVC application. To unit test services, see here.               Page, ...

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The Differences Between Test-First Programming and Test-Driven Development

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There seems to be some confusion between Test-First Programming and Test-Driven Development (TDD). This post explains that merely writing the tests before the code doesn’t necessarily make it TDD.             Similarities Between Test-First Programming and Test-Driven Development It’s not hard to see why people would confuse the two, since they have many things in common. ...

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Waiting for the right moment – in integration testing

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When you have to test multi-threaded programs, there is always the need to wait until the system arrives at a particular state, at which point the test can verify that the proper state has been reached. The usual way to do it is to insert a ‘probe’ in the system which will signal a synchronization primitive (like a Semaphore) and ...

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A Selenium/WebDriver example in Java

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A couple of years back, I was pitching for some work and the client wanted to see how I would tackle a real world problem. They asked me to automate some tasks on the woot.com web site. The task was to go to various woot web sites and to read the product name and price of the offer of the ...

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