Today I held a mock dojo (one and a half hour) in order to introduce mocking and JMock to my audience. This post is intended to be the first. Too hard to test things that involve external components? • Too slow, even if you could? • Unit Tests as much fun as smacking yourself in the head with a. Here is a tutorial about using JUnit and EasyMock (a mocking library I personally find far easier to use than JMock).

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By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. I’m trying to learn how to write tests. And most articles I found was about test driven development, write tests first then write code to make the test pass.

I’m not looking for that at the moment, I’m trying to write tests for already existing code with jMock. The official documentation is vague to say the least and just too hard for me. Does anybody have better way to learn this. It passes the test and basically does nothing, what I wanted is to create a map and check its size, and you know work some variations try to get a jmocl on this.

Understand better trough examples, what else could I test here or any other exercises would help me a lot. The purpose of mocking is that when you test Class Awhich depends on B and Cyour test of A uses mock versions of B and C to be able to specify their exact behavior rather than using the real implementations of B tutodial C in your test of A.

Otherwise you are not testing just the single unit of Ayou are implicitly testing B and C as well. Just start with the basics and get it working. Once you start to experience difficulties with scale and growing a design, come back to the technique.

JMockit – Tutorial – Introduction

The Dave Astels book is still ttuorial good introduction and the only one, I think, of that generation that jmmock mocks well.


You don’t need really mock to test this class as its only collaborator is a Map which you might as well just use as is. Also your class doesn’t really do anything except delegate which jmoxk why you feel like you are not testing much. A straight test might be I’m assuming you are using JUnit 4 — your code is an odd mixture of JUnit 3 and 4.

In both cases you setup the system by setting the map to have the properties you want to test and then check that the cache has the same properties as it is a straight delegate.

I would recommend you read about JUnit before you continue. I nmock know how far you’ve gone down the path to learning about using mock objects in testing, so I’ll write a brief description then point you in the direction of an article that may be helpful to you.

Mock objects are used in unit testing to replace external dependencies that are difficult to create or difficult to get into the state you want them for your test. The various mocking frameworks that exist give you mechanisms to create “fake” objects that take the place of these dependencies. These mock objects will keep track of calls coming into them from your code and allow you to make assertions about these interactions later. There’s a well known article about mock objects and how they relate to “stubs”, another common testing strategy for simplifying external dependencies.

It was written by Martin Fowler and can be found here:. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy jmok and cookie policyand that your continued use of the website is subject to these policies. How to get started with testing jMock Ask Question. London 5, 29 93 Not an answere but: I would recommend to learn how to write tests before looking into mocks.

Mocks are an advanced topic in testing, you should master the basics first.

jMock 1: Getting Started

Arne can you give me concrete tutoroal what are considered to be basics? I’m a quick learner, not saying that I’m smarter than other people just I’m eager to learn and have plenty time on my hands. You can write your tests wiithout a mocking framework. Just use JUnit to write your tests. If you are testing your code fluently and jmofk encounter a case you can not master without a mock, try a mocking framework.


The need for a mock should be the exception, not the rule. Some libraries have support for mocking classes and not just interfaces Umock 3. Mocking shines when your classes express dependencies on each other by depending on an interface and not a concrete class. After that, you might ahem consider ours, “Growing Object Jmocck Software, Guided by Tests” Discount anyone who tells you it’s all about making tests against the file system go faster.

Steve Freeman 2, 14 Kathy Van Stone It was written by Martin Fowler and can be found here: Rob Heiser 2, 1 13 No, mocking is done at the thtorial level, so the mocking framework will handle creating the “proxy” i. Keep in mind that this object doesn’t implement the behavior of the object it’s mocking. It’s purpose is jmick keep track of interactions with it and let you verify these interactions happened as you expected them to. I wouldn’t recommend the mocks aren’t stubs article any more.

Our understanding has grown quite a bit since then. Sign up or log in Sign up using Google.

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